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  • Iran  (2,794)
  • freshwater environment  (607)
  • 2020-2022  (3,401)
  • 1
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    Different patterns of uptake and depuration of cadmium by periphyton community and a grazer species (Physa sp.): A mesocosm evalution (2021)
    In:  http://aquaticcommons.org/id/eprint/4720 | 1256 | 2011-09-29 15:59:01 | 4720 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-05
    Description: Widespread pollution by heavy metals generated by various industries has serious adverse effects on human health and the environment. Cadmium is a heavy metal recognised as one of the most hazardous environmental pollutants. It is a non-essential and non-beneficial element to organisms, causing toxicity and other deleterious effects on various components of the aquatic environment. The ability of algal periphyton to concentrate cadmium from fresh water is well known. Moreover, periphyton communities are able to accumulate large amounts of cadmium despite its low concentration in fresh water. Many researchers use algal periphyton as an indicator of water quality in aquatic environments. In the present study, the authors ask two basic questions: Does cadmium accumulate along a food chain consisting of the periphyton community and a grazer species (Physa sp.) under semi-natural conditions provided by artificial streams? If not, which one can better indicate the water quality?
    Keywords: Biology ; Ecology ; Limnology ; Periphyton ; Cadmium ; Rivers ; Experimental research ; Bioaccumulation ; Chemical pollution ; Iran ; Kermanshah
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  • 2
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    Efecto de la radiación ultravioleta sobre los ecosistemas acuáticos (2021)
    In:  http://aquaticcommons.org/id/eprint/16701 | 9602 | 2016-05-04 14:16:51 | 16701 | Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
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    Publication Date: 2021-07-08
    Description: Hasta hace poco tiempo se consideraba que la radiación ultravioleta carecía de importancia como factor ambiental en los ecosistemas acuáticos, ya que se suponía que se absorbía totalmente en los primeros centímetros de la columna de agua. Gracias al desarrollo de mejores instrumentos de medición, hoy se sabe que la penetración de la radiación ultravioleta en el agua es mucho mayor que la estimada anteriormente, y que sus efectos biológicos resultan observables hasta decenas de metros de profundidad. Este artículo de divulgación científica incluye, además de lecturas sugeridas, información del ozono estratosférico y troposférico, y sobre factores que afectan la intensidad de la radiación ultravioleta que llega a la superficie terrestre.
    Description: Reprinted as: pp.41-47 in, Ciencia del Mar. Volumen temático 1, 12/2014; Asociación Ciencia Hoy. ISBN: 978-987-45584-0-4 (Special issue dedicated to 'Marine Sciences: 1988-2014')
    Keywords: Biology ; Conservation ; Ecology ; Environment ; Pollution ; PSW ; Argentina ; freshwater environment ; marine environment ; ultraviolet radiation ; ozone ; ecosystems
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  • 3
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    Die Leitfähigkeit des Fischkörpers (2021)
    In:  sf@vti.bund.de | http://aquaticcommons.org/id/eprint/7905 | 1240 | 2012-02-16 12:46:06 | 7905 | Bundesforschungsanstalt für Fischerei
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    Publication Date: 2021-06-26
    Description: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Keywords: Biology ; Fisheries ; electric effects ; fish behaviour ; electric field ; physical effects ; freshwater environment
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    Format: 77-78
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  • 4
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    Pototan: Going for native catfish (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20048 | 2002 | 2016-03-04 15:19:32 | 20048 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-07
    Keywords: Aquaculture ; Clarias macrocephalus ; Philippines ; Panay I. ; Iloilo ; Pototan ; freshwater environment ; Aquaculture development ; Endemic species ; Fish culture ; Freshwater aquaculture ; Freshwater fish
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  • 5
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    State of Philippine coastal fisheries (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20128 | 2002 | 2016-03-04 14:35:22 | 20128 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Fisheries ; Philippines ; brackishwater environment ; freshwater environment ; marine environment ; Coastal fisheries ; Coastal zone management ; Environmental degradation ; Fishermen ; Fishery development ; Fishery management ; Fishery regulations ; Illegal fishing ; Overfishing ; Policies ; Resource conservation ; Resource management ; Restoration ; Socioeconomic aspects ; Sociological aspects
    Repository Name: AquaDocs
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  • 6
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    Family farms in Vietnam (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20151 | 2002 | 2016-03-04 14:17:50 | 20151 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Aquaculture ; Vietnam ; freshwater environment ; Agropisciculture ; Aquaculture development ; Aquaculture economics ; Aquaculture techniques ; Brackishwater aquaculture ; Fish culture ; Freshwater aquaculture ; Mangroves ; Pond culture ; Rice field aquaculture ; Rice fields ; Small scale aquaculture ; Shrimp culture ; Yield
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  • 7
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    Facing the challenges in aquaculture through biotechnology (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/19961 | 2002 | 2016-02-25 19:21:02 | 19961 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-06
    Keywords: Aquaculture ; Biology ; Health ; brackishwater environment ; freshwater environment ; marine environment ; aquaculture development ; biotechnology ; disease detection ; DNA ; genetically modified organisms ; GMO ; genetics ; genomes ; immunity
    Repository Name: AquaDocs
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    Format: pp. 17, 20
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  • 8
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    Growth and yield of Asian catfish Clarias macrocephalus (Gunther) fed different grow-out diets (2021)
    In:  aqdchief@seafdec.org.ph | http://aquaticcommons.org/id/eprint/19953 | 2002 | 2016-02-23 22:45:44 | 19953 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-06
    Keywords: Aquaculture ; Clarias macrocephalus ; Philippines ; freshwater environment ; aquaculture economics ; biochemical composition ; culture effects ; diets ; feasibility ; feed ; feed composition ; feeding experiments ; feed efficiency ; feeding ; freshwater aquaculture ; freshwater fish ; sediment properties ; pond culture ; taste tests ; water quality ; yield
    Repository Name: AquaDocs
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  • 9
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    Laguna de Bay and LLDA (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20042 | 2002 | 2016-03-04 16:30:05 | 20042 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-07
    Keywords: Fisheries ; Aquaculture ; Aristichthys nobilis ; Philippines ; Luzon I. ; Laguna de Bay L. ; freshwater environment ; Cage culture ; Catch/effort ; Fisheries ; Freshwater aquaculture ; Freshwater fish ; Freshwater lakes ; Livelihoods ; Resource management ; Sociological aspects
    Repository Name: AquaDocs
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    Format: 32
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  • 10
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    The practice of carp hatchery technology around Laguna de Bay (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20038 | 2002 | 2016-03-04 16:32:54 | 20038 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-07
    Keywords: Aquaculture ; Aristichthys nobilis ; Philippines ; Luzon I. ; Laguna de Bay L. ; freshwater environment ; Aquaculture development ; Aquaculture economics ; Brood stocks ; Freshwater fish ; Freshwater aquaculture ; Freshwater lakes ; Fry ; Fingerlings ; Hatcheries ; Induced breeding ; Introduced species ; Lake fisheries ; Seed (aquaculture) ; Seed production ; Socioeconomic aspects
    Repository Name: AquaDocs
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  • 11
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    Center promotes land-based carp culture (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20043 | 2002 | 2016-03-04 16:29:37 | 20043 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-07
    Keywords: Aquaculture ; Aristichthys nobilis ; Philippines ; Luzon I. ; Laguna de Bay L. ; freshwater environment ; Aquaculture development ; Aquaculture economics ; Aquaculture techniques ; Brood stocks ; Freshwater fish ; Freshwater aquaculture ; Fry ; Fingerlings ; Gene pool ; Hatcheries ; Research institutions ; Seed (aquaculture) ; Seed production ; Socioeconomic aspects ; Sociological aspects
    Repository Name: AquaDocs
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  • 12
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    Bighead carp grow-out in Laguna de Bay (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20041 | 2002 | 2016-03-04 16:30:31 | 20041 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-07
    Keywords: Aquaculture ; Aristichthys nobilis ; Philippines ; Luzon I. ; Laguna de Bay L. ; freshwater environment ; Aquaculture economics ; Fingerlings ; Fish culture ; Freshwater aquaculture ; Freshwater lakes ; Freshwater fish ; Fry ; Cage culture ; Technology transfer
    Repository Name: AquaDocs
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  • 13
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    Checklist of species for cage/pen culture (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20119 | 2002 | 2016-03-04 14:39:27 | 20119 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-07
    Keywords: Aquaculture ; brackishwater environment ; freshwater environment ; marine environment ; Aquaculture techniques ; Cage culture ; Cages ; Check lists ; Cultured organisms ; Fish culture
    Repository Name: AquaDocs
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    Format: pp.12-13, 29
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  • 14
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    Backyard fish farming (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20124 | 2002 | 2016-03-04 14:36:57 | 20124 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Aquaculture ; brackishwater environment ; freshwater environment ; Brackishwater aquaculture ; Construction ; Fish culture ; Freshwater aquaculture ; Small scale aquaculture
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  • 15
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    Nature parks for environment education and biodiversity in the Philippines (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20142 | 2002 | 2016-03-04 14:23:05 | 20142 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Conservation ; Philippines ; Philippines ; brackishwater environment ; freshwater environment ; marine environment ; Biodiversity ; Education ; Environmental protection ; Marine parks ; Nature conservation ; Potential resources ; Protected areas ; Resource conservation
    Repository Name: AquaDocs
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    Format: pp.8-9, 26
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  • 16
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    Museums, gardens, zoos, and wildlife breeding centers in the Philippines (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20148 | 2002 | 2016-03-04 14:19:30 | 20148 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Conservation ; Philippines ; Philippines ; brackishwater environment ; freshwater environment ; marine environment ; Aquaria ; Biodiversity ; Biological institutions ; Breeding ; Education ; Environmental protection ; Marine parks ; Museums ; Nature conservation ; Research institutions
    Repository Name: AquaDocs
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    Format: pp.9-10, 32
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  • 17
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    Seabass grow-out and marketing: lessons from Australia, Malaysia, and Thailand (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20150 | 2002 | 2016-03-04 14:18:25 | 20150 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Aquaculture ; Management ; Lates calcarifer ; Malaysia ; Thailand ; Australia ; brackishwater environment ; freshwater environment ; marine environment ; Aquaculture economics ; Aquaculture techniques ; Cage culture ; Costs ; Euryhalinity ; Feed ; Feeding ; Fingerlings ; Fish culture ; Floating cages ; Freshwater aquaculture ; Harvesting ; Marine aquaculture ; Marketing ; Pond culture ; Stocking density ; Water management
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  • 18
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    The seabass market (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/20149 | 2002 | 2016-03-04 14:18:53 | 20149 | Southeast Asian Fisheries Development Center, Aquaculture Department
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    Publication Date: 2021-07-08
    Keywords: Fisheries ; Lates calcarifer ; brackishwater environment ; freshwater environment ; marine environment ; Aquaculture economics ; Aquaculture techniques ; Aquaculture products ; Consumers ; Euryhalinity ; Fish culture ; Costs ; Fishery products ; Marketing ; Trade
    Repository Name: AquaDocs
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    Format: pp.25-26, 31
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  • 19
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    Cymo andreossyi (2021)
    Tehran University, Kish International Campus
    In:  http://aquaticcommons.org/id/eprint/21028 | 17408 | 2018-08-20 05:43:30 | 21028 | Tehran University, Kish International Campus, Kish Island, Iran
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    Publication Date: 2021-07-13
    Keywords: Biology ; Fisheries ; Cymo andreossyi ; Persian Gulf ; Iran
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  • 20
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    Effect of age on reproductive performance in female Caspian brown trout (Salmo trutta caspious, Kessler 1877) (2021)
    In:  http://aquaticcommons.org/id/eprint/21695 | 18721 | 2017-11-27 11:56:25 | 21695 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-06-28
    Description: Caspian brown trout (Salmo trutta caspius) is one of the economically valuable species in the Caspian Sea.Artificial propagation and production of larvae are the main problems in the early culture of this species.The purpose of this paper is to study the effect of reproductive performance of female broods on opposition reproduction efficiency in Caspian brown trout in the breeding season of 2009. Three groups of female broods (4, 5 and 6 years old) were fertilized with 9 male fish individually. The results showed that,6 year old females have maximum body weight (2150.0 ± 86.6 g), total length (59±2 cm), eggs weight (255.0 ± 30.51 g), egg size (5.37 ± 0.058 mm) and absolute fecundity rate (3060 ± 366.15), while highest average number of ovules in each gram of body weight (16.33 ± 0.58) and relative fecundity (2.08 ± 0.12) belonged to 4 years old females. There were significant differences in mean fertilization rate and survival rate until absorption of yolk sack stage (p〈0.05) among the treatments studied. The present study showed that the eggs produced from fertilization of 6 year old female eggs and male mixed milt showed maximum average fertilization percentage (97.5 %), survival rate until eyed stage (92%), hatching percentage (93%), and survival rate until absorption of yolk sack (94.5%).
    Keywords: Biology ; Fisheries ; age ; reproductive ; performance ; female ; Caspian Sea ; Salmo trutta caspious ; Iran ; larvae ; weight ; male
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  • 21
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    First report on freshwater crab species (Potamon bilobatum) in the altitudes of Guilan (Lakan area) (2021)
    In:  http://aquaticcommons.org/id/eprint/21701 | 18721 | 2017-11-27 12:19:48 | 21701 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-06-28
    Description: Guilan province is located in south and south-west of the Caspian Sea. Guilan is one of the richest and the most humid region in the country due to suitable climate, ample rainfall and many water sources (springs,rivers, creeks,..),. Despite the prevailing favorable conditions, limnological studies, especially in the mountainous regions of this province are limited. A limnological study was conducted in the Lakan area from March to June in 2008. Macrobenthos were sampled from the freshwater stream that were mostly composed of freshwater crabs. The samples were transported to the Natural History Museum in Frankfurt, Germany, and the crab species was identified as Potamon bilobatum belonging to Family Potamidae. The physico-chemical characteristics of water and the study area have been recorded.
    Keywords: Biology ; Fisheries ; first report ; freshwater ; crab ; species ; Potamon bilobatum ; Guilan ; Lakan area ; macrobenthos ; limnological ; Iran
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  • 22
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    Biomonitoring total mercury in the Persian Gulf using rock oyster, Saccostrea cucullata (2021)
    In:  http://aquaticcommons.org/id/eprint/21711 | 18721 | 2017-11-27 14:08:10 | 21711 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-06-29
    Description: This study is an attempt to evaluate the biomonitoring capabilities of rock oyster, Saccostrea cucullata, for mercury (Hg) pollution. The oyster and sediment samples were collected from 10 rocky habitats of Qeshm and Hormoz Islands in the Persian Gulf. The concentration of mercury in the shell and soft tissues of the oysters and sediments were analyzed using an advanced mercury analyzer. Biota-sediment accumulation factor (BSAF) was calculated based on the ratio of Hg concentrations in soft tissues to that in sediments.The results showed that the rate of mercury accumulation in the soft tissues of the oyster was significantly higher than that in its shell (P 〈 0.05). There was a significant correlation between mercury concentrations in the soft tissues and the sediments (r =0.75). According to BSAF, soft tissues of the oyster were recognized as an appropriate indicator for biomonitoring mercury. The present study generally supports the usability of soft tissue of S. cucullata as a sensitive biomonitoring organ to warn mercury pollution in the Persian Gulf.
    Keywords: Biology ; Fisheries ; Pollution ; biomonitoring ; mercury ; Persian Gulf ; rock oyster ; Saccostrea cucullata ; Iran ; pollution ; tissues
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  • 23
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    Effect of copper sulphate on behavioral and histopathological changes in roach, Rutilus rutilus caspicus (2021)
    In:  http://aquaticcommons.org/id/eprint/21734 | 18721 | 2017-11-28 08:59:37 | 21734 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-06-30
    Description: The research was accomplished in order to study behavioral and histopathological effects of Copper on Rutilus rutilus caspicus under experimental condition. The study was performed using Water Static Method during 96 hours. 15 fish with averaged weight 2±0.5 g in weight were encountered to different concentrations (0, 0.1, 0.2, 0.3, 0.4 mg/l) of Copper. A group of fish was considered as control. Under stable condition and aeration, the lethal concentration was 0.4 mg/l. Results indicated that there was significant differences between treatments when copper concentration increased (p〈0.05). It was found that in the high concentration of Copper nominal signs of toxicity such as convulsion, air gulping and flared operculum were observed. Histopathological sings were hyperplasia, edema, hyperemia, hemorrhage, expansion of Bowman’s capsule and hepatocytes necrosis. In control group no lesion was observed.
    Keywords: Biology ; Chemistry ; Fisheries ; copper ; sulphate ; behavioral ; histopathological ; Rutilus rutilus caspicus ; Caspian Sea ; Iran ; hyperplasia
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    Length-length, length-weight relationship and relative condition factor of pike, Esox lucius Linnaeus, 1758, in Anzali Wetland (Southwest of the Caspian Sea) (2021)
    In:  http://aquaticcommons.org/id/eprint/21737 | 18721 | 2017-11-30 03:25:09 | 21737 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-06-30
    Description: The length-length (LLRs), length-weight (LWR) relationships and relative condition factor (Kn) of 505 specimens of pike, (Esox lucius Linnaeus, 1798) from Anzali Wetland, southwest of the Caspian Sea, were studied from April 2012 through March 2013. The length-length relationships among total length (TL), fork length (FL) and standard length (SL) for pike were found to be highly significant (r2〉0.986, P〈0.001). The values of b in length-weight relationship in males (3.1495), females (3.1843) and for all specimens (3.2137) indicated isometric growth. Mean relative condition factor for male, female and all specimens were 1.003, 1.004 and 1.008 respectively. The result of LWR could be used for fishery managers to approve appropriate regulations for sustainable fishery management. Few studies have been conducted on these parameters of pike and this is the first report on LLRs, LWR and Kn of pike from Iranian waters.
