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  • 1
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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
    Details
    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
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 145-155
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  • 2
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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
    Details
    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
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 109-117
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  • 3
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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
    Details
    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
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 311-320
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  • 4
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    Reproductive biology of Cobitis keyvani (Cobitidae) from the Talar River in the southern Caspian Sea basin (2021)
    In:  http://aquaticcommons.org/id/eprint/22521 | 18721 | 2018-04-17 20:02:21 | 22521 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: Some aspects of the reproductive biology of Cobitis keyvani (Mousavi-Sabet, Yerli, Vatandoust, Ozeren and Moradkhani, 2012), an endemic Loach fish species from the Talar River in the southern Caspian Sea basin, in north of Iran was studied by regular monthly collections throughout a year. Fecundity, condition factor, gonado-somatic, modified gonado-somatic and Dobriyal indices were estimated. Regression analyses tested the dependence of fecundity on fish length, weight, gonad weight and age. Significant differences were observed between the total number of females and males, females being more abundant. The mature females and males were longer than 49 and 45 mm in total length, and +2 and +1 in age, respectively. The average egg’s diameter was 0.56 mm. The spawning of Cobitis keyvani from Talar River took place from May to late July, when the water temperature is between 18.7 to 24.0°C. At the beginning of the reproduction period, the average GSI values were 10.09%, ranging from 6 to 25% in ripe mature females. The absolute and relative fecundity were 2211 and 586 respectively. The absolute fecundity was significantly related to body weight and gonads weight. Based on the gonado-somatic and Dobriyal indices, it was concluded that the fish has a prolonged active reproductive period. Their long reproductive activity and high range of fecundity are types of adaptation by short-lived small fishes to environmental conditions.
    Keywords: Biology ; Fisheries ; Gonado-somatic index ; Dobriyal index ; Spawning ; Condition factor ; Fecundity ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 383-393
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  • 5
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    Stock identification of Arabian yellow fin sea bream (Acanthopagrus arabicus) using shape of otolith in the Northern Persian Gulf and Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/26444 | 18721 | 2019-05-06 10:09:04 | 26444 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    Description: Otolith shape analysis is one way to identify stocks of different fish species in the marine environment. Length, width, area, perimeter, form factor, aspect ratio, roundness, circularity, ellipticity and rectangularity analyses of otoliths were undertaken to assess patterns of spatial and temporal stock structure of a wide-ranging fish, the Arabian yellow fin sea bream Acanthopagrus arabicus. Fish were sampled from 125 stations across the distribution range of the species in the Northern Persian Gulf and Oman Sea from June 2014 to May 2016. Analysis of morphometric parameters of otolith showed the minimum size in Khuzestan waters and the West Strait of Hormuz and the maximum size in the East Strait of Hormuz. In Bushehr waters, form factor showed the lowest and circular factor showed the highest frequency. These findings are in agreement with the irregularity in otolith margin of this area. The highest aspect ratio of otolith indicated higher growth in Khuzestan Waters. The thinner and longer otoliths were identified in the East Strait of Hormuz region. Further, rectangularity ratio factor in the Bushehr and West Strait of Hormuz waters was higher in comparison with other regions and this finding confirmed the quadrilateral otolith shape of this region. There are significant differences among otolith morphometric variables of the A. arabicus (p〈0.05). The result of discriminant analysis on morphometric parameters indicated that 53/8 percent were in their geographic location accurately.
    Keywords: Biology ; Fisheries ; Shape otolith indices ; Stock identification ; Acanthopagrus arabicus ; Northern Persian Gulf and Oman Sea
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 60-70
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  • 6
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    Age, growth and mortality of the Persian sturgeon, Acipenser persicus, in the Iranian waters of the Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21696 | 18721 | 2017-11-27 11:59:31 | 21696 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-28
    Description: The age and growth of the Persian Sturgeon, Acipenser persicus, obtained from the Iranian coastal waters of the Caspian Sea, were studied through analysis of the pectoral fin ray section from 180 specimens, ranging in fork length (FL) from 66 to 203 cm. The specimens were obtained from commercial fisheries between October 2008 and June 2010. Interpretation of growth bands in the pectoral fin ray sections was carried out objectively using the direct reading of thin sections and image analysis. The maximum age recorded in this study for the spacimens of Persian Sturgeon was 39 years. The von Bertalanffy growth parameters estimated for females were greater than for males. The estimates of asymptotic length (L∞) and growth coefficient (K) of females were 173.07 cm and 0.1 year -1, respectively and for males 164.33 cm L∞ and 0.08 year -1 K respectively,. Total mortality coefficient (Z) for females and males was estimated to be 0.45 and 0.76 year -1, respectively. This study revealed differences in life history parameters of the Persian Sturgeon compared with those of previous studies, which may be associated with the current increased fishing pressure and degradation of environmental conditions.