    Keywords: Biology ; Fisheries ; length ; weight ; relationship ; relative ; condition ; pike ; Esox lucius ; Anzali wetland ; Caspian Sea ; Iran
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    Age determination and morphology of otolith in Alburnus chalcoides (Guldenstaedt, 1772) in the southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21742 | 18721 | 2017-11-30 03:27:22 | 21742 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-06-30
    Description: The aim of this study was to provide necessary information on the age, growth and sex ratio of one of commercially important cyprinid species, Alburnus chalcoides in the southern Caspian Sea (North of Iran) from 2010 through 2011. 53 specimens of both sexes (males and females) were collected monthly. The samples were transported to the laboratory for further biological measurements and otolith extraction. The maximum and minimum age of A. chalcoides was 4+(FL=26.0 cm) and 1+ (FL= 18.1 cm), respectively. The mean fork length of A. chalcoides was 20.21±0.287 cm; and the sex ratio was 1.00: 2.12. The calculated length-weight relationships for all individuals were as W=0.141TL2.199 (R2= 0.648). Different regressions were prepared between age and morphological measurements of fish and otolith, of which the highest correlation was between age and body length as a linear regression of TL=1.959Age+16.32 (r= 0.66). There was no significant correlation between morphometric measurements of otolith and fish morphological parameters (p〉 0.05), and an allometric growth was found with a slope of b=1.926 for the study area.
    Keywords: Biology ; Fisheries ; age ; determination ; morphology ; otolith ; Alburnus chalcoides ; Caspian Sea ; Iran ; sex ; growth ; morphometric
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    Environmental and strategic assessment of ecotourism potential in Anzali Wetland using SWOT analysis (2021)
    In:  http://aquaticcommons.org/id/eprint/21739 | 18721 | 2017-11-28 09:08:10 | 21739 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-30
    Description: SWOT analysis is used extensively as an assessment and planning method, particularly in tourism planning. However, there are little documentations on application of SWOT analysis in ecotourism. An assessment on systematic use of SWOT analysis was carried out in the present study to highlight the applicability of the SWOT technique in detailed investigations. In this study, based on field surveys and questionnaires (on Anzali Wetland and the local population), matrix of internal and external factors (threats, opportunities, weaknesses and strength) influencing tourism development in Anzali Wetland were evaluated within the framework of SWOT analysis and SO, WO, ST and WT strategies were identified. Based on the obtained results, the total score of 3.22 in IFE matrix suggests good condition of the system and high internal strength of the tourism development related to internal factors and the final score of 2.93 in the EFE matrix represents poor condition related to the external factors which means external factors have not been utilized properly; Thus appropriate planning and organizational management practices are required to deal with these factors. The study further proposes solutions, operational priorities and strategic planning according to environmental and local conditions of Anzali Wetland. Since the tourism industry in Iran is still in its early stages, particularly in Anzali Wetland region, the findings could help decision makers to estimate better the weaknesses, strengths, threats and opportunities, and to develop tourism industry in the region.
    Keywords: Environment ; Sociology ; environmental ; strategic ; assessment ; ecotourism ; potential ; Anzali wetland ; SWOT analysis ; Iran
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    The features of the feeding of Caspian marine shad, Alosa braschnikowii (Borodin, 1904) in western part of the Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21751 | 18721 | 2017-11-30 04:32:38 | 21751 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-30
    Description: Feeding habits of Caspian marine shad Alosa braschnikowii (Borodin, 1904), inhabiting in the western part of Caspian Sea such as prey spectrum and seasonal dynamics have been studied. As in other parts of Caspian Sea, throughout the year, the main hunt of Caspian marine shad constituted kilkas, gobies and shrimps while other groups of zoobenthos were represented in a lesser extent. Importance of other fishes and zoobenthos in the diet of Caspian marine shad is influenced by their ecological morpho-functional peculiarities. Seasonal changes of species composition and proportions of fodder food items are caused by life cycles of fishes and migrations of fodder entities. The changes of food composition depending length of fishes, the depth and haul region are analyzed. Caspian marine shad most intensively feeds in spring (March – April) before spawning and in summer (July) after spawning.
    Keywords: Biology ; Fisheries ; features ; feeding ; Alosa braschnikowi ; diet ; food ; zoobenthos ; gobies ; kilka ; Caspian sea ; Iran
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    Prevention of acute ammonia toxicity in beluga, Huso huso, using natural zeolite (2021)
    In:  http://aquaticcommons.org/id/eprint/21745 | 18721 | 2017-11-30 03:37:48 | 21745 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-30
    Description: This study was accomplished to examine the efficiency of natural zeolite in preventing acute toxicity of total ammonia to Huso huso. The study was performed using Water Static Method in 96 hours. Fish averaged 46 ± 5 g in weight and 22 ± 4 cm in total length were exposed to four different concentrations (15, 30, 50, 75 mgL-1) of ammonia and a group was considered as control. Under stable condition, the lethal concentration of ionized ammonia was 75 mgL-1 in 96 hours. In the lethal concentration of total ammonia, different amounts of 5, 10, 15 g.L-1 granulated clinoptilolite zeolite were used. Results indicated significant differences between treatments and control (p〈0.05). By increasing Clinoptilolite zeolite in each treatment, the survival rate of fish also increased significantly (p〈0.05). In lethal concentration of ammonia, the use of 15 g.L-1 zeolite could prevent the mortality rate. Histopathological findings showed that major lesions in gill filaments included hemorrhage, hyperemia, hyperplasia, epithelial cells necrosis. There were hemorrhage, hyperemia, degenerated tubules of kidney, expansion of Bowman's capsule in kidney and hepatocytes necrosis in liver.
    Keywords: Aquaculture ; Biology ; Chemistry ; Fisheries ; prevention ; ammonia ; toxicity ; beluga ; Huso huso ; zeolite ; Iran ; liver ; histopathology ; hyperemia ; hyperplasia
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    Effect of human chorionic gonadotropin on sexual maturation, sex steroids and thyroid hormone levels in Caspian lamprey (Caspiomyzon wagneri Kessler, 1870) (2021)
    In:  http://aquaticcommons.org/id/eprint/21790 | 18721 | 2017-12-03 15:17:24 | 21790 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: The objective of this study was to determine the effect of human chorionic gonadotropin (hCG) on sexual maturation, plasma sex steroids [17β-estradiol, (E2) and 17α-hydroxy progesterone (17α_OHP)] and thyroid hormones (triiodothyronine, T3 and thyroxin, T4) levels in upstream - migrating Caspian lamprey. During the experiment, 36 fish (24 females and 12 males) in spring 2013 and 36 fish (24 females and 12 males) in fall 2013 were collected from the Shirud River estuary in Mazandaran Province, the Southern Caspian Sea during their upstream migration to the freshwater. All fish were injected with hCG at the doses of 1000, 1500 and 2000 IU.kg BW-1. The injection was a two - step process (50% of hormone in each step) by 12 h interval. After the first injection, fish were retained in the cages in the river beds and 24 hours after the second injection, fish were checked for egg and sperm release after mild abdomen pressure. Blood samples were taken for determining sex steroid levels. Results showed that hCG hormone injections caused increase in migration of germinal vesicle in the oocyte of female and sperm release in males. Significant differences were found in the serum E2 and 17α-OHP levels in hCG - injected fish compared to the control. However, no significant differences were found in serum T3 and T4 levels in the hCG -injected fish. According to the results, the appropriate hCG dosage to induce the reproduction acceleration in Caspian lamprey is 1500-2000 IU.kg BW-1.
    Keywords: Biology ; Fisheries ; Lamprey ; Caspian Sea ; Induced reproduction ; Hormonal changes ; chorionic ; gonadotropin ; sexual ; maturation ; sex ; Caspiomyzon wagneri ; steroids ; hormone ; levels ; Iran ; Shirud River
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    Effects of pH, particle size and porosity of raw rice husk and its silica on removing lead and hexavalent chromium from aqueous solution (2021)
    In:  http://aquaticcommons.org/id/eprint/21791 | 18721 | 2017-12-03 15:20:17 | 21791 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: Adsorbent properties and aqueous characteristics are very important parameters in the removal efficiency (RE) of environmental pollutants. The main goal of this study was to investigate the effects of pH, particle size and porosity of raw rice husk and its silica on removing lead and hexavalent chromium (Cr+6) from aqueous solution. The raw rice husk was collected from north of Iran and the rice husk silica was prepared at 800ºC after acid leaching. The effects of the adsorbent particle sizes (0.07-0.1, 0.1-0.5, 0.5-1.0 and 1.0-1.5 mm), porosity and pH from 2 to 8 were investigated by varying any of the process variables while keeping the other variables constant (adsorbent dosage= 1.5 g.l-1, contact time = 60 min, chromium and lead initial concentration = 5 mg.l -1). The results of this study showed that the RE of Cr+6 is intensively pH - dependent. Using 1.5 g.l-1 adsorbents, particle size = 0.5 - 1.0 mm, 5.0 mg.l-1 initial concentration of Cr+6 and 60 min contact time, the maximum RE obtained by raw rice husk and its silica at pH 2 were up to 98.8 and 88.4%, respectively. However, at the same condition with changing pH (pH 7),the maximum RE decreased up to 69.4 and 60.4%, respectively. Moreover, a positive strong significant correlation was detected between decreasing the adsorbents particle sizes and lead removal efficiency in the two adsorbents (P 〈 0.01). The scanning electron microscope images of the two adsorbents showed that silica derived from raw rice husk has more porosity. In conclusion, the acidic condition of aqueous for Cr+6 and neutral condition for lead, increases the adsorbents porosity, while decreased adsorbent particle sizes causes an elevation in the RE of the two pollutants.
    Keywords: Environment ; Pollution ; Hexavalent chromium ; Lead ; Particle size ; Removal efficiency ; Rice husk silica ; pH ; particle size ; porosity ; chromium ; Iran
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    Toxicity comparison of silver nanoparticles synthesized by physical and chemical methods to tadpole (Rana ridibunda) (2021)
    In:  http://aquaticcommons.org/id/eprint/21765 | 18721 | 2017-11-30 07:11:15 | 21765 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: One of the possible threats in increasing use of nanomaterials is the emergence of toxicity in humans and other animals which is discussed in nanotoxicology. In addition to toxic effects of nanomaterials themselves, different chemical precursors which are usually used in bottom-up approaches for production of nanomaterials may have secondary toxic effects in living organisms. In contrast, less use of chemicals in top-down approaches may reduce these secondary effects. To test this hypothesis, toxic effects of two types of silver nanoparticles (AgNPs) produced by physical (top-down) and chemical (bottom-up) methods were investigated and compared on the tadpole, Rana ridibunda survival. The estimated 48 h LC50 values of AgNPs produced by chemical and physical methods for tadpoles were 0.055 ± 0.004 and 0.296 ± 0.085 mg.L-1, respectively. No observed effect concentration, lowest observed effect concentration, maximum acceptable toxicant concentration and median lethal concentration of AgNPs produced by chemical method were respectively 3.42, 4.50, 4.84 and 5.38 times less than those produced by physical method. Therefore, approving the mentioned hypothesis, it was revealed that AgNPs produced by chemical method are more toxic than those generated by physical method. However, it seems totally that AgNPs regardless of the method used for their production, have toxic effects on aquatic organisms and so, inhibiting their accidental or intentional entrance into the aquatic ecosystems should be more considered.
    Keywords: Biology ; Chemistry ; Environment ; Rana ridibunda ; Iran ; tadpole ; chemical ; methods ; physical ; toxicity ; comparison ; silver ; nanoparticles
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    Effects of dietary nucleotides levels on whole body composition of orange spotted grouper (Epinephelus coioides) (2021)
    In:  http://aquaticcommons.org/id/eprint/21796 | 18721 | 2018-01-08 09:08:45 | 21796 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-02
    Description: This research was carried out for 10 successive weeks (2 weeks for adaptation and 8 weeks for culture) in summer 2008 at Abzisytan Shrimp Hatchery Center in Bushehr province. The effects of dietary nucleotides at 5 levels including 0.0% (control), 0.15%, 0.25%, 0.35% and 0.5% on the growth performance and whole-body composition of Epinephelus coioides was investigated. Juvenile fish specimens with average weight of 10.70±0.29g were fed by experimental diets for 8 weeks. The trial was carried out in 300 liter fiberglass tanks. The highest protein content was observed in 0.15% diet nucleotide and the highest fat in 0.15% and 0.25% diet nucleotide which showed significant difference with the control group (P〈0.05). The highest and lowest ash content was observed in 0.15% and 0.35% nucleotide treatment, respectively. The ash content showed significant difference between 0.15%, 0.25% and 0.35% treatments and control group (P〈0.05). Also, the 0.35% treatment had the highest water content (P〈0.05). We conclude that at the level of 0.15% dietary nucleotide, better results are achieved in terms of whole-body composition.
    Keywords: Aquaculture ; Biology ; Muscle ; Food ; Growth ; Epinephelus coioides ; orange spotted grouper ; Epinephelus coioides ; Iran
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    Environmental geopolitics of the Caspian basin energy interactions (2021)
    In:  http://aquaticcommons.org/id/eprint/21775 | 18721 | 2017-11-30 07:53:44 | 21775 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: Following the collapse of the Soviet Union and the discovery of gas and oil in Central Asia and Caucasia, it faced complex interests in the international political economy. These problems were mainly rooted in developing plans of the countries for increasing their influence in the area and also in Russia's connections with the Iranian and Turkish governments in the region. This paper investigates the Caspian Sea oil resources and the related systems of oil transmission through a descriptive-analytical method. Moreover, it studies the role of these factors in regional interactions of the Caspian coastal states. Finally, it analyzes the environmental geopolitics of the Caspian Sea, in association with the oil pollutants and the policies of Islamic Republic of Iran. The results revealed that the new routes of oil transmission and interactional active role of all costal states in environment conservation may have a key role in the regional constructive interactions among the Caspian coastal states.
    Keywords: Engineering ; Environment ; Policies ; Pollution ; Caspian Sea ; oil resources ; regional interactions ; oil transmission routes ; environment geopolitics ; Iran ; energy
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    Spermatological parameters of wild and cultured beluga (Huso huso Linnaeus, 1758) and their effects on fertilization rate, hatching rate, larval growth and survival rates (2021)
    In:  http://aquaticcommons.org/id/eprint/21779 | 18721 | 2017-12-03 14:56:39 | 21779 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: To compare the reproductive performance of the wild and cultured stocks of beluga, Huso huso males, some spermatological parameters were measured including: sperm motility, sperm density, spermatocrit and also fertilization rate, hatching rate and larval growth and survival rates. The semen samples were sampled from 11 wild spawners and 12 cultured brooders. A half of each semen sample was allocated for spermatological analysis and remaining were used for artificial propagation. In wild beluga, sperm motility time was 339.09 ± 23.11 s; spermatozoa motility rate 83.64 ± 2.01%; sperm density 15.22 ± 3.46 ×109 and spermatocrit 5.88 ± 1.36% while in cultured beluga, sperm motility time was 199.35 ± 29.02 s; spermatozoa motility rate 74.22 ± 2.4 %; sperm density 8.37 ± 0.24 × 109 and spermatocrit 3.21 ± 0.29 %. The fertilization rate (%), hatching rate (%), larval growth (% g.day-1), and survival rate (%) in wild beluga were 61.72 ± 14.16, 43.33 ± 11.13, 12.28 ± 0.33 and 52.66 ± 7.77, while in cultured beluga were 49.98 ± 6.55, 31.47 ± 8.49, 12.28 ± 0.62 and 57.37 ± 7.89, respectively. The spermatozoa motility (the ratio and duration of motility) were significantly different between wild and cultured brooders (P〈0.05). The values of sperm density, spermatocrit, fertilization rate, hatching rate, larval growth and survival rate were not significantly different between wild and cultured beluga (P〉 0.05).
    Keywords: Aquaculture ; Biology ; Fisheries ; Sperm density ; Sperm motility ; Growth rate ; Survival rate ; Beluga ; Huso huso ; parameters ; fertilization ; Iran
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    Changes in biochemical and physiological responses of common carp, Cyprinus carpio L. after long-term exposure to Pb (II) (2021)
    In:  http://aquaticcommons.org/id/eprint/21781 | 18721 | 2017-12-03 15:00:24 | 21781 | University of Guilan, Faculty of Natural Resources, Iran
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    Publication Date: 2021-07-01
    Description: In this study, the chronic toxic effects of Pb (II) on common carp, Cyprius carpio were investigated using several biomarkers at different levels of biological functions for assessing changes in ecosystem quality. In a bioassay,common carp juveniles were individually exposed to different dose of heavy metal, Pb II (0, 0.45, 0.89, 1.34 mg.l-1) for 28 days. Morphological indices such as hepatosomatic index, condition factor and lipid peroxidation (LPO) level and also the activities of superoxide dismutase (SOD) and catalase (CAT) were measured. These results indicated that there was significant lower condition factor in fish exposed to the highest concentration of Pb (p〈0.05). The activity of hepatic antioxidant enzymes (SOD & CAT) and LPO level was significantly elevated after long-term exposure to higher concentration of Pb (p〈0.05). Briefly, our findings suggested that common carp exposed to lead, develop oxidative stress, hence long-term exposure to higher concentrations of Pb could seriously affect the health status of fish.
    Keywords: Biology ; Fisheries ; Cyprius carpio ; Pb ; Lipid peroxidation ; Oxidative stress ; Morphological indices ; biochemical ; physiological ; Morphological ; Iran
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    Amino acid and fatty acid profiles of materials recovered from Prussian carp, Carassius gibelio (Bloch, 1782), using acidic and basic solubilization/ precipitation technique (2021)
    In:  http://aquaticcommons.org/id/eprint/21792 | 18721 | 2017-12-03 15:21:35 | 21792 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: Isoelectric solubilization /precipitation (ISP) process was used to isolate protein from muscles of Prussian carp,Carassius gibelio (Bloch, 1782). Fish protein and lipid were recovered from whole gutted Prussian carp using acidic and basic isoelectric solubilization/precipitation followed by assaying amino acid and fatty acid profile. Essential amino acids content in acidic and basic pH treatment of ISP of Prussian carp were 216.6 and 218.7 mg.g-1,respectively. Results showed that identified amino acids in Prussian carp protein isolated by ISP method, could meet all needs of adults, but a supplementary protein must be used for children. Limiting amino acids in both acidic and basic treatments were methionine and cysteine. Nineteen fatty acids of saturated (SFA), monounsaturated (MUFA) and polyunsaturated fatty acid (PUFA) groups were identified in lipid recovered in isoelectric solubilization/precipitation process. Total PUFA in basic treatment was noticeably higher than in acidic one. N-3/n-6 ratio in basic pH treatment was also higher than in acidic one.
    Keywords: Biology ; Fisheries ; Prussian carp ; Amino acid profile ; Fatty acid profile ; Isoelectric solubilization ; precipitation ; Carassius gibelio ; materials ; Amino acid ; fatty acid ; protein ; Iran
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    Production of single cell protein from stickwater of kilka fish meal factory using Lactobacillus acidophilus and Aspergillus niger (2021)
    In:  http://aquaticcommons.org/id/eprint/21797 | 18721 | 2018-01-10 14:59:49 | 21797 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-02
    Description: We investigated production of single cell protein (SCP) from stickwater of kilka fish meal factory as medium using Lactobacillus acidophilus and Aspergillus niger. Stickwater was used instead of the standard media of bacterium and fungus in a batch culture method. Amount of biomass, COD, RNA and protein in the bacterium and fungus in control and stickwater treatments were investigated. In maximum growth time, amino acids profile of the bacterium and fungus were measured and compared between treatments. Bacterial biomass production in the control and stickwater treatments were 3.16 and 5.12g/l, COD reduction was 33270 and 53330mg/l, the measured RNA were 15.27% and 15.04%, the amount of protein were 71.13% and 68.37%, respectively. The difference between bacterium and fungus biomass production was slight. We found that the amount of the fungus biomass in control and stickwater were 6.31 and 7.28g/l, COD reduction were 47800 and 55200mg/l, RNA was 9.36% and 9.09%, the amount of protein were 51.36% and 48.66%, respectively. In both bacterium and fungus, the maximum and minimum amount of amino acid of the control and stickwater was glutamic acid and methionin. The amount of methionin in bacterium was not different with fish meal and FAO reference and in fungus was a little lower than FAO reference. According to the results, application of pure stickwater was suitable for productionof Lactobacillus acidophilus and Aspergillus niger.
    Keywords: Biology ; Fisheries ; Biomass ; Microorganism ; Stickwater ; Amino acids ; Lactobacillus acidophilus ; Aspergillus niger ; Iran ; kilka ; fish
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    The probiotic effects of dietary inactive yeast Saccharomyces cerevisiae var. ellipsoideus on growth factors, survival, body composition and intestinal microbiota of Beluga juvenile (Huso huso) (2021)
    In:  http://aquaticcommons.org/id/eprint/21807 | 18721 | 2018-01-10 15:03:53 | 21807 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-02
    Description: The probiotic effects of inactive yeast, Saccharomyces cerevisiae var. ellipsoideus was studied on growth performance, survival and intestinal microbiota of beluga juveniles (Huso huso). The study was done in complete randomize design that included feeding of beluga juveniles with diets supplemented with 0 (control), 1, 2 and 5% yeast (4 treatments with 3 replicates). Beluga juveniles (11.40±0.56g) were randomly allocated in 12 oval tanks at a density of 35 fish per tank and triplicate group were fed with experimental diets. At the end of the trial, growth factors (final weight, weight gain, SGR, CF) as well as feed conversion ratio (FCR), body composition (protein, lipid, ash, moisture) and intestinal microbiota (total viable bacteria and Lactobacillus spp. levels) were determined. Our results confirmed that juveniles fed on diet supplemented with 5% S. cerevisiae var. ellipsoideus had significantly higher final weight, weight gain, specific growth rate (SGR) and lower food conversion ratio compared to control and 1% treatment (P〈0.05). However, there were no significant differences between SGR of 5 and 2% yeast treatments (P〉0.05). The study of body composition showed no significant difference between treatments (P〉0.05). Total viable bacteria and Lactobacillus spp. count were significantly higher in 5% treatment compared to control (P〈0.05). However, there was no significant difference between Lactobacillus spp. levels in 5 and 2% treatments (P〉0.05).
    Keywords: Biology ; Fisheries ; Feeding ; Intestinal microbiota ; Beluga ; Saccharomyces cerevisiae ; growth ; survival ; body composition ; Iran ; juvenile ; Huso huso
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    Concentration of heavy metal (Cd, Pb, Ni, Hg) in muscle, gill and liver tissues of Barbus xanthopterus in Karoon River (2021)
    In:  http://aquaticcommons.org/id/eprint/21810 | 18721 | 2018-01-08 09:29:45 | 21810 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: We determined bioaccumulation of heavy metals (Cd, Pb, Ni and Hg) in the muscle, gill and liver organs of Barbus xanthopterus in summer 2009 in Karoon River, south west of Iran. Gill net was used to sample 48 random size fish specimens from Karoon River downward of Ahwaz city (Shekariyeh 3 village). The tissues were extracted and the elements were determined using atomic absorption spectrophotometer. Concentrations of heavy metals Cd, Pb, Ni , Hg in muscle tissue of Barbus xanthopterus were 1.679, 2.37, 1.16, 1.29mg/kg dry wt and in gill were 2.17, 2.92, 1.44, 1.34mg/kg dry wt and in liver were 1.92, 2.79, 1.31, 1.43mg/kg dry wt, respectively. All the results were statistically significant (P 0.05). The concentrations of heavy metals were higher than standards of the World Health Organization (WHO) in the muscle tissue of Barbus xanthopterus in Karoon River.
    Keywords: Biology ; Chemistry ; Fisheries ; Pollution ; Pollution ; Barbus xanthopterus ; Karoon River ; Khuzestan Province ; Iran ; heavy metal ; muscle ; gill ; liver ; tissues
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    Morphology of swim bladder in false trevally (Lactarius lactarius) (2021)
    In:  http://aquaticcommons.org/id/eprint/21815 | 18721 | 2018-01-08 09:58:20 | 21815 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-02
    Description: The swim bladder status of false trevally (Lactarius Lactarius) was studied from November 2007 to October 2008 in coastal waters of the Oman Sea. A number of 702 swim bladders of false trevally specimens were collected randomly from catch composition of gillnets and bottom trawler. False trevally has an unusual swim bladder, as the first and the second spines of its anal fin are joined that creates a single bone, which is called anchorage bone, and passes from the middle of the swim bladder and 2 lobes of the gonad and connects to the 10th vertebra of the spinal column. Another ending of this bone is wide and reaches anal fin base. This bone is like an anchorage for swim bladder of false trevally and it functions as a center of gravity of the fish in anal fin base. It firms the exterior part of the fish body, so the fish swims through rough waters easily.
    Keywords: Biology ; Fisheries ; False Trevally ; Lactarius lactarius ; Swim bladder ; Oman Sea ; Iran ; Morphology
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    Daphnia pulex through physical and chemical factors (2021)
    In:  http://aquaticcommons.org/id/eprint/21808 | 18721 | 2018-01-08 09:21:33 | 21808 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-02
    Description: Regarding the key role and importance of Daphnia in aquaculture, particularly for survival and adaptation of fishes in larval stages, a comprehensive study on hatching rate of Daphnia ephippial eggs was implemented to obtain an optimum technique. The effects of abiotic factors was investigated on the hatching response of Daphnia pulex diapausing eggs collected from live food ponds in Cultivation and Breeding Centre of Gorgan. After isolation, the eggs were kept in dry and wet conditions at 4°C for 2 months in darkness. Following the preincubation period, the eggs in each group were subdivided into 2 parts and treated with 1% NaOCl and distilled water. The effect of temperature levels (15 C, 20 C, 25 C) and photoperiod levels (12L: 12D, 24L: 0D) were identified on the hatching of eggs in AdaM medium during 15 days. Results indicated that the exposure of wet-kept eggs to 12-hour photoperiod and 25 C without soaking in 1% NaOCl, caused the maximum rate and speed of hatching.
    Keywords: Aquaculture ; Biology ; Chemistry ; Aquaculture ; Feed ; Live food ; Daphnia pulex ; Iran ; physical ; chemical
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    Shelf-life determination of tiger-toothed Croaker (Otolithes ruber) during flake ice storage (2021)
    In:  http://aquaticcommons.org/id/eprint/21809 | 18721 | 2018-01-08 09:25:21 | 21809 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: Quality of tiger-toothed croaker stored in flake ice was studied for 19 days by sensory, chemical (total volatile basic nitrogen (TVB-N)), (thiobarbituric values (TBA)), pH and microbial (total viable count, TVC) methods. Sensory scheme was modified according to the panelists perception and a specific schema was created for this fish. Sensory analyses showed that: "gills color and odor", "convexity of eyes", "peritoneum" and "elasticity of flesh" are the best sensory parameters. Results of sensory and microbial analyses had high correlation. Total viable count of flesh was 2.86 log cfu g-1 at first day and reached the limiting level of TVC (106) after 15 days of storage (P〈0.05). TVB-N levels were 15.31mg/100 g tissue at the first day of storage and reached 36.52mg/100 g at the end of storage day (P〈0.05). Measuring amounts of TVB-N showed that total volatile basic nitrogen is a good quality index for tiger-toothed croaker during ice storage. The initial level of TBA was 0.83mg of malondialdehyde per kg flesh (mg MDA/kg) and increased to 3.75mg MDA/kg at the end of storage. TBA levels were less than limiting level (5mg MDA/kg) over the period of storage. According to the results, shelf-life of tiger-toothed croaker was determined 15 days during ice storage.
    Keywords: Biology ; Chemistry ; Fisheries ; Shelf-life ; Quality ; Tiger-toothed croaker ; Flake ice ; Otolithes ruber ; Iran
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  • 43
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    Heavy metals (Ni, Cd, Pb, Cu) concentrations in seaweed and sediments along the coastal areas of Hormuzgan province (Bandar Abbas and Bandar Lengeh) (2021)
    In:  http://aquaticcommons.org/id/eprint/21818 | 18721 | 2018-01-10 17:05:25 | 21818 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: Metals concentrations were studied in dominant seaweeds and their adjacent sediments in Bandar Abbas and Bandar Lengeh tidal areas. The status of selected heavy metals (Ni, Cd, Pb, Cu) was determined in sediments and 15 dominant seaweed species including 4 species of Chlorophyta, 4 species of Phaeophyta and 7 species of Rhodophyta. Samples of seaweed and sediment were collected seasonally during November 2007 to August 2008 from intertidal regions of nine sites along the Bandar Abbas and Bandar Lengeh coasts. Powdered samples of sediments and seaweed were digested and analyzed using Atomic Absorption Spectrophotometer (A.A.S). Concentrations of Cu, Pb, Cd, and Ni were 5.24, 20.44, 5.40 and 33.83µg/g -1 dry wt. in sediments. Concentration of these metals in µg/g -1 dry weight in Chlorophyta were 11.11, 25.79, 4.76 and 46.57, in Phaeophyta were 9.18, 17.68, 4.82 and 36.65, and in Rhadophyta were 9.80, 21.03, 4.96 and 50.43, respectively. The marine seaweed species collected during all seasons and sites in Bandar Abbas and Bandar Lengeh were identified as Entromorpha compressa and Padina pavonica, respectively.
    Keywords: Biology ; Fisheries ; Heavy metals ; Seaweed ; Sediment ; Bandar Abbas ; Bandar Lengeh ; Iran
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  • 44
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    The effects of prebiotic oligofructose on hematological, serum biochemical parameters and liver enzymes of juvenile beluga (Huso huso) (2021)
    In:  http://aquaticcommons.org/id/eprint/21832 | 18721 | 2018-01-11 10:38:05 | 21832 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: The aim of the present study was to investigate the effects of dietary oligofructose (1, 2 and 3%) on blood profiles of beluga Huso huso juveniles (18.77±0.76g). After 7 weeks feeding on experimental diets hematological parameters, metabolic products (cholesterol, glucose and total protein) and serum enzymes (lactate dehydrogenase, alkaline phosphatase, alanine aminotransferase and aspartate aminotransferase) were measured. Compared to the control group (0% oligfructose), oligofructose had no effects on red blood cell counts (RBC), mean corposcular volume (MCV), mean cellular hemoglobin concentration (MCH) or mean cell hemoglobin concentration (MCHC) (P〉0.05). However, hematocrit (Hct), hemoglobin concentration (Hb) and leucocyte counts (WBC) were significantly higher in fish fed 2% oligofructose (P〈0.05). Although serum glucose and total protein remained unaffected, cholesterol was significantly lower in the 2% oligofructose group (P〈0.05). Our results showed oligofructose had no significant effects on serum lactate dehydrogenase, alkaline phosphatase, alanine aminotransferase and aspartate aminotransferase (P〉0.05). These results indicate an immunomodulatory effect and the potential to reduce serum cholesterol levels in beluga sturgeon.
    Keywords: Biology ; Fisheries ; Prebiotic ; Oligofructose ; Hematology parameters ; Serum enzymes ; Beluga ; Huso huso ; juvenile ; enzymes ; biochemical ; Iran
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  • 45
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    Effect of garlic extract on growth and survival rate in Litopenaeus vannami post larvae (2021)
    In:  http://aquaticcommons.org/id/eprint/21878 | 18721 | 2018-01-15 09:23:51 | 21878 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-03
    Description: The effect of garlic extract on growth and survival rates of one day larvae of Litopenaeus vannamei shrimp was tested for 12 days .Six nutritional treatments each with three replicates were fed to shrimp larvae (average weight 0.0013g) including control treatment (unriched Artemia nauplii) and second to sixth Artemia nauplii enriched with 200, 400, 600, 800 and 1000mg garlic extract per kg, respectively. The one way ANOVA results showed that all treatments were different in terms of average weight and total length of larvae compared to control group. Shrimps being fed by Artesia enriched with 200mg garlic extract per kg food have the best growth, survival rates and length (0.0062mg, 81.6% and 10.6mm). Group 3 with concentration of 400mg garlic extract per kg of feed followed by control group showed better growth and survival rates in shrimp larvae than other treatments but the lowest survival rate evaluated in shrimps fed by Artemia nauplii enriched with 600, 800 and 1000mg garlic extract per kg feed, orderly. Specific growth rates (SGR) for treatment groups 2 and 3 were higher compared to other groups.
    Keywords: Aquaculture ; Biology ; Medicinal plants ; Aquaculture ; Nutrition ; Shrimp ; growth ; survival ; Litopenaeus vannamei ; larval ; Iran
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  • 46
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    Assessment of total mercury bioaccumulation in white and red muscle and liver tissues of Cyprinus carpio collected from Sanandaj Gheshlagh Reservoir (2021)
    In:  http://aquaticcommons.org/id/eprint/21881 | 18721 | 2018-01-15 09:36:19 | 21881 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: Previous studies showed that the level of mercury in Sanandaj Gheshlagh Reservoir (SGR) was higher than limits established by the World Health Organization. Total Mercury (T-Hg) concentrations in white muscle, red muscle and liver tissues of Common carp as the most consumed fish in the region were investigated. For the first time the content of mercury in red muscle tissue was measured and compared with white muscle and liver tissues. During the July to December 2009, 24 Common carp were caught from SGR (4 samples per month). THg concentrations in above mentioned tissues were measured, using Mercury Analyzer. T-Hg concentrations variations in white muscle, red muscle and liver tissues were (123-458), (115- 455) and (107-303) ng g-1, respectively. Statically significant differences were found between three tissues. A significant monthly variations of T-Hg concentrations were observed within liver tissue samples. Fish weights in this ranged between 330.1 to 753 grams. T-Hg in white and red muscle tissues in all samples weighted above 500 grams were higher than the limits established by the EPA. Therefore, additional researches are needed to evaluate any potential effluence of this fish consumption on people health.
    Keywords: Biology ; Chemistry ; Fisheries ; Pollution ; Heavy metal ; Pollution ; Common carp ; mercury ; bioaccumulation ; tissues ; Cyprinus carpio ; muscle ; Sanandaj Gheshlagh Reservoir ; Iran
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  • 47
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    An investigation on fish parasites in Hanna Wetland, Semirom, Isfahan Province (2021)
    In:  http://aquaticcommons.org/id/eprint/21877 | 18721 | 2018-01-15 09:13:09 | 21877 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-03
    Description: As a part of a major ecological study of Hanna Wetland, Semirum Region, Isfahan Province, parasitic infestation of 3 native and one introduced fish species were investigated. A total of 120 fish specimens were collected by both cast net and a series of gillnets between fall and winter 2007, and spring and summer 2008. Some of the observed parasites are reported for the first time as new host records of: Trichodina perforata on gill and skin of Carassius auratus auratus and three species of leeches namely: Glossiphonia heteroclite, Thromyzon tessulatum and Hemiclepsis marginata on the skin and fin bases of Capoeta damascina. Moreover, 14 internal and external parasites including: one protozoan; Ichthyophthirius multifiliis and two myxosporeans; Myxobolus varicorhini, Myxobolus sp., three monogeneans; Dactylogyrus lenkoran, Dactylogyrus intermedius and Gyrodactylus sp., two immature digeneans; Diplostomum spathaceum, Tylodephys sp., two mature digeneans; Allocreadium isoporum and A. layman, one unknown cyst, one Acanthocephalan; Acanthocephalorhynchoides sp., one cestoda; Khawia armeniaca. The highest prevalence of Diplostomum spathaceum (100%) was observed in Aphanius isfahanensis and Alburnus sp. However, the lowest prevalence was related to A. layman in Capoeta damascina in winter (0%), and autumn and spring (11%). Leeches infections were only observed in Capoeta damascina and Alburnus sp. in winter and summer, respectively. The maximum average (±SD) infection intensity belonged to K. armeniaca in intestine of C. damascina in spring (12.50±3.40, range: 8-16). Among the parasites identified in the region, D. spathaceum showed the highest mean (±SD) abundance (41.67±11.79) in C. auratus auratus in spring. In general, a relatively high diversity of fish parasitic fauna exists in this water body which could jeopardize fish populations and the whole ecosystem if the ecological status of the Hanna Wetland is neglected.