    Keywords: Biology ; Fisheries ; age ; growth ; mortality ; Persian sturgeon ; Acipenser persicus ; Iranian waters ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 159-167
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  • 7
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    Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin (2021)
    In:  http://aquaticcommons.org/id/eprint/21705 | 18721 | 2017-11-27 13:49:39 | 21705 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-28
    Description: Cobitis faridpaki Cobitis faridpaki (Mousavi-Sabet, Vasil'eva, Vatandoust and Vasil'ev, 2011) is found in streams of the Siahrud River in the southeastern Caspian Sea basin, and this is the first report on reproductive parameters of the newly described endemic loach. Reproductive conditions are key parameters of fish populations, and their assessment is very important for endemic fishes. To study reproduction biology of this fish, sampling was done at monthly intervals throughout the year and 258 individuals of Cobitis faridpaki, were caught from Siahrud River in the southeastern Caspian Sea basin, in the north of Iran. Age, sex ratio, fecundity, oocytes diameter and gonadosomatic index were estimated. A regression analysis was used to find relationships between fecundity and fish size (length and weight), gonad weight and age. Sex ratio differed significantly from unity and was biased to females. The mature females and males were longer than 40 and 30 mm in total length, and +2 and +1 in age, respectively. The average egg diameter was 0.578 mm. Spawning took place from beginning of May to late July when water temperature was between 19.4 to 25.1 °C. Average GSI value at the beginning of the reproduction period was 9.12% and ranged between 2% to 20% in ripe mature females. The averages of absolute and relative fecundity were calculated as 1366 and 508, respectively. The absolute fecundity was significantly related to body weight and gonad weight. Based on the pattern of gonadosomatic index, it was concluded that this fish has a prolonged active reproduction period, which is a type of adaptation of short-lived small fishes to environmental conditions.
    Keywords: Biology ; Fisheries ; age ; sex ratio ; spawning ; gonadosomatic ; fecundity ; Cobitis faridpaki ; Siahrud River ; Caspian Sea ; Iran ; parameters ; fish
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 15-23
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  • 8
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    Morphometric and meristic variations in bream (Abramis brama orientalis, Berg, 1949) during larval development (2021)
    In:  http://aquaticcommons.org/id/eprint/21753 | 18721 | 2017-11-30 04:37:30 | 21753 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-30
    Description: This study was conducted to examine morphometric and meristic characteristics alongside pigmentation patterns of bream larvae, Abramis brama orientalis, in four stages of larval development. Morphological characters including total length (TL), standard length (SL), notochord length (NL), head length (HL), head depth (HD), eye diameter (ED) and mouth width (MW) were examined from hatching time through 30 days after hatching (DAH). The results showed morphometric variations in the different larval stages. Growth and development of fins occurred mainly at the Post Flexion stage with the completion of caudal fin at 9 mm TL and pelvic fin at 13.33 mm TL. At all larval stages, the highest concentration of pigments was seen on dorsal, ventral and somewhat on the lateral sides of body in descending order. The highest density of melanophores at larvae yolk sac stage was observed on the yolk sac and the back of head zone, while at preflexion and flexion stages melanophores were dominant on the back of head and on the skin folds which resulted from yolk absorption. At post flexion stage, high density of melanophores was found on the back of the head, bases of fins and caudal fin, while less concentrations of these cells were evident on the lateral sides of fish' body. In conclusion, a clear change in the growth and main morphological characters were observed in postflexion stage. This may be due to the main development of fins, which would suggest enhanced swimming capabilities and also prey capture efficiencies.
    Keywords: Biology ; Fisheries ; Abramis brama orientalis ; morphometry ; larval development ; meristic ; variations ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 89-97
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  • 9
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    Investigating of the long-term and short-term effects of rainfall changes on the value added of Iranian aquaculture and fisheries sector (2020)
    Details
    Publication Date: 2021-05-19
    Description: Human economic activities have caused many environmental impacts that can be attributed to climate change as the most important side effects. One of the components of climate change is the change in rainfall pattern, time and space distribution of rainfall, and also the reduction of rainfall. Considering the importance of water inputs in economic activities, especially agriculture and fisheries, in the present study, the effect of rainfall change on the value added of the fisheries sector in the short and long term has been studied. For this purpose, the Auto-Regressive Distributed Lag model (ARDL) has been used. The results of this study indicate that rainfall in the short and long run has a positive and significant effect on the added value of the fisheries sector. Rainfall by improving access to surface water and groundwater resources has indirect effects on improving the value added of the fisheries sector. According to the results, it is suggested that fish catch limits be applied in critical areas affected by climate change. Also, in order to adjust and adapt the country's aquaculture sector to shocks caused by rainfall and climate change, the field of technology and production improvement should be provided through providing banking and financing facilities.
    Description: Published
    Keywords: Climate Change ; Rainfall ; Fisheries ; Technology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.57-66
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