    Keywords: Biology ; Ecology ; Fisheries ; Parasites infection ; Parasitic worms ; Leech ; Cyprinid fish ; Hanna Wetland ; Semirom ; Isfahan Province ; Iran
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  • 48
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    Correlation between length-weight and age in Barbus sharpeyi and Barbus grypus broodstocks in artificial propagation (2021)
    In:  http://aquaticcommons.org/id/eprint/21862 | 18721 | 2018-01-15 06:22:18 | 21862 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-03
    Description: This study was carried out to identify proper broodstock of Barbus sharpeyi and Barbus grypus using working fecundity indices. For Barbus sharpeyi three female groups were chosen based on previous experiences that included treatment 1: 650±300g, 1±0.5 years, (T.L) 40.68±2.7cm, treatment 2: 1350±350g, 2.5±0.5 years, (T.L) 47.92±4.63cm and treatment 3: 2200±400g, 4±0.4 years, and (T.L) 59.62±3.56cm. The same male broodstock (700±80g) and 2 year old fish were used for all treatments. For Barbus grypus three female groups were chosen using previous experiences that included treatment 1: 2212.5±780g, 2.5±0.5 years, (T.L) 62.68±6.7cm, treatment 2: 4518±780g, 4±1 years (T.L) 79.12±4.36cm and treatment 3: 7712.5±171g, 7.7±1.3 years and (T.L) 92.62±3.13cm. The same male broodstock (1400±100g) and 2 year old fish were used for all treatments. Female broodstock of the two species were injected 3mg/kg of PG hormone two times at an interval of 10 hours and males were injected 2mg/kg. The maximum working fecundity was seen in treatment 2 for Barbus sharpeyi (33000±1450) and Barbus grypus and (13000.37±4651.57). Functional fecundity were calculated for Barbus sharpeyi in all treatments which was significantly different between treatment 2 and other treatments for the two species. After this stage, the working fecundity was decreased in treatments. We conclude that treatment 2 is the best for selection of broodstocks in the two fish species.
    Keywords: Aquaculture ; Biology ; Aquaculture ; Fecundity ; Cyprinids ; Barbus grypus ; Barbus sharpeyi ; length ; weight ; Iran ; fish
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  • 49
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    Effected by dietary nucleotide on changes in intestinal Morphology, growth and fatty acid profile of whiteleg shrimp (Litopenaeus vannamei) (2021)
    In:  http://aquaticcommons.org/id/eprint/21861 | 18721 | 2018-01-15 06:16:56 | 21861 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-03
    Description: The effects of dietary nucleotide (0.2%) on the growth, intestinal morphology as well as fatty acid profile of the whiteleg shrimp, Litopenaeus vannamei was investigated in Bushehr province (Delvar) for a 5-week feeding trial. The experiment was carried out in triplicate in circular PVC tanks of 300L capacity. Each tank was randomly filled with 25 shrimps weighting on average 3.21±0.03g. Added dietary nucleotide significantly improved growth factors such as 10% weight increase, 7.97% increase in specific growth rate (SGR), 11.32% increase in protein efficiency ratio (PER), 9.64% decrease in feed conversion ratio (FCR) and 14:1n5, 20:3n3 and DHA fatty acids. However, no significant differences were evident in survival, carapace length gain, daily feed consumption and saturate fatty acid (SFA), monounsaturated fatty acid (MUFA), poly unsaturated fatty acid (PUFA) content, n-3/n-6 as well as EPA+DHA fatty acids between the two treatments. Intestine epithelium cells height (IECH) in the abdominal first section were significantly higher in shrimp fed by dietary nucleotide.
    Keywords: Aquaculture ; Biology ; Nucleotide ; Fatty acid ; Feeding ; Growth ; Litopenaeus vannamei ; Iran ; morphology ; whiteleg shrimp
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  • 50
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    Goldstrip sardine (Sardinella gibossa) and poultry by-product protein hydrolysate effects on amino acid composition, growth and alevines survival of rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/21868 | 18721 | 2018-01-15 06:52:45 | 21868 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-03
    Description: Effects of Goldstrip sardine (Sardinella gibossa) and poultry by-product protein hydrolysate on amino acid composition, growth and alevines survival of rainbow trout (Oncorhynchus mykiss) were investigated. Two hydrolyzed protein sources were incorporated into six diets for start-feeding rainbow trout (Oncorhynchus mykiss) alevines, in 3 different replacing levels (10%, 25% and 50%) of fish meal. Goldstrip sardine protein hydrolysate (SPH) and poultry by-product protein hydrolysate (PPH) were used, respectively. To compare the results, we used the same diet without protein hydrolysate. The diet with 25% SPH and 10% PPH offered the best results in terms of growth, survival, protein efficiency ratio, protein productive value and condition factor. Alevines fed with 25% SPH and 10% PPH showed more balanced amino acid composition in their body. By enhancing the protein hydrolysate in the diet, free amino acid composition in the diet and fish body was enhanced. The protein hydrolysate enhancement showed negative correlation with growth factors. Also, non essential amino acid composition of the body composition showed positive correlation with the lipid/protein percentage of the alevines. We conclude that an optimum level of protein hydrolysate can improve growth and performance of the rainbow trout alevines. However, excess protein hydrolysate can cause imbalanced amino acid composition in fish body and reduces the growth and survival factors. Based on this study, the optimum replacement of fish meal by SPH and PPH in rainbow trout alevines’s diet is 25% and 10%, respectively.
    Keywords: Aquaculture ; Feeding ; Fish meal ; Aquaculture ; Ration ; Sardinella gibossa ; Oncorhynchus mykiss ; amino acid ; composition ; growth ; survival ; Iran
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  • 51
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    A case of white eye syndrome in cultured whiteleg shrimp (Litopenaeus vannamei) in concrete ponds (2021)
    In:  http://aquaticcommons.org/id/eprint/21874 | 18721 | 2018-01-15 08:59:02 | 21874 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-03
    Description: A month after movement of 1800 pieces of L. vannamei (average weight of 16g) from culture ponds in Heleh region to concrete ponds of Bandargah hatchery (Bushehr province) some shrimps showed symptoms such as decrease in growth rate, loss of appetite, dark pigmentation of cuticle and presence of black foci on it, redness of uropods and white, irregular and circular spots on the eye with 2-5mm diameters. For detection of etiological agent samples were taken for PCR, bacteriological and histo-pathological tests. Nested PCR test using IQ2000 kits for detection of major shrimp viral pathogens (IHHNV, WSSV, YHV and TSV) were conducted and all results were negative. In histo-pathological tests, lesions in eyes were liquefactive necrosis of cone cells and cone crystals with infiltration of hemocyte and formation of micro abscess in the diapteric region of eye. In bacteriological tests, a gram negative pleomorphic bacterium of the genus Aeromonas was isolated. However, it seems that this bacterium is the secondary agent and for detection of the primary agent more research is needed.
    Keywords: Aquaculture ; Aquaculture ; Diseases ; Crustacean ; Aeromonas bacterium ; Litopenaeus vannamei ; whiteleg shrimp ; Iran
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  • 52
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    Concentration of polycyclic aromatic hydrocarbons (PAHs) in Barbatia helblingii at Bushehr waters (2021)
    In:  http://aquaticcommons.org/id/eprint/21901 | 18721 | 2018-01-15 10:14:46 | 21901 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-04
    Description: Many aquatic organisms are important due to human consumption. Yet some organisms can accumulate pollutants from contaminated environment and transfer them to other organisms or human. Among the mentioned organisms, bivalves have potential to accumulate pollutants because their detoxification system is not well developed. Ark clam (Barbatia helblingii) is a filter feeder and edible bivalve species, which is well distributed in Bushehr shoreline. Coastal waters of Bushehr is potentially contaminated by various contaminants particularly Polycyclic Aromatic Hydrocarbons (PAHs) which mainly originate from oil industries and municipal wastewaters. These contaminants may accumulate in Ark clams. In order to study PAHs concentration in B. helblingii about 30 individuals with similar size were collected from 5 stations along Bushehr shoreline. The clam's soft tissues were digested by Soxhlet, extracted with hexane and their PAHs content were analyzed using HPLC (KANUER) system. Results showed that total PAHs content of the clams from Rafael, Sheghab, Abshirinkon, industrial zone and Helyleh were 638.0, 470.7, 140.3, 495.0 and 373.2ng g-1, respectively. Significant correlation was observed between total PAHs concentrations in different stations. Three aromatic rings hydrocarbons constituted the major part of total PAHs. The average total PAHs concentration in the clams was 423.42ng g-1, which was within the range of previous studies in the Persian Gulf or other parts of the world.
    Keywords: Biology ; Pollution ; Oil components ; Bivalves ; Barbatia helblingii ; Bushehr coasts ; Iran
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    Comparison of produced fish protein hydrolysate from viscera and head of silver carp (Hypophthalmichthys molitrix) using alcalase enzyme and internal tissue enzymes (2021)
    In:  http://aquaticcommons.org/id/eprint/21909 | 18721 | 2018-01-16 10:47:13 | 21909 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-04
    Description: In the present study, hydrolysed protein of viscera and head of Silver carp (Hypophthalmichthys molitrix) was compared using Alcalase enzyme and internal tissue enzymes at 2 and 4 hours. The result indicated that product by Alcalase (Treatment 1) had significantly higher protein and rate of hydrolysates than that produced by internal tissue enzymes (Treatment 2). So, the highest mean (±SD) protein (68.10±1.33) was related to treatment 1-head (with Alcalase enzyme) after 4 hours and the highest rate of hydrolysates (29.36±1.35) was related to treatment 1-head (with Alcalase enzyme) after 4 hours. The result indicated that rate of hydrolysates raised as time of hydrolysates increased. However the intensity and rate of hydrolysates is reduced. The highest rate of hydrolysates occurred at 120 minutes in the first. This mode was similar for two treatments. The result can be considered as the Alcalase was preferred to internal enzyme.
    Keywords: Chemistry ; Fisheries ; Biotechnology ; Fish processing ; Fish wast ; Hypophthalmichthys molitrix ; protein ; Silver carp ; tissue ; enzymes ; Iran
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  • 54
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    Effect of Zataria multiflora essential oils on rainbow trout (Oncorhynchus mykiss) complement component activity and lysozyme (2021)
    In:  http://aquaticcommons.org/id/eprint/21919 | 18721 | 2018-01-16 13:19:39 | 21919 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-04
    Description: Influence of dietary administration of Zataria multiflora Bioss was evaluated on complement component activity and lysozyme of rainbow trout (Oncorhynchus mykiss) to determine stimulatory effect of essential oils. Fish weighting 100±10 g were fed with different doses of 10, 20 and 40 ml/kg food for a period of 10 days. Alternative Complement Activity (CH50%) and serum lysozyme activity were measured on days 1, 8, 15 and 29 after the essential oils administration. The obtained results showed that for first and eighth days of sampling, the complement component mean in treatment groups were significant higher than control group, while negligible difference is shown between treatment groups. For fifteenth and twenty ninth days of sampling, no significant difference was seen in the complement component mean among all examined groups. Also, the results of experiment show that for all of days of sampling, essential oils of Zataria multiflora Bioss have no effect on serum lysozyme activity.
    Keywords: Biology ; Fisheries ; Essential oils ; Zataria multiflora ; Oncorhynchus mykiss ; Fish Immune System ; Iran
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    Evaluation inhibitory effect of essential oil Savory (Satureja hortensis) in food fish (2021)
    In:  http://aquaticcommons.org/id/eprint/21917 | 18721 | 2018-01-16 11:09:42 | 21917 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-04
    Description: Aflatoxins are a group of fungal metabolites that are produced by the growth of fungi on food. These toxins cause illness in animals and humans, and are important in economic and humans health. In this investigation, inhibitory effects of savory (Satureja hortensis L.) essential oil were evaluated on the growth of Aspergillus flavus in fish food. A gas chromatograph apparatus linked to a mass spectrometer (GC/MS) was used to identify the effective components in Satureja hortensis essential oil after extraction. Essential oils against Aspergillus flavus incubated in PDA media and antifungal properties of essential oil Satureja hortensis was investigated. About of 300g of food samples was weighted and samples were sterilized by autoclave. Fungal suspension (3cc) was spraied into the feed samples, and various concentrations of essential oils (0, 300, 400, 500, 600ppm) added to samples. The samples were incubated at temperature of (±SD) 28±2°C. After 20-40 and 60 days period, randomly, some sampled were taken from containers and the production of aflatoxin B1, B2, G1, and G2 was measured in the laboratory. This result confirms that 500ppm concentrations of oil savory have antifungal properties against Aspergillus flavus.
    Keywords: Fisheries ; Health ; Aquatic organism ; Food ; Medicine plants ; Fungal poisons ; Satureja hortensis ; Savory ; fish ; Iran
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    Identification, abundance and biomass of benthic communities in south east coasts of the Caspian Sea (Golestan Province) (2021)
    In:  http://aquaticcommons.org/id/eprint/21920 | 18721 | 2018-01-16 13:22:20 | 21920 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-04
    Description: The frequency and distribution of benthic species in the south east coast of Caspian Sea (proposed site for cage and pen culture) were studied. Sampling was carried out in 2 water depths (1, 5) meters and 12 stations were sampled in each depth using VanVeen sampler. Totally, 11 taxa were identified: Pyrgulidae,Ampharetidae, Neritidae, Nereidae, Cardidae, Gammaridae, Naididae, Balanidae, Foraminifera, Ostracoda and Cumaceae. The most abundant taxa were Gastropoda (66.36%), Foraminifera (15.66%), Polychaeta (14.09%) and Bivalvia (1.65%) respectively. The maximum and minimum biomass was 164.1 g/m in summer and 6.56 g/m in spring. Depth, substratum, season, season-depth interaction, season- substratum –depth interaction had significant effects on biomass and had no significant effect on abundance.
    Keywords: Aquaculture ; Biology ; Ecology ; Macro benthic ; Invertebrates ; Caspian Sea ; Iran
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    Parasitic infection in Hemiculter lucisculus, Liza auratus and Gasterosteus aculeatus of the Zardi River (Mazandaran) (2021)
    In:  http://aquaticcommons.org/id/eprint/21931 | 18721 | 2018-01-17 12:19:37 | 21931 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: A total of 76 specimens of three fish species including: Hemiculter lucisculus (41), Liza auratus (16) and Gasterosteus aculeutus (19) were caught using handnet from 3 station in Zardi River in the south-eastern costal of Caspian Sea at autumn and winter 2009 and spring 2010. The fishes were transported alive to the laboratory of Shahid Rajaee Site. They were killed by cutting their spinal cord and their length and weight were measured. The eye, skin, gill, digestive system, muscle and other organism's of the specimens were examined for parasite infestation. Thirteen parasites species were identified. Ichthyobodo necator was collected from skin of Hemiculter lucisculus and Liza auratus. Ichthyophthirius multifiliis was collected from skin or branchia of Liza auratus and Gasterosteus aculeutus, Chilodonella sp. was collected from skin of Gasterosteus aculeutus, Trichodina sp. from skin and branchia of Hemiculter lucisculus, Liza auratus and Gasterosteus aculeutus, Tetrahymena sp. was collected from skin of Gasterosteus aculeutus , Myxobolus sp. from branchia of Hemiculter lucisculus, Dactylogyrus sp. from branchia of Hemiculter lucisculus and Gasterosteus aculeutus, Gyrodactylus sp. from skin or branchia of Gasterosteus aculeutus, Discocotyle sp. and Diplozoon sp. from branchia of Hemiculter lucisculus, Diplostomum spathaceum from eyes of Hemiculter lucisculus, Saccocoelium obseum from intestine of Liza auratus and Corynosoma stromosum from abdominal cavity of Gasterosteus aculeutus. In present study Hemiculter lucisculus was as a new host for Ichthyobodo necator, Myxobolus sp., Discocotyle sp. and Diplozoon sp. also except Saccocoelium obseum from Liza auratus and Corynosoma stromosum from Gasterosteus aculeatus, the other parasites were reported for the first time in Iran.
    Keywords: Biology ; Fisheries ; Parasites ; Zardi River ; Caspian Sea ; Fish ; Hemiculter lucisculus ; Liza auratus ; Gasterosteus aculeatus ; Mazandaran ; Iran
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    Chemical and sensory properties of fish sauce using dried rainbow sardine (Dussumieria acuta) (2021)
    In:  http://aquaticcommons.org/id/eprint/21937 | 18721 | 2018-02-08 02:13:52 | 21937 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: Fish sauce is a dark liquid which produced from fish fermentation in a very high salt condition. This product has a long history and is produced in different procedures and names throughout the world. In Iran, production of fish sauce consists of two steps. At first, fermented extract or Suru is produced from fresh or dried sardine, and Suru is cured with the addition of spices. This study was conducted for the first time in Iran for industrial production of fish sauce from dried Sardine. For this study, fresh sardine was provided from Bandar Abbas Fishery Center. The fish were sun-dried and used for fish sauce production. The effects of mechanical dicing, adding of salt in two levels (100 and 80 percent) and addition of citric acid at 2% were investigated. Sampling was achieved with separation of aqueous phase by vacuum and filter paper. Then, acidity, electrical conductivity, total nitrogen, trimethylamine and salt concentration were measured in the extracted liquid. Results showed that acidity, electrical conductivity and total nitrogen increased, however, the salt content remained constant and the trimethylamine content was decreased during fermentation period. Increase in total nitrogen indicated an increase in protein hydrolysis and nutritional value of the product. Whereas, reduction in trimethylamine content showed a decrease in the number of spoilage bacteria during fermentation. The highest score in sensory evaluation of the products belonged to the low salt (80%) treatment.
    Keywords: Chemistry ; Fisheries ; Fish processing ; sauce ; Chemical ; sensory properties ; rainbow sardine ; Dussumieria acuta ; spices ; Iran
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    Yield of protein recovery and degree of hydrolysis associated protein hydrolysates from Bighead Carp (Aristichthys nobilis) by using enzymes (2021)
    In:  http://aquaticcommons.org/id/eprint/21945 | 18721 | 2018-01-18 08:57:51 | 21945 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: The present study compared the properties of Bighead carp (Aristichthys nobilis) visceral, viscera use of commercial enzymes (Alcalase, Papain, and Protamex), recovery protein and degree of hydrolysis in the various temperatures and times of hydrolysis process. According to results, increase in time and temperature in hydrolysis process, led to increase in both recovery protein and degree of hydrolysis. Maximum of these parameters were observed at 55°C and 60min. minimum of parameters were observed at 35°C and 15min. In addition, among enzymes being investigated, Alcalase had high rate of recovery protein and degree of hydrolysis in equal temperature and times different from others enzymes (Papain and Protamex). Maximum mean of recovery protein for Alcalase was %51.38±2.39 in 55°C and 60 min of hydrolysis process. Also, maximum degree of hydrolysis for Alcalaqse was more than 20% at 55°C and 60 min of hydrolysis process. In conclusion, use of Alcalase enzyme induces product protein hydrolysates from Bighead Carp (Aristichthys nobilis) viscera that have suitable quality than others enzymes (Papain, and Protamex).
    Keywords: Aquaculture ; Chemistry ; Fisheries ; Alkalase ; Papain ; Protamex ; Processing ; protein ; hydrolysis ; Bighead Carp ; Aristichthys nobilis ; enzymes ; Iran
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  • 60
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    Genetic variability and differentiation of common Kilka fish (Clupeonella cultriventris Nordmann, 1840) in the southern coasts of Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21944 | 18721 | 2018-01-18 08:55:31 | 21944 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: A total of 120 samples of adult common Kilka fish (Clupeonella cultriventris) were collected during spring and summer from the southern coasts of Caspian Sea (Bandar Anzali and Babolsar). Fifteen sets of microsatellite primers were developed from Clupeidae being tested on genomic DNA of common Kilka. Allele frequency, observed and expected heterozygosity, FST, RST, FIS index were determined. Five primer sets as polymorphic loci were used to analyze the genetic variation in adults of the common Kilka population. Results revealed that average alleles per locus was 13.1 (range 5 to 22 alleles per locus in regions, Ne=9.5). All sampled regions contained private alleles. Average observed and expected heterozygosity was 0.348 and 0.877, respectively. Deviations from Hardy Weinberg equilibrium were observed in most cases. FST, RST and gene flow estimates in AMOVA and the genetic distance between populations indicated that the genetic difference among the studied populations was pronounced. The data generated in this study provide primary information on the genetic variation and differentiation in populations of Caspian common Kilka.
    Keywords: Biology ; Fisheries ; Population ; genetic ; Microsatellite ; Clupeidae ; Common kilka ; Clupeonella cultriventris ; Caspian Sea ; Iran
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    Study on effect of Rosmarinus officinalis and Zataria multiflora extracts on the stability of fatty acids in frozen silver carp minced (2021)
    In:  http://aquaticcommons.org/id/eprint/21954 | 18721 | 2018-01-18 09:49:23 | 21954 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: In this study, the effect of Rosemary and Zataria extracts on three different treatments in frozen Silver carp minced were studied in normal packaging. Therefore, a control and three treatments were defined: Treatment 1 - Control: frozen meat packaged in conventional Treatment 2: Frozen Silver carp minced + Zataria 300mg/kg in normal packaging Treatment 3: Frozen Silver carp minced + Rosemary 200mg/kg in normal packaging Treatment 4: Frozen Silver carp minced + Rosemary compound (100mg/kg) and Zataria (100mg/kg) in normal packaging After quick freezing of samples in the spiral freezer by individual quick freezing method, to maintain the cold temperature (-18)°C were transferred. For six month, Sampling and measurements to determine the fatty acid profile of the zero phase beginning in the first month and then every ten days, and 15 days in the second month of the third month after the monthly test. Identifying, defining and measuring the fatty acid profile by gas chromatography was performed. In this study, levels of both saturated and unsaturated fatty acids in three experimental and one control were identified as follows: A: SFA: (Saturated Fatty Acid): Meristic C14: 0/ Palmitic C16: 0 /Hepta decaenoic C17: 0 / Stearic C18: 0 / Arashidic C20: 0 B: (MUFA Mono Unsaturated Fatty Acid): Palmitoleic C16: 1-W7 / Oleic C18: 1-W9 /Gadoleic C20: 1 - W9 C: (PUFA Poly Unsaturated Fatty Acid): Linoleic C18: 2-W6 /α-Linolenic C18:3-W3 D: (HUFA High Unsaturated Fatty Acid): Arachidonic C20: 4 - W6 Eicosa panta enoic acid C20: 5- EPA/W3 Docosa hexa enoic acid C22: 6-DHA/W3. Results of this study was to determine keep frozen fish meat containing extracts of Zataria and Rosemary in freezing conditions, stability of different types of fatty acids, mono unsaturated fatty acids, poly unsaturated fatty acids, high unsaturated fatty acids, So that none of the fatty acids measured, were not observed increase or decrease Changes over time while maintaining the oxidation of fatty acids is minimized. The results obtained from the profile of fatty acids and their related indices and statistical tests show the treatment contains Rosemary extract show greater stability than thyme during storage (- 18)°C. According to studies, Frozen minced fish meat treated with extracts of Rosemary, was used until the end of the storage period.
    Keywords: Biology ; Chemistry ; Fisheries ; Antioxidants ; Medicine plant ; Processing ; silver carp ; Rosmarinus officinalis ; Zataria multiflora ; fatty acids ; Iran
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    Evaluation of feeding indices of catfish Arius dussumieri in Oman Sea (Sistine & Baluchistan) (2021)
    In:  http://aquaticcommons.org/id/eprint/21961 | 18721 | 2018-01-18 10:12:01 | 21961 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: Due to study the food regime of Arius dussumieri, a total of 132 specimens were collected from Oman sea waters, Sistine & Baluchistan province. The stomach content, were taken into consideration and it was found that the amount of full, semi-full and empty stomachs were 31, 33 and 36 percent, respectively; of which the highest frequency was in winter (74%) and the lowest was in summer (24%). On the other hand, the fullness index was studied with the highest and lowest value for spring (44%) and winter (5%), respectively. The GaSI shows that A. dussumieri, has better feeding in spring and summer but feeding (up in male) was decreased in autumn and winter. The Food Preference (FP) Index was estimated as: Fishes (39%), Crustacean (40%) and Molluscs (20%) namely all of them are considered as minor food in all four seasons. The most important food items were identification as fishes: Carangidae, Engraulidae & Leiognathidae; crabs: Portunidae & Porcellanidae; shrimp: Alpheidae; cephalopods: Loliginidae & Opisthoteuthidae; gastropods: Muricidae & Naticidae.
    Keywords: Biology ; Fisheries ; Benthic ; fih ; Food item ; Iran ; Oman Sea ; Evaluation ; feeding ; catfish ; Arius dussumieri ; Sistine ; Baluchistan ; Carangidae ; Engraulidae ; Leiognathidae ; Portunidae ; Porcellanidae ; Alpheidae ; cephalopods ; Loliginidae ; Opisthoteuthidae ; gastropods ; Muricidae ; Naticidae
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    Apparent lipid and fatty acid digestion, retention of lipid and growth performance in Caspian salmon (Salmo trutta caspius) fry fed dietary n-3 highly unsaturated fatty acids and vitamin E (2021)
    In:  http://aquaticcommons.org/id/eprint/21965 | 18721 | 2018-01-18 09:46:13 | 21965 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: A 10-week feeding experiment was conducted to investigate the effect of dietary n-3 highly unsaturated fatty acids (n-3 HUFA) and vitamin E interaction on growth, apparent digestibility, apparent retention and utilization of lipid in Caspian salmon fry. Six experimental diets combining three different dietary levels of n-3 HUFAs (L: low: 1+0.5, DHA+EPA, M: medium 2+1, DHA+EPA, H: high 4+2 DHA +EPA g/100g diet) with two different levels of vitamin E (L: low 300 and H: high 1000 mg/kg diet): LL, LH, ML, MH, HL and HH (HUFA/vitamin E) were investigated. Fry with initial mean (±SD) body weight of 600 ± 25 (mg) were randomly distributed in tanks and fed to apparent satiation. Increase in dietary HUFA and vitamin E markedly improved larval growth. The results showed that the survival of Caspian salmon fry was not affected by dietary omega-3 HUFA and vitamin E. C20:5n-3 and C22:6n-3 fatty acids content of polar and neutral lipids positively correlated with their concentration on diets. Apparent digestibility and apparent retention of total lipid was significantly affected by dietary HUFA. The results showed that n-3 highly unsaturated fatty acids and vitamin E had positive effects on growth performance, lipid metabolism and apparent digestibility of Caspian salmon fry.
    Keywords: Biology ; Fisheries ; Caspian salmon ; Highly unsaturated fatty acids ; Lipid ; digestibility ; Vitamin E ; Salmo trutta caspius ; dietary ; fed ; growth ; performance ; Iran
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    Effect of long-term starvation and restricted feeding on growth performance and body composition of juvenile Siberian sturgeon (Acipenser baerii Brandt 1869) (2021)
    In:  http://aquaticcommons.org/id/eprint/21966 | 18721 | 2018-01-18 09:48:56 | 21966 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: The present study was designed and performed to investigate the eefect of long-term some feeding strategies (starvation, restricted feeding at rate of 1% biomass per tank and satiate feeding as control) on growth performance and body composition of juvenile Siberian sturgeon (Acipenser baerii Brandt 1869) for 8 weeks. In this regard, 270 juveniles Siberian sturgeon (average weight 54 ± 6/27 g and density 1.5 g/l) were distributed in three treatments (with three replicates) in 9 fiberglass tanks (1050 l). For all fish in each tank, body weight and total length were individually recorded at a biweekly interval. At the termination of the experiment period, five fish per replicate were caught randomly for proximate composition. Results showed that growth performance of Siberian sturgeon was affected significantly by starvation and restricted feeding periods. Moisture and lipid contents were differed significantly in all treatments; which the highest moisture and lipid contents were observed in starved and control fish, respectively. Protein content in starved fish was significantly lower than other groups, whereas ash contents were not significantly different among the treatments. In general, weight loss and other growth factors of juveniles siberian sturgeon during the food shortage were refered to mobilizing the body lipid reservesand then body protein sources and replacing with water. In fact, juvenile Siberian sturgeon can conserve body protein stores better than lipids during the food shortage period.
    Keywords: Biology ; Fisheries ; Siberian sturgeon ; Starvation ; Restricted feeding ; Growth ; Carcass analysis ; feeding ; performance ; body composition ; juvenile ; Acipenser baerii ; Iran
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    The first report of shrimp Macrobrachium nipponense in Alagol, Almagol and Ajigol Lagoons, Golesta Province (2021)
    In:  http://aquaticcommons.org/id/eprint/21972 | 18721 | 2018-01-18 10:00:32 | 21972 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: For the first time, Oriental river prawn Mcrobrachium nipponense were investigated in three international lagoons the (Aalgol, Ajigol and Almagol) in 209-210; sampling take place monthly using collapsible traps (Funnel Trap). In this study the max 2310 male and 1779 female specimens and min 599 male and 667 female specimens were caught, and, 667 in the Alagol and Ajigol respectively. In the three lagoons, females were smaller than males. Comparing the average mean length males and females showed significant difference among the Ajigol with the other lagoons and the Alagol with the other lagoons respectively.
    Keywords: Biology ; Fisheries ; Macrobrachium nipponense shrimp ; Lagoon ; length ; weight ; relationship ; golesta Province ; report ; first ; Ajigol Lagoons ; Iran
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    The comparison of replacement ratio of Indian major carp with conventional carps in earthen pond in climatic condition of Khuzestan province (2021)
    In:  http://aquaticcommons.org/id/eprint/21942 | 18721 | 2018-01-18 08:44:28 | 21942 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: In May 2009, the fingerlings of Indian major carps, (i.e., catla (Catla catla), rohu (Labeo rohita), mrigal (Cirrhinus mirigala)) were conducted with mean weight 25.4±4.1g, 36.6±3.5g and 58.8±4.5g, respectively. Fingerlings of Indian major carps were cultured the fingerlings of Chinese carps according to the randomized complete block design with 4 treatments and 3 replications in earthen ponds. Four treatments were defined in species ratios and combinations.Treatment-1(T1) with 30 % of Indian major carps (catla, rohu and mrigal) and 70 % of Chinese carps phytophage (Hypophthalmic molitrix), big head (Hypophthalmichthys nobilis) and amur (Ctenopharyngodon idella)) with common carp, treatment-2 (T2) with 50% of Indian major carps and 50% of Chinese carps treatment-3 (T3) with 70% of Indian major carps and 30% of Chinese carps with common carp and treatment-4 (control treatment) with 100% of Chinese carps (with common density and combination in Khuzestan Province). Eevery 45 days, biometry was carried out by using the case net in earthen ponds. The culture period was for six month from May to November. The maximum net production of fishes was obtained inTreatment-2 (50% of Indian major carps) with mean harvest 4254.9 kg/ha. The experimental treatments were not significant with each other and control treatment. In end of culture, mean (SD) weight obtained for rohu, catla and mrigal were 1136±16, 726±122 and 773±89g in T1, were 1129±85, 902±78 and 788±125g in T2 and were 1054±38, 839±168g and 849±106g in T3, respectively. Statistical analysis showed no significantly different in total weight of fish harvest in treatments with control group (customary culture in Iran). However, this experiment determined that Indian major carp could increase production and diversity in warm water fish culture in Iran.
    Keywords: Aquaculture ; Fish Culture ; Catla catla ; Labeo rahita ; cirrhinus mirigala ; Iran ; comparison ; replacement ; Indian major carp ; conventional ; Khuzestan province ; Hypophthalmic molitrix ; Ctenopharyngodon idella ; Hypophthalmichthys nobilis
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    Microbial and biochemical characteristics of fermented fish sausage from common carp (Cyprinus carpio) mince by application of Pediococcus pentasaceus at different incubation temperatures (2021)
    In:  http://aquaticcommons.org/id/eprint/21949 | 18721 | 2018-01-18 09:32:14 | 21949 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: Fermented sausage is a favorite kind of meat-product that has allocated great proportions of meat consumption in the world. For the first time in Iran in this study the production of Fermented sausage from minced meat of common carp was assessed by means of lactic acid bacteria at different incubating temperatures as 15, 25, and 35˚C. To prepare the fish sausage, common carp mince was grounded and mixed with NaCl (3%), glucose (3%) and lactic acid bacteria at 5 log CFU/g and afterward were incubated for 48 h. During the incubation of fish sausage, microbiological tests, moisture and protein content, and TVB-N were measured. According to the results, the higher temperature of 35˚C stimulated the rapid growth of lactic acid bacteria, resulting in a rapid decline in pH, and consequently suppressed the growth of pseudomonas, Micrococcaceae and Enterobacteriacea.
    Keywords: Biology ; Fisheries ; fish sausage ; common carp ; lactic acid bacteria ; fermentation ; Microbial ; biochemical ; Cyprinus carpio ; application ; Pediococcus pentasaceus ; temperature ; Enterobacteriacea ; Micrococcaceae ; Pseudomonas ; growth ; Iran
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    The effects of phytoestrogens Matricaria recutita on growth, maturation of oocytes in the three spot gourami (Trichogaster trichopterus) (2021)
    In:  http://aquaticcommons.org/id/eprint/21995 | 18721 | 2018-01-21 11:52:56 | 21995 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: Chamomile is a rich source of phytoestrogens; these compounds have antioxidant, anticancer. In this study, the effects of chamomile on growing oocytes in immature female gourami fish were examined. Thus 60 immature female gourami fish with an average weight of 2-3 g of 6-treated group were analyzed. Treatments in a completely randomized experimental design with a dose of chamomile (10-20-30-50 mg/kg fish) along with control (no injection) and ethanol control (solvent injection) and with three replicates were tested. The fish adaptation to the environment lasted 3 days. The extract injections were done for 20 days, in 10 periods, every other day. In order to histological study, three days after end of the experiment, the ovarian tissue was removed and weighed, tissue processing and staining steps done with hematoxylin- eosin. At last the histological structure of the ovaries and the average percentage of treated fish gonadal indices were compared with the control group. According to our results of gonadal index, there was no significant difference between the control groups with receiving Ethanol (p〉0.05). Histological results showed that increasing the dose of chamomile extract accelerate oocyte maturation in three spot gourami. This is the fourth treatment (dose, mg / kg 50) to show its obvious. The difference between oocyte diameter was observed with increasing doses of Chamomile and in comparison with the control group, the difference was significant (p 〈0.05). Histological results showed that increasing the dose of Chamomile accelerate oocyte maturation in three spot gourami.
    Keywords: Aquaculture ; Biology ; Matricaria recutita ; Trichogaster trichopterus ; Gonadal index ; phytoestrogen ; growth ; three spot gourami ; Iran
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    The first phylogenetic study of Goniobranchus annulatus (Mollusca: Nudibranchia) in subtidal area of Chabahar, Oman Sea, Iran, based on sequence of cytochrome oxidase C subunite I gene (2021)
    In:  http://aquaticcommons.org/id/eprint/21953 | 18721 | 2018-01-18 09:42:07 | 21953 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: Nudibranches are the largest group of Hetrerobranches, (a sub-branch of Opisthobranchia) and are widespread and cosmopolitan species. They vary in shape and colors and occur in all waters from intertidal to deep sea zones and from polar to the tropics regions. Nudibranches are subdivided in two main groups including Anthobranchia and Cladobranchia. In the present study, based on morphology the studied species was identified as Goniobranchus annulatus that belong to Anthrobranchia group. In molecular analysis the sequences of the partial mitochondrial COI gene of Goniobranchus annulatus species from Iran with 15 similar sequences of nudibrnaches from gene bank were compared. Phylogenetic based on Neighbor_joining analyze showed a monophyly relationships between families of nudibranches and also revealed that Goniobranchus vibratus is a sister taxa to the Gonidbranchus annulatus from Iran Goniobranchus annulatus with 100% bootstrap support.
    Keywords: Biology ; Fisheries ; Gasteropoda ; CO1 ; Chabahar coast ; phylogenetic ; Goniobranchus annulatus ; Nudibranchia ; Mollusca ; cytochrome ; gene ; Oman sea ; Iran
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    Investigation on replacement of fish oil by vegetable oils (rice bran, soybean and linseed) in diet of rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/21955 | 18721 | 2018-02-08 05:50:46 | 21955 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: The aim of the present study was to determine the impact of replacing the fish oil by alternative lipid sources in diets for rainbow trout (Oncorhynchus mykiss) on growth, fatty acid profiles of muscle. Five isonitrogenous and isoenergetic semipurified diets were formulated containing 100% rice bran oil (RBO), 100% linseed oil (LO), 100% Soybean oil (SO) and a 1:1:1:1 rice bran, linseed, soybean and fish oil mixture (MX) were compared to a pure fish oil (FO) diet. The diets were fed to apparent satiation twice a day to triplicate groups of 30 rainbow trout with an initial weight of 90g for 15 weeks at 12°C.At the end of the experiment, fillet samples were collected from fish for the measurement of fatty acid profile and fillet composition. Fish fed the FO diet had the highest weight gain over the experimental period (280.28 g), However no differences in growth rate and CF were observed across diet groups. Feed conversion ratios (FCR) ranged from 1.12 to 1.24. Significant difference in FCR was found in the group fed an FO diet. The fillet lipid concentrations and fatty acid composition of the fish were significantly affected by the experimental diets. Fish fed the FO diet contained significantly lower lipid levels (20.18%) than those fed the 4 other diets. The highest level of n-3 PUFA concentrations were recorded in fish fed the LO diet (21.8) with significant difference than other diets and the lowest were in those fed the RBO diet (7.84). Fish fed the SO diet contained significantly higher level of n-6 PUFA concentrations (31.72) than other diets and the lowest were in those fed the FO diet (19.15). Fish on the FO diet had a significantly greater percentage of DHA (10.10%) in muscle tissue compared with fish on all other diets and the lowest was in those fed the RBO diet (2.81%). However, the highest level of eicosapentaenoic acid (EPA) concentrations was recorded in fish fed the SO diet (1.84%) and the lowest in those fed the diet (0.67%). This study showed considerable reductions (about 3-fold) in the n-3/n-6 ratio when FO in the fish diet was replaced by rice bran and soybean oils, which may be extremely negative from a nutritional point of view. In other hand linseed oil had the highest n-3/n-6 ratio (0.91) that was comparable with fish oil n- 3/n-6 ratio (0.89). The results in this study imply that an appropriate mix of vegetable oils and FO can replace the sole use of FO in fish feeds.
    Keywords: Aquaculture ; Biology ; Vegetable oils ; Fish oil ; Fatty acid ; composition ; Rainbow trout ; Growth ; parameters ; Oncorhynchus mykiss ; diet ; Investigation ; soybean ; linseed ; Rice bran ; Iran ; fish
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    A needs assessment of fish (common carp) culture agency members in Guilan and Mazandaran Province (2021)
    In:  http://aquaticcommons.org/id/eprint/21967 | 18721 | 2018-01-18 09:54:14 | 21967 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-05
    Description: The main objective of this study is an investigation of educational needs of fish is cammon carp Proudation cooperatives and effective factors on mentioned educational needs. This research was applicable from objective point of view and descriptive-correlation method considering its method, which has been done with survey approach. The statistical population is the members of the fish is cammon carp Proudation cooperatives in Guilan&mazandaran Province which were included 2235 persons. Among this population, 160 persons were selected using Cochran formula and proportional stratified random sampling method. Managers production Which were 19 production cooperatives in the province, was census through the survey method Meanwhile, the total number of 38 experienced experts in fishculture of Guilan & mazandaran provinces Fisheries Researeach organization .The main tool for data collection was questionnaire and its reliability was calculated by Cronbach’s alpha coefficient, The main tool for data collection survey questionnaire and its reliability by a panel of experts confirmed were valid questionnaire study using the alpha coefficient to mean parts inventory intensive manufactures 73% and surveys of experts and managers of cooperatives by Cronbach’s alpha coefficient of 78% was calculated More than 70 percent of the average of the current knowledge of warm water fish production in Guilan and Mazandaran is moderate to high. Educational needs of producers fish in warm- water showed a significant relationship between income level and their knowledge. Results showed that the management of health and diseases in warm-water fish farms, fish farms, water management, and site selection and construction of warm water from the producers' point of view, experts and managers of cooperatives is the educational priority.
    Keywords: Aquaculture ; Education ; Fish culture ; Need assessment ; Warm water Cooperatives ; Producers ; Production Management ; Warm water fish ; cammon carp ; Guilan ; mazandaran ; Iran
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    Biological monitoring of heavy metals (Pb, Cd, Fe, Zn, Ni, Cu) by tissues of Capoeta damascina from Sezar River, Lorestan Province (2021)
    In:  http://aquaticcommons.org/id/eprint/21969 | 18721 | 2018-01-19 10:56:57 | 21969 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: This study was carried out in order to measure and compare heavy metals levels (Pb,Cd,Fe, Zn, Ni and Cu) in gill and muscle of Capoeta damascina. 60 fish were caught from 3 stations in Tangeh haft zone from Sezar river. Heavy metals were measured by Atomic Absorption spectrophotometery. The highest concentrations of heavy metals Fe〉Zn〉Pb〉Ni〉Cu〉Cd, respectively. The average heavy metals concentration in gill and muscle have significant different (P0.05). The results of this study showed that there were significant difference between heavy metals concentrations in gill, liver and muscle (P〉0.05). The results of this study showed that there were significant difference between heavy metals concentrations in gill, liver and muscle (P 〈0.05). According to the result of this study concentrations of Pb in Capoeta damascina are height than international standard FAO, WHO, NHMRC, UK (MAFF).
    Keywords: Biology ; Environment ; Fisheries ; Capoeta damascina ; Heavy metals ; Sezar River ; Lorestan province ; Biological monitoring ; Iran
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    Identification of larval stages of lantern fish in Iranian waters of Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21991 | 18721 | 2018-01-21 11:43:36 | 21991 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: The fish larvae identification survey was carried out in Iranian waters of Oman Sea from Hormuz strait to Gwader Bay in 2009 at pre and post monsoon periods. Sampling was done by plankton net with 300 μ mesh size. Totally, 168 specimens were collected that belong to the three genera; Benthosema، Diaphus and Lampadena. Two species named Benthosema pterotum, B.fibulatum were identified. B.pterotum has pigment on the tip of the lower jaw and snout whereas B .fibulatum lacks these discriminative characters. Two genera Diaphus and Lampadena have a row of melanophores in post-anal region ventrally which discriminate them from Benthosema. Diaphus is separated from Lampadena with a small melanophore at the hypural.
    Keywords: Biology ; Fisheries ; Larvae ; Myctophidae ; Identification ; Oman Sea ; Iran ; Benthosema ; Diaphus ; Lampadena ; Benthosema pterotum
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    Total replacement of fish oil by vegetable oil with a return to fish oil in Caspian Sea salmon (Salmo trutta caspius) 1: Growth performance, flesh fatty acid profile, and lipid metabolism (2021)
    In:  http://aquaticcommons.org/id/eprint/21996 | 18721 | 2018-01-21 11:55:26 | 21996 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: The effect of complete substitution of vegetable oils (cottonseed, soybean and grape seed) and a return to fish oil diets on growth parameters, survival and metabolism of free fatty acids in the diet of fish in the Caspian Sea, was investigated. Four experimental diets containing 100% fish oil, cottonseed oil, grape seed oil and soybean oil were fed to triplicate group of fingerlings (initial weight 3.6 g) for 60 days. No significant difference was detected for weight gain, specific growth rate and survival. Fillet fatty acid composition was analyzed and the results showed that fillet fatty acid composition was highly affected by dietary fatty acid profile. The highest accumulation rate of linoleic acid and linolenic acid was observed in the fish fed vegetable oil based diets. The results showed that feeding vegetable oil based diets stimulated elongation and desaturation pathway of C18 PUFA in fingerlings. However, the highest amount of EPA, DHA arachidonic acid (AA) was observed in fish oil based diet. At the end of the second period, after return to fish oil based diet, muscle fatty acid composition (total saturated fatty acid, linoleic and linolenic acid) of the fish fed previously vegetable oil based diets were still different to those fed fish oil based diet.
    Keywords: Aquaculture ; Biology ; Salmon ; Metabolism ; Fatty acid ; Vegetable oil ; replacement ; fish oil ; Salmo trutta caspius ; Caspian Sea ; Growth ; performance ; lipid ; metabolism ; feeding ; Iran
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    The control of recovery process with clove tree (Eugenia caryophyllata) in rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/21998 | 18721 | 2018-01-21 12:00:20 | 21998 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: In order to investigate the effect of different temperature of anesthetic (clove tree) and recover (anesthetic-free water) solutions on recovery process, The anesthetic induction times and recovery times of 540 fingerlings of rainbow trout (Oncorhynchus mykiss) weighing 3.2 ± 0.2 g in anesthesia/ recovery solutions with cross-combined of temperature of 5,11 and 17 °C as experimental treatments (9 treatments) were compared. The anesthesia was induced by170 ppm of aqueous clove (Eugenia caryophyllata) solution. Results showed that both induction and recovery times were adversely temperature-dependent. Recovery times of treatments, related to temperature of anesthetic solutions and their temperature, were significantly different (P 〈 0.05). Our results indicated that mean recovery time (three temperature treatments) of the fish exposed to the lower temperature anesthetic solutions generally decreased opposing with higher anesthetic solutions. The lowest recovery time (61±11.1 seconds) in17°C anesthetic-free water occurred in fishes induced to 5°C anesthetic solution. In contrast, the highest recovery time (523±154 seconds) in 5°C water happened in fishes induced to 17°C anesthetic solution. Warm and cold thermal difference in anesthetic and recover solutions could extend recovery time 1 up to 8 minutes. Regarding to aim and demanded time, by selected favorite temperatures can control anesthesia/or recovery time in order to prevent the use of drug over-dosing.
    Keywords: Aquaculture ; Biology ; Rainbow trout ; Clove tree ; Recovery ; Temperature ; Oncorhynchus mykiss ; Eugenia caryophyllata ; fingerlings ; Iran
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    The effect of probiotic Pediococcus acidilactici on growth performance, blood and some serum parameters in Caspian salmon (Salmo trutta caspius) (2021)
    In:  http://aquaticcommons.org/id/eprint/22003 | 18721 | 2018-01-21 12:10:07 | 22003 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: The effect of probiotic Pediococcus acidilactici on growth performance, blood and some serum parameters on Caspian salmon (Salmo trutta caspius) was studied. An experiment was designed with five treatments each with three replicates. Two hundred and seventy Caspian salmons average (±SD) initial weight of 6.9 ± 0.1 g were assigned to fifteen experimental tanks. The experimental period was eight weeks. At the end of this period, the growth parameters were measured. In addition, after 8 weeks feeding on experimental diets, hematological parameters and metabolic products (cholesterol, glucose and total protein) were measured. Results showed that feed conversion in five treatments (0.4 g probiotic) significantly was lower than control group. Specific growth rate, final weight and weight gain in treatments (0.2 g) compared with the control group significantly increased. Use of probiotics in the diet, showed no significant differences in hemoglobin, hematocrit and mean cell hemoglobin concentration (MCHC). The mean cellular hemoglobin concentration (MCH) and mean corpuscular volume (MCV) were significantly increased in five treatments (0.4 g) compared with the control group, but significantly decreased red blood cell counts (RBC) in five treatments. White blood cells also increased the amount of probiotics 0.2 g. The results of this study indicated that 0.2 g/kg Pediococcus acidilactici probiotics in the diet could be a useful food supplement and should be used to improve the growth parameters in Caspian salmon.
    Keywords: Aquaculture ; Biology ; Pediococcus acidilactici ; Parameters ; blood ; Growth ; Caspian salmon ; Iran ; Salmo trutta caspius ; performance
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    Effect of herbicide Atrezine chronic toxicity on bioaccumulation process in fillet of Barbus grypus (2021)
    In:  http://aquaticcommons.org/id/eprint/22012 | 18721 | 2018-01-22 11:11:57 | 22012 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: Atrazine is one of the most important and effective pollutant in aquatic ecosystems. The largest sugar cane farms of Middle East is located in Khouzestan Province, Iran in which large amounts of Atrezine are being used in farming. The aim of this study was to investigate acute toxicity (LC50 96 h) of atrazine on barbus grypus and the effects of chronic toxicity with sub-lethal concentration of atrazine on bioaccumulation of atrazine in fish fillet. LC50 96 h of atrazine on barbus grypus was measured according to the OECD standard method, 180 barbus grypus were divided into 4 equal groups (in triplicates). Groups 1, 2 and 3 were exposed to 3.25 mg l-1 (5%), 6.5 mg l-1 (10%) and 13 mg l-1 (20%) of LC50 96 h concentrations, respectively. Group 4 exposed to toxin free water as a control group. Experimental exposures did last for 21 days, muscles samples of the large dorsal muscle were taken on days 0, 7, 14 and 21 of experiment. Bioaccumulation of Atrazine was measured in the muscle at days 0, 7, 14 and 21 in all groups. Results indicated that atrazine was toxic for barbus grypus and its toxicity increased not only with increase in atrazine but also with increase in the exposure time. The bioaccumulation of atrazine in fish muscles was increased significantly in groups 2 and 3 in all sampling periods and in groups 1 only in day 21. The results of present study showed that placing barbus grypus in the presence of chronic and sub lethal concentrations of the herbicide Atrazine for three weeks may lead to accumulation of toxins in the fish fillets.
    Keywords: Biology ; Fisheries ; Pollution ; Atrazine ; Chronic toxicity ; Bioaccumulation ; Barbus grypus ; fish ; fillet ; Iran ; muscles
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    Introduction of metallic pollutant (Fi , Ni) reducing bacteria in Musa Bay (2021)
    In:  http://aquaticcommons.org/id/eprint/22015 | 18721 | 2018-01-22 11:20:33 | 22015 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: In order to isolate bacterial strains resistant to iron and nickel, deposit samples were collected from five stations in Musa Bay and cultured on BHI agar medium containing 1000 ppm of iron and 50 ppm of nickel. Endurance threshold of strains isolated to different concentrations of iron (1000- 15000 ppm) and nickel (100- 25000 ppm) in BHI broth medium were evaluated, the most resistant strains were selected and MIC and MBC were determined. Results of the current study demonstrated that among 16 and 12 resistant strains to nickel and iron, two selected strains (Bacillus subtilis and Micrococcus sp. ) as the most resistant strains had MIC and MBC (29700 and 29800 ppm) and (26300 and 26500 ppm ), respectively, Iron’s MIC was not assessed. Results of atomic absorption analysis demonstrated that the highest amount of nickel reduction in a medium with concentration of 194 ppm and 71 ppm were 16.7% and 63% after 72 hours by selected strain of Bacillus subtilis respectively, and in a medium containing 158 ppm iron, after 50 hours 8.4% by selected strain 7, while dead biomass of strain 16 reduced nickel to the amount of 40.6% and it reduced 21% and 4% of iron in solutions with 46 ppm and 792 ppm of iron. Results of molecular analysis demonstrated that strain 16 was Bacillus subtilis. In addition, Bacillus subtilis being isolated in this study with ability of nickel and iron removal is an appropriate candidate to be used in aquatic environments.
    Keywords: Biology ; Pollution ; Bacillus subtilis ; Micrococcus sp. ; Fe ; Ni ; Musa Bay ; nickel ; iron ; Iran
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    Effect of fluoxetine on food intake and feeding behavior of goldfish Carassius auratus (2021)
    In:  http://aquaticcommons.org/id/eprint/22018 | 18721 | 2018-01-22 11:29:43 | 22018 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: Serotonin is one of the monoamines that play an important role in food intake in mammalian species. The increase in serotonergic activity may reduce appetite. Fluoxetine as an active ingredient of Prozac is increased in serotonin content by blocking reuptake of it. Due to the release of these substances into the ecosystem, the role of fluoxetine on food intake and feed behavior of goldfish, Carassius auratus was investigated. In experiment 1, fish with 21-49 g weight divided in four groups of control: with no injection; saline injected; and two groups with 1 µg g-1 and 10 µg g-1 body weight fluoxetine. Animals were injected every other day for a total of 5 injections. Food intake calculated after each injection and fish reweighted at the end of the experiment to achieved weight changes. In experiment 2, 20 goldfish were selected in two groups of control and injected with 10 µg g-1 body weight fluoxetine to asses feed behavior test. Fish were injected every other day for a total of 5 injections and feed behavior was investigated after each injection. Food intake was significantly decreased after fluoxetine injections. In the Flu-10 group, low intake of food resulted in minimum weight gain among all treatments. Also, fluoxetine affected the feed behavior of goldfish and significantly was decreased in search and consumption of food. Results showed that this recently toxic environmental material can largely affect the food and weight parameters of goldfish.
    Keywords: Biology ; Ecology ; Fisheries ; Pollution ; Fluoxetine ; Goldfish ; IP injection ; Food intake ; Feeding behavior ; Carassius auratus ; ecosystem ; weight ; Iran
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    Utilization of poultry by product meal as an alternative protein source for Huso huso within growth period (2021)
    In:  http://aquaticcommons.org/id/eprint/22017 | 18721 | 2018-01-22 11:25:55 | 22017 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: With regard to increasing the fish meal price, utilization of hygienic and analyzed poultry by product meal as an alternative protein source in diets for Huso huso within growth period were investigated. Six test diets isonitrogenous and isocaleric (contain 42% protein and 20 Mj kg-1 energy) were prepared. Fish meal was substituted by poultry by product at 20% (PBM20), 40% (PBM40), 60% (PBM60), 80% (PBM80) and 100% (PBM100) in base diet, respectively. A total of 180 Huso huso with average (±SD) weight of 107.89±5.9gr were stocked in 18 fiberglass tanks (Voloum:2000 lit,Temperature:20±2C 0) and fed satiation to 18 weeks. No significant differences were detected between final weight (FW),weight gain (WG) and specific growth rate of fish fed (PBM0), (PBM20), (PBM40), (PBM60) and (PBM80) respectively. The Highest protein belonged to fish fed PBM20 (%16.97±0.36) with significant difference with PBM40 (% 15.41 ± 0.67), respectively. Body lipid fish fed PBM80 and PBM100 (%6.63±0.016) (%7.49±0.17) were significantly lower than other treatments. The Synchronic hepatosomatic index increased with increasing poultry by product in diets and highest rate were found in fish fed PBM 100 , but except PBM20, visceral index in fish fed other treatments was same. The result showed that up to 80% fish meal could be replaced by poultry by product with no adverse effect on growth and feed conversion ratio for Huso huso within growth period.
    Keywords: Aquaculture ; Biology ; Huso huso ; Fish meal ; Poultry by product ; Growth rate ; Body composition ; Hepatosomatic index ; Visceral index index ; Utilization ; protein ; Temperature ; weight ; fed ; feed ; Iran
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    Changes of biochemical, sex steroids and carcass composition of stellate sturgeon (Acipenser stellatus) juveniles fed different dietary levels of 17-ß estradiol (2021)
    In:  http://aquaticcommons.org/id/eprint/22039 | 18721 | 2018-01-25 08:15:09 | 22039 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: This study was carried out to find the effects of 17-ß estradiol (E2) on biochemical parameters, sex steroids and carcass composition in juvenile stellate sturgeon (Acipenser stellatus). One hundred and eighty 5-month stellate sturgeon with an average weight of 11.7 ± 0.2 g were divided into 3 treatments with 3 replicates each with 20 fish per tank. The treatments were included 0, 25 and 50 mg E2/kg diet. At the termination of 7 months feeding trial with different levels of E2, blood biochemical parameters, sex steroids and carcass composition were measured. The results of biochemical parameters including plasma glucose, total protein, cholesterol, triglyceride, calcium and phosphorus showed dose-dependent manner. The lowest and highest levels of all biochemical parameters were observed in fish fed control and 50 mg E2/kg diet, respectively (p〈 0.05). Plasma sex steroids concentrations showed the lowest level of E2 in fish fed control diet, while the highest levels of testosterone and progesterone were observed in this treatment (p〈 0.05). Proximate carcass analysis showed no significant difference in moisture, crude protein, crude fat and ash contents among the treatments (p〉 〉0.05). Final weight, total length, hepatosomatic and viscerosomatic indices were also affected by different levels of E2 (p〈 0.05). The results of present study demonstrated that using E2 in the diet of juvenile stellate sturgeon can influence most of biochemical indices and sex steroids which seems that those were related to the changes of sex ratio and some physiological parameters.
    Keywords: Aquaculture ; Biology ; Chemistry ; Stellate sturgeon ; Sex steroids ; Biochemistry ; Growth ; sex ; composition ; Acipenser stellatus ; juveniles ; fed ; dietary ; levels ; 17-ß estradiol ; Iran
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    Effects of sub-lethal concentrations of Euphorbia turcomanica extract on some liver biochemical parameters of Zebra Aphanius (Aphanius dispar) (2021)
    In:  http://aquaticcommons.org/id/eprint/22024 | 18721 | 2018-01-25 06:57:33 | 22024 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: In the present study, effects of sub-lethal concentrations of Euphorbia turcomanica extract with ranging from 0.00, 0.0055 (5% of LC50), 0.011 (10% of LC50) and 0.022 (20% of LC50) g/lit were investigated over 30 days on biochemical parameters of Zebra Aphanius (Aphanius dispar). The average (±SE) 24, 48, 72 and 96 LC50 rates of E. turcomanica on fish were 0.28±0.14, 0.19±0.06, 0.14±0.03 and 0.11±0.02 g/lit, respectively. The biochemical parameters including aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase (LDH), creatine phosphokinase (CK), and alkaline phosphatase (ALP) activities in the liver tissue were measured after 15 and 30 days. Significant changes in AST, ALT, ALP, LDH and CK activities were observed in fish exposed to different concentrations of E. turcomanica extract when compared with control group. The significant increase was determined in AST, LDH and ALP while in ALT and CK, significant decrease was revealed. Also in liver total protein, a significant descending trend related to exposure time was demonstrated. In conclusion, the findings from this study provide basic information about toxicity of E. turcomanica extract on Zabra Aphanius, as well as developing guidelines for evaluating the effects of administration of E. turcomanica derivatives in water.
    Keywords: Biology ; Chemistry ; Fisheries ; Aphanius dispar ; Euphorbia turcomanica ; Sub-lethal concentration ; Hepatic enzymes ; parameters ; Zebra Aphanius ; biochemical ; liver ; tissue ; toxicity ; Iran
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    Quantitative assessment of the impact of Mnemiopsis leidyi on the southern Caspian zooplankton structure during 1996-2010 (2021)
    In:  http://aquaticcommons.org/id/eprint/22038 | 18721 | 2018-01-25 08:12:25 | 22038 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-06
    Description: After the arrival of the invasive species (Mnemiopsis leidyi) in the Caspian Sea (in 1999) significant changes have been occurred in the ecosystem. In the present study, the data concerning the period 1996 to 2010 (extracted from the relevant research projects) were analyzed. The period was classified into two phases, before and after the species invasion (1996 and 2001-2010). In our study, the impact of the invasive species on the structure of southern Caspian zooplankton communities was assessed during the period 2001-2010, quantitatively. The combination of abundance and distribution range of the species (ADR) during the period 2001-2009 and the year 2010 were evaluated as E (occurrence in high numbers in all localities) and D (occurrence in moderate numbers in all localities), respectively. Considering the obtained results, the year 2001, in which the relative biomass was more than 90 percent, could be considered as the expansion phase and the following years (2002-2010) as the adjustment phase. With regards to the loss of the keystone and some other native species after the invasion of M. leidyi (2001 to 2010), the impact of the invasive species on the structure of southern Caspian zooplankton communities was assessed as massive (C4).
    Keywords: Biology ; Ecology ; Mnemiopsis leidyi ; Zooplankton ; structure ; Southern Caspian ; Sea coast ; Iran
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    The study of zooplankton population structure in Anzali Wetland (2021)
    In:  http://aquaticcommons.org/id/eprint/22050 | 18721 | 2018-01-25 08:45:13 | 22050 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-07
    Description: Anzali wetland is one of the most important places for migratory fishes. Zooplankton organisms are the first consumers in the ecosystem. They are perfect food for the larvae of fishes. Six stations from different areas of wetland were examined for the study of zooplankton population during March 2011 to April 2012. Sampling was done by tube (PVC) and passing through of 30 micron plankton net. The samples were identified and counted by inverted microscope. According to the results, 60 Genus and 6 phylum (11, 31, 10, 2, 1, 1, 1, 2 genus of phylum Protozoa, Rotatoria, Arthropoda, Gastrotricha, Mollusca, Tardigrada, Nematoda, Porifera, Annelida) respectively were identified. The results showed that the maximum annual average density of zooplankton was observed with 2497 ± 687number per litre in Karkan station and the population was more in the summer than in other seasons. Density of Rotatoria, protozoa and superclass Copepoda were 48%, 45% and 6% respectively. Results showed the population structure of zooplankton did not change much compared to past studies (due to improper environmental conditions), excluding Protozoa but the diversity of all zooplankton group is extremely declined. Kruskal Wallis test showed there was not significant difference between density of zooplankton in different stations, months and seasons (p〉0.05), but significant differences were found between densities of different zooplankton phylum (p〈0.05).
    Keywords: Biology ; Ecology ; Fisheries ; Zooplankton ; Anzali wetland ; Density ; Diversity ; population ; structure ; Iran
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    Changes of growth, food intake and plasma cortisol in juvenile common carp (Cyprinus carpio) following cortisol injection (2021)
    In:  http://aquaticcommons.org/id/eprint/22048 | 18721 | 2018-01-25 08:41:43 | 22048 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-07-07
    Description: The present study conducted to investigate the effect of cortisol injection on growth indices, food intake and plasma cortisol in juvenile common carp (Cyprinus carpio). After 2 weeks adaptation, 240 fish with 19.5 ± 0.2 g average weight were randomly distributed in to 12 fiberglass tanks with four treatments and three replicates (20 fish per tank). Based on body weight, cortisol (mixed with oil) was injected to treatments with different dosages at 0 (C0), 1 (C1) and 10 (C10) µg/g. At the end of 21 days, fish were weighed and growth parameters showed significant reduction in C10. No significant change was observed in hepatosomatic index among different treatments. Food intake were recorded daily during the experiment and showed significant reduction in days 1 to 8, 16 and 19 in C10 compared to control group . Blood was taken to determine plasma cortisol at the start, day 3, day 7 and day 21 of the experiment. Cortisol concentrations showed significant reduction in C10 compared to C0 group three days after the initiation of the experiment. The results showed that increasing of cortisol in a short time after injection, affected by changes of blood plasma cortisol and reduction of food intake could negatively have an effect on growth.
    Keywords: Aquaculture ; Biology ; Chemistry ; Cortisol ; Stress ; Appetite ; Liver ; Common carp ; Cyprinus carpio ; plasma ; food ; growth ; juvenile ; blood ; Iran
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    The effect of dry salting on the shelf life of big mouth saury (Scomberoides commersonnianus) (2021)
    In:  http://aquaticcommons.org/id/eprint/22021 | 18721 | 2018-01-22 12:19:16 | 22021 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: The present study investigated the effects of salting process on shelf life of big mouth saury (Scomberoides commersonnianus) filets. To determine the quality, chemical experiments including crude protein, peroxide value, crude lipid, ash-salt and moisture measurements were conducted at time intervals of 0, 15, 30, 90, 150 and 190 days. Moreover, fatty acid profile was measured at time intervals of 0, 90 and 190 days. Mean (±SD) crude protein, crude lipid, ash-salt and moisture contents in fresh fish were 20.07±0.85, 6.32±0.42, 2.17±0.2and 71.44±0.19, respectively, reaching 30.5±1.19 8±0.12, 17.6±0.1 and 43.9±0.91, respectively, after salting and storing at the ambient temperatures for 190 days. The mean (±SD) peroxide was 0.05±0.01 meqO2 kg-1, and in fresh fish reached to 2.5±0.05 meqO2 kg-1 at the end of storage time as salted products. Variations in all of these factors were significant. According to the obtained results, the best time period for storing is 90 days. In the present study, 21 fatty acids were recognized. Total saturated, and unsaturated fatty acids in fresh samples (time 0) were 53.41 and 54.47%, respectively, and reached 56.99 and 39.92 at the end of storage time as the salted product. The result of the organoliptic showed that the new method of the dry salting give a better quality to the product in comparison with the traditional method of dry salting.
    Keywords: Biology ; Chemistry ; Fisheries ; Scomberoides commersonnianus ; Salting ; Shelf life ; dry ; quality ; protein ; fatty acid ; lipid ; comparison ; Iran
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    Effect of herbal supplement of sangrovit on growth, blood biochemical parameters, survival and resistance to salinity stress of Cyprinus carpio fingerlings (2021)
    In:  http://aquaticcommons.org/id/eprint/22064 | 18721 | 2018-02-01 08:51:49 | 22064 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: This study was conducted to investigate the effects of different levels of sangrovit (0, 0.05, 0.1 and 0.15 %) on growth, some of blood biochemical parameters, survival and salinity tolerance capacity in Cyprinus carpio (2.62±0.117 gr). After 45 days of feeding, results showed that growth performance including of weight gain and % specific growth rate improved which fish fed whit sangrovit compared with to control group, but there was no significant differences in growth parameters which fish fed with herbal supplement compared to control group (P〉0.05). There were significant differences in biochemical parameters in fish fed with sangrovit compared to the control group (P〈0.05). The lowest level of cholesterol was observed in 0.05 % group and the highest level of total protein was observed in 0.15 % group. The highest levels of glucose observed in control treatment. In order to determine the effect of the herbal supplement on resistance to salinity stress, salinity stress was carried out after 45 days of feeding. Blood samples were obtained at 24, 72, 120 and 168 hours after stress. Hematocrit had significant difference in each groups (P〈0.05). On the third day after stress, hematocrit levels were decreased in all treatments. Survival and tolerance to salinity stress challenge remained unaffected by dietary supplementation of sangrovit. The results of this study showed that addition of sangrovit to fish diet can improve growth performance and blood biochemical parameters of common carp fingerlings.
    Keywords: Aquaculture ; Chemistry ; Growth ; performance ; Blood ; Sangrovit ; Stress ; Common carp ; Cyprinus carpio ; fingerlings ; biochemical ; parameters ; survival ; resistance ; growth ; fish ; fed ; Iran
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    The effect of density and stocking weight on growth rate and production of grey mullet (Mugil cephalus L.) (2021)
    In:  http://aquaticcommons.org/id/eprint/22065 | 18721 | 2018-02-01 08:53:53 | 22065 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: Around ten thousands fries of Striped grey mullet (Mugil cephalus) with average weight and length of 280 mg and 28.3 mm respectively, imported in March 2008 from Egypt. The wild fries collected from surrounding natural waters of Alexandria. They stocked in four earthen ponds (each with 2500 m2 ) located at the Gomishan shrimp educational centre at late march in 2008. At the first year of culture the densities were 5000 and 10000 individuals per hectare and each treatment with two replicates. At second year, densities changed with 2000 and 2500 individuals per hectares and each of the treatments divided fishes with average primary weights of 80 and 115 grams. They fed twice a day at 8 AM and 2 PM and the amount was 5-7 percents of the fish existent biomass in each ponds. After seven months culture period, the average weight and length of fish in treatment 5000 ind./hec. were 113.7 gr and 21.1 cm respectively and in treatment 10000 ind./hec. the average weight and length were 86.6 gr and 19.6 cm respectively. At first year the average survival rate in different treatments was 77 percent. The average FCR in treatments 5000 and 10000 ind./hec. were 3.4 and 3.9 respectively. At second years after six months culture the average weights in pond no. 9 (with primary weight 115 gr and density 2000 ind./hec) , pond no. 10 (with primary weight 80 gr and density 2000 ind./hec) , pond no. 11 (with primary weight 115 gr and density 2500 ind./hec) and pond no. 12 (with primary weight 80 gr and density 2500 ind./hec) calculated as 476.6 ,338.1, 366.5 and 440 gr respectively. The average survival rate and FCR were 93 % and 3.1 respectively.
    Keywords: Aquaculture ; Grey mullet ; cultivation ; density ; stocking weight ; growth ; production ; Mugil cephalus L. ; weight ; length ; survival ; Iran
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  • 89
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    Determination of nickel and cobalt accumulation in edible tissues of Common carp (Cyprinus carpio) of the Anzali Wetland (2021)
    In:  http://aquaticcommons.org/id/eprint/22062 | 18721 | 2018-02-01 08:45:44 | 22062 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: This study was conducted to measure the accumulation of heavy metals (Co and Ni) in the edible tissues of common carp (Cyprinus carpio) and comparison with international standards of FAO and FDA. Samples were caught from the West, Centre and East part of Anzali Wetland in autumn of 2012. Accumulations of heavy metals were measured by flame atomic absorption spectrophotometer. The level of nickel in the West, Centre and East part of Anzali wetland was in permissible range. Cobalt was not observed in carp fish of western wetland. But, concentration of cobalt was not showed any significant differences compared with standard levels of FDA and FAO in East and Centre parts of wetland (p〉0.05). The results showed that there were not significant differences of the cobalt and nickel in the tissues of carp among stations (p〉0.05). According to the results, carp which caught from Western, Central and Eastern part of Anzali Wetland are suitable for human consumption.
    Keywords: Chemistry ; Fisheries ; Pollution ; Edible tissue ; Anzali ; Cobalt ; Nickel ; Common carp ; Cyprinus carpio ; Determination ; accumulation ; tissues ; Anzali Wetland ; Iran
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  • 90
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    Effective factors on adoption technology among trout fish farms in Guilan Province (2021)
    In:  http://aquaticcommons.org/id/eprint/22071 | 18721 | 2018-02-01 09:13:33 | 22071 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: The main purpose of this study was to investigate effective factors on adopting technologies among trout fish farmers in Guilan province by Unified Theory of Acceptance and Use of Technology (UTAUT). Statistical population of this research contained of all managers of trout fish farms of Guilan province (N=170) that base on limitation of structural equation modelling in determining sample size, 97 of them were chosen as a sample. Study tool was contained Vankatesh and et al. information technology questionnaire in six items. To obtain validity of questionnaire; content, face, convergent and discriminant validity were used. As well, to obtain reliability of questionnaire; principal component analysis, Cronbachs alpha, Dillon-Goldstein’s ʃ and reagent stability were used. To accomplish analysis of data, SPSSV19 and SmartPLSV2 software were used in descriptive and inferential statistics. For testing hypothesis, structural equation model (SEM) and partial least squares (PLS) that focus on reagent variance were used. The results showed that there was significant relationship between performance expectancy and behavioral intention. Also there was significant relationship between intention to use and use behavior of aquaculture technologies. Model explains 28.8 percent of behavioral intention variance and 7.9 percent of use behavior of aquaculture technologies variance among trout fish farmers. To increase willingness to accept the technology among trout fish farms in Guilan province, it is suggested that extension-education courses for raising knowledge and awareness of aquaculture technology to be held by organizations. Providing financial resources and adequate knowledge will enable trout fish farms to equip with the aquaculture technologies.
    Keywords: Aquaculture ; Technology ; Technology Acceptance ; UTAUT Model ; Fish Farms ; Guilan Province ; Iran
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    Study of fish meal substitution with earthworm in diet of rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/22067 | 18721 | 2018-02-01 09:03:23 | 22067 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: This experiment was carried out to evaluate the effect of earthworm (Eisenia fetida) in diet for rainbow trout in a complete randomized design with 5 treatments in triplicates using 15 cages in a pound for 8 weeks. Ten fish with average weight 120 g was stocked in each replication. The earthworm (as fed) at the levels of 0, 25, 50, 75 and 100% was replaced with fish meal in rainbow trout diet. Results showed that feed intake decreased significantly (P 〈 0.05) as earthworm increased. The diets contain 25% and 50% earthworm showed no significant differences compared to control for weight gain, specific growth rate and feed conversion ratio (P 〉 b0.05). The chemical composition analysis of fish meat showed that there were no significant effects between control and 25% and 50% earthworm in diet for dry matter, crude protein and ash, but fat content significantly decreased as earthworm increased (P 〈 0.05). This present study showed that the earthworm (Eisenia fetida) can be used in rainbow trout diet up to 50% instead of fish meal.
    Keywords: Aquaculture ; earthworm ; fish meal ; rainbow trout ; growth ; body ; chemichal ; composition ; Oncorhynchus mykiss ; substitution ; diet ; Eisenia fetida ; earthworm ; levels ; protein ; feed ; growth ; Iran
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  • 92
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    Temporal and spatial variations in percentage cover of macroalgae on rocky shores in South of Caspian Sea (Astara to Babolsar) (2021)
    In:  http://aquaticcommons.org/id/eprint/22068 | 18721 | 2018-02-01 09:05:12 | 22068 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: The most important primary producers of rocky shores are macroalgae. The present study investigated the temporal–spatial changes, the percentage of coverage and the influence of abiotic factors on macroalgae on rocky shores of southern Caspian Sea. Ten sampling stations were selected in the natural and artificial rocky shores from Astara to Babolsar. Sampling lasted for one year and took place every 2 months from September 2013 to July 2014 using a 50×50 quadrate sampler. Epibenthic macroalgae consisted of 2 genus, Cladophora and Entromorpha, from green algae and one genus, Laurenica, from red algae. The average water temperature, salinity, pH, dissolved oxygen and water conductivity were 16.48 °C, 9.87ppt, 8.27, 9.89 mg/l and 16.52 m/s, respectively. According to the results, the maximum algal coverage was observed in September (70.50 %) and the minimum coverage was observed in January (21.50 %). Results of one-way ANOVA indicated that the mean of algal coverage in various months of the year were significantly different (P〈0.05). One-way ANOSIM ecosystem similarity test indicated that the coverage rates of the stations were homologous and similar. The results also showed that temperature has a significant effect on macroalgae coverage ratio on rocky shores in the southern Caspian Sea.
    Keywords: Biology ; Ecology ; Caspian Sea ; Rocky shores ; Macro algae ; Temporal ; variations ; percentage ; Astara ; Babolsar ; Iran ; Cladophora ; Entromorpha ; Laurenica ; genus ; temperature ; ecosystem ; algal
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    Cytotoxic activity of natural components soluble in methanol and diethyl ether of Dysidea pallescens from Hengam Island, Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/22077 | 18721 | 2018-02-01 09:52:46 | 22077 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-25
    Description: Sponges are the most primitive of the multicellular, These organisms don’t have any mechanical defense system, so their early appearance in evolution has given them a lot of time for the development of advanced secondary metabolites as chemical defense system. Sponges have the potential to provide drugs from chemical components against diseases. In this investigation the sponge samples, which it is Dysidea pallescens, were collected at depth of 15- 20 meter, from locations on the coastline of Island Hengam in Persian Gulf of Iran. For identifying natural components, methanol and diethyl ether were used as extraction solvents, after removal of the solvents; the in vitro cytotoxic activity was identified. In vitro cytotoxicity screening, by XTT assay, against KB/ C152 and HUT-78/ C185 cell line, was conducted in this study in 1 - 500 µg/ml. IC50 for diethyl ether and methanol extract was 200 µg/ml in HUT-78, IC50 for diethyl ether extract was 325µg/ml and methanol extract 325µg/ml in KB.
    Keywords: Biology ; Chemistry ; Environment ; Fisheries ; Pollution ; Sponge ; Cytotoxic ; Methanol extract ; Diethyl ether extract ; Hengam Island ; Persian Gulf ; Iran ; Dysidea pallescens
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    The effect of dietary nucleotide on the haematological and serum biochemical parameters of Persian sturgeon (Acipenser persicus) juveniles (2021)
    In:  http://aquaticcommons.org/id/eprint/22075 | 18721 | 2018-02-01 09:43:43 | 22075 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-25
    Description: This study was aimed to examine the impact of different levels of dietary nucleotides (Vannagen) on serum biochemical and blood parameters of Persian sturgeon (Acipenser persicus). Fish (42.37± 2.12 g and 23.67± 0.61 cm) were divided into four treatments with different levels of dietary nucleotides (0, 0.25, 0.35 and 0.5 percent of diet). There were three replicates with a density of 12 fish per tank. After 10 weeks of feeding, serum biochemical and blood parameters were measured. Among the measured factors, blood glucose, triglycerides, cholesterol, erythrocyte and heterophil showed significant differences between the groups fed with nucleotides and the control group (P ≤ 0.05). By increasing the nucleotide levels, the mean heterophil and serum glucose showed significant increase and decrease, respectively. The highest and lowest values of cholesterol and triglyceride were found in groups fed with 0.25% and 0.35% nucleotides, respectively. The other measured factors had no significant difference (P≤0.05). Therefore, it could be said that with regard to the limited capacity of cells to synthesize nucleotides, external preparing of nucleotides could result in the production of needed nucleotides and an increase of its production speed, especially during stress. Such preparation can also improve fish physiology and health status.
    Keywords: Aquaculture ; Chemistry ; Fisheries ; Nucleotides ; Blood factors ; Serum Biochemical Parameters ; Persian sturgeon ; Acipenser persicus ; Juveniles ; Dietary ; Haematological ; Biochemical ; Iran
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    The evaluation of dietary garlic powder on growth performance, survival rate and body composition of Litopenaeus vannamei cultured by Caspian Sea water (2021)
    In:  http://aquaticcommons.org/id/eprint/22121 | 18721 | 2018-02-12 10:51:01 | 22121 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-27
    Description: This study was conducted to evaluate the effects of different levels of garlic powder on growth factors, survival rate and body composition of cultured Litopenaeus vannamei by Caspian Sea water. Four groups of beluga sturgeon with mean weight of 34.20± 0.44 g were raised for 56 days in fiber glass tanks (20 shrimp to each tank) and feeding with different levels of garlic powder with concentrations of 0%, 0.25%, 0.5% and 1.0% (Three replicates were used for each concentration). At the end of the trial, growth factors (Mean weight increased, percent of weight increased, feed conversion ratio and specific growth rate) and body composition were determined and compared with control group. Our results confirmed that shrimp fed on diet supplemented with 1.0 % garlic powder had significantly higher growth factors and survival rate compared to other treatments (P0.05). Based on the results, using of garlic powder, especially at the level of 1.0% in order to improve the growth performance, survival rate and body composition of L. vannamei is recommended.
    Keywords: Aquaculture ; Biology ; White leg shrimp ; Litopenaeus vannamei ; Garlic powder ; Growth ; performance ; Survival ; Body composition ; feeding ; evaluation ; dietary ; Caspian Sea ; Iran
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    Distribution and estimation of washed out seaweeds biomass in Oman Sea coastal waters (2021)
    In:  http://aquaticcommons.org/id/eprint/22132 | 18721 | 2018-07-01 22:28:46 | 22132 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-27
    Description: This study was carried out to determine the seaweed biomass in the coast of Sistan & Baluchestan Province. Beris, Chabahar, Pozm and Tang were introduced as high density zones and Jood & Lipar were selected as low density zones. Among 354.2 km of investigated coastal area, 18.2 km were high density zone and 281.5 km were low density zone. Three transects were fixed in study areas and sampling randomly was done monthly. The samples were measured in area after being cleaned, and separating. During this research, 9 genus were collected. Among these seaweeds, 2 genus were green algae (composed of 2 families and 2 orders), 6 genera of brown algae (composed of 3 families and 3 orders) and 1 genus of red algae. Wet biomass of Sargassum genus in the total area of Sistan & Baluchestan coasts was 445.9 tons in 2012. Among this biomass, 269.1 tons (60.35%) was found in high density area and 176.8 tons (39.65%) in low density zone. The maximum biomass, 270.4 tons (high density zone: 155.5 and low density zone: 114.9 tons) was obtained in December, and the lowest biomass, 3.5 tons was obtained in March.
    Keywords: Biology ; Ecology ; Seaweeds ; Density ; Biomass ; Oman sea ; Iran ; Distribution ; Sistan ; Baluchestan ; Iran
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    The effects of two synbiotics on biochemical and immunological parameters of white shrimp (Litopenaeus vannamei) hemolymph (2021)
    In:  http://aquaticcommons.org/id/eprint/22089 | 18721 | 2018-02-01 10:29:26 | 22089 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-25
    Description: The solution that can also provide nutrients to support the growth of aquatic organisms, increased health, resistance to stress and pathogens are using dietary probiotics, prebiotics and synbiotic in aquatic food. This study aimed to evaluate the performance of commercial and non-commercial synbiotic on hematologic and biochemical parameters of western white shrimp hemolymph was done in 4 treatments including S1 (commercial synbiotic), S2 (non-commercial synbiotic), treatment S3 (combination of commercial and non-commercial synbiotic) and control (C) (witout synbiotic). For commercial synbiotic, a mixture of a commercial Lactobacillus spp. bacteria (at a concentration of 1.5× 106 per g) and mannan oligosaccharide (at a concentration of 1%), and for non-commercial synbiotic, a mixture of a non-commercial Lactobacillus spp. (Lactobacillus plantarum) and mannan oligosaccharide was used. After 2 months of feeding, some of hemolymph indexes such as the number of total haemocytes, and biochemical and immunological parameters such as glucose, total protein, phagocytosis, phenoloxidase and total antioxidant were measured. The results showed that application of the synbiotics (both commercial and non-commercial) could increase the total number of haemocyte significantly (p〈0.05). Immunological indicators and biochemical factors in the shrimp fed with different synbiotics, were better than the control group (p〈0.05). According to the results can mention that application of the synbiotics including mananoligosaccharide and Lactobacillus spp. bacteria, especially if Lactobacillus plantarum was used, has beneficial effects on Immunological indicators of white shrimp.
    Keywords: Aquaculture ; Biology ; Fisheries ; Synbiotic ; Western white shrimp ; Litopenaeus vannamei ; Mannan oligosaccharide ; Lactobacillus spp. ; parameters ; immunological ; biochemical ; protein ; Iran
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    Study on accumulation potential of zinc oxide nanoparticles in Artemia and its trophic transfer to Zebrafish (Danio rerio) (2021)
    In:  http://aquaticcommons.org/id/eprint/22095 | 18721 | 2018-02-02 14:33:19 | 22095 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-06-26
    Description: Although nanomaterials have broad applications in many fields including aquaculture, their release into the environment has raised some concerns in recent years. This study was conducted to investigate the possibility of enriching Artemia with zinc oxide nanoparticles (ZnO-NPs) for possible use in aquaculture on the one hand, and, on the other hand, to investigate the transfer of this material through the food chain and its accumulation in the body of zebrafish as an aquatic model. In order to evaluate the absorption and excretion of ZnO-NPs in Artemia, nauplii were exposed to concentrations of 1, 10 and 100 mg/L ZnO-NPs suspension for 24 hours and then placed in the nanoparticles-free water for another 24 hours. The zebrafish were then fed with ZnO-NPs enriched nauplii for 21 days, followed by feeding on nanoparticles-free nauplii for 7 days to determine trophic transfer as well as excretion of nanoparticles from the fish body. The accumulated zinc over the periods of absorption and excretion in nauplii and fish were measured using atomic absorption spectrophotometer. The results showed that Artemia nauplii had high potential for accumulation of ZnO-NPs, while accumulated zinc had high potential for transfer to fish. Based on the results, Artemia can be enriched with ZnO-NPs so that the needs of fish to zinc can be met. However, the risk of nanomaterials release into the aquatic ecosystems and their trophic transfer along the food chain should be considered.
    Keywords: Aquaculture ; Biology ; Artemia salina ; Danio rerio ; Trophic Transfer ; Zinc Oxide ; Nanoparticles ; Iran ; Zebrafish ; fish
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    Effects of Aloe vera extract on growth indices, carcass composition and bacterial flora in the intestine of Siberian sturgeon (Acipenser baerii) (2021)
    In:  http://aquaticcommons.org/id/eprint/22097 | 18721 | 2018-02-08 02:42:26 | 22097 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-26
    Description: Regarding the beneficial effects and benefits of the herb Aloe vera and its application in various industries such as pharmaceuticals and food industries, this study investigated the effects of Aloe vera extract on growth parameters and bacterial flora of the Siberian sturgeon (Acipenser baerii). In this study, a total of 360 numbers of Siberian sturgeon weighted average 10.95±0.04 (g) randomly distributed in four treatments including a control group and three experimental groups (each with three replications) were used. So, Aloe Vera extract powder ratio of 0.5%, 1% and 1.5% were added to the food. After eight weeks of feeding in the fiberglass vans and physicochemical parameters of water daily registration, biometry carried out and necessary samples collected. In this study, growth indicators such as weight gain, initial body weight, condition factor, feed conversion ratio, specific growth rate, protein efficiency ratio, hepatosomatic index and survival rate were calculated. Results showed that all growth parameters (except hepatosomatic index) in the treatments compared to the control group showed statistically significant differences as a significant difference between the control group treated 1.5% extract were observed (p〈0.05). Each carcass composition parameters, no significant difference was observed between the treatment and control groups (p〉0.05). Meanwhile, total count of bacteria in intestine in the treatment and control groups did not show significant differences (p〉0.05), but significant increase in the count of anaerobic bacteria (lactic acid bacteria) were observed compared to the control group (p〈0.05). The result showed that Aloe vera extract can be effective in improving the growth performance of Siberian sturgeon.
    Keywords: Biology ; Fisheries ; Aloe vera extract ; Growth ; Carcass composition ; Bacterial flora ; Acipenser baerii ; Siberian sturgeon ; Iran
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    Isolation, identification and evaluation of antimicrobial activity of Actinomycetes from marine sediments of Persian Gulf (Hormozgan Province) (2021)
    In:  http://aquaticcommons.org/id/eprint/22100 | 18721 | 2018-02-08 03:01:57 | 22100 | Iranian Fisheries Science Research Institute
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    Publication Date: 2021-06-26
    Description: Actinomycetes are gram positive and filamentous bacteria and produce a major portion of bioactive compounds. The aim of this study was to isolate and identify antibiotic-producing actinomycetes from Persian Gulf marine sediments within Hormozgan province territory. Among 3 selected isolation media the M1 medium showed highest efficacy by isolation of 32 colonies. Heat treatment of 100 ºC for 60 min isolated 26 colonies and showed the best result. Approximately 60 Actinomycete isolates were obtained from 10 sediment samples. Evaluation of antimicrobial activity showed that 33, 20 and 30 % of isolates exhibited antimicrobial activity against S.aureus, E.coli and C.albicans respectively.Morphologic, physiologic and chemotaxonomic studies showed that selected potent isolates consist of Ifro12, Ifro 33 and Ifro 47 belonged to Streptomyces genus. Molecular genetic studies based on 16s rRNA gene analysis revealed that Ifro12, Ifro 33 and Ifro 47 exhibited 99 % similarity to S.olivaceus, S.cacaoi and S.variabilis respectively. Phylogenetic analysis showed that Ifro12 and Ifro 47 derived from a common ancestor. The results of the present research indicated that these three isolates could be considered as promising candidates for antibiotic discovery researches.
    Keywords: Biology ; Chemistry ; Fisheries ; Marine Actinomycetes ; Antimicrobial activity ; Marine sediments ; Persian Gulf ; Hormozgan Province ; Isolation ; Identification ; Evaluation ; Iran
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