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  • 1
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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
    Details
    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
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 41-50
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  • 2
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    The effect of monsoon on fish larva assemblage changes in Gowatr Bay, North Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22697 | 18721 | 2018-05-16 18:28:55 | 22697 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-09
    Description: The study and research of abundance and diversity variation of fish larva (Ichthyoplankton stages) was done in Gowatr Bay during autumn 2006 - summer 2007. Five stations were selected for sampling, and Bongo-Net with 300µ mesh size was towing from bottom to surface. During of survey, totally 531 larvae belong to 11 families were collected and identified. The mean abundance estimated 12.17 larvae per 10 m^2, in which three fish larva family including: Gobiidae, Clupeidae and Engraulidae were dominant (86% of relative abundance). The result showed that there was significant differences between pre and post-monsoon fish larvae abundances (p〈.05), and there were not significant differences between stations (p〉.05). In pre-monsoon 4 families were identified of which Clupeidae introduced as indicator group, whereas in post-monsoon 10 families were identified and Gobiidae was indicator family, accompany with increase of diversity. PCA result was shown, temperature as the main factor affected on fish larvae assemblage was found with a significant decrease of 11.9 °C after monsoon phenomenon.
    Keywords: Biology ; Fisheries ; Fish larva ; Indicator family ; PCA ; Monsoon ; Gowatr Bay ; Oman Sea ; Iran ; abundance ; Ichthyoplankton ; mesh size
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 427-436
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  • 3
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    Short communication: Ecological larval fish groups in Chabahar Bay in relation to day/night and monsoon variations (2021)
    In:  http://aquaticcommons.org/id/eprint/22977 | 18721 | 2018-06-08 22:18:10 | 22977 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-12
    Description: Studies on larval fish abundance allow important inferences about the spawning grounds, reproduction season and migration pattern of fishes. Larval densities can also be used to estimate the abundance index, which in turn can be correlated to the fisheries yield, and provide an alternative approach for measuring the size of the spawning stock. Previous studies in this ecosystem have focused on the abundance of fish larva without consideration of daily fish larva variations. ... In this research we consider the monsoon as an important phenomenon, affecting the daily fish larval distribution.
    Keywords: Biology ; Ecology ; Environment ; Fisheries ; Larval fish ; Ecological groups ; Day/night ; Monsoon ; Ecology ; Chabahar Bay ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 1609-1615
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  • 4
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    Species identification of Sillaginid larvae (Perciformes: Sillaginidae) in the central creeks of Bushehr Province – Persian Gulf using morphological and DNA barcoding methods (2021)
    In:  http://aquaticcommons.org/id/eprint/22092 | 18721 | 2018-02-02 14:19:32 | 22092 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-25
    Description: Sillaginids are one of the important fishes in coastal waters of Persian Gulf, whose larvae of different species are morphologically very similar to each other and identification of them to species level is very difficult. In this study a total of 4195 Sillaginidae larvae were collected from five inlets (Shif, Lashkari, Ramleh, Dubbeh, Farakeh) and one sampling site in the coastal area of Bushehr Province using a Bongo-net. Morphological and genetic methods were used to identity larvae of this family. The larvae were morphologically divided into two groups, depending on 34 or 38 myomers. The larvae with 34 myomeres were identified as Sillago sihama. To identify larvae with 38 myomers, 12 individuals of postflexion larvae were selected and the morphological characteristics such as number of dorsal and anal fins as well as DNA barcoding of COI were used. According to morphological characteristics, the larvae were divided into two species; Sillago arabica and Sillago attenuata. Genetic studies were done by sequencing of 625 base pair of COI gene. Genetic distances calculated using K2P model between these two species was 18% to 19.7% which indicate that DNA barcoding confirms morphological method and it can be used for identifying younger larvae whose fin rays have not been developed and are unidentifiable with morphological methods.
    Keywords: Biology ; Fisheries ; cytochrome oxidase subunit I ; fish identification ; Sillago arabica ; Sillago attenuata ; Sillago sihama ; Iran ; Bushehr province ; Persian Gulf ; DNA ; Species ; identification
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  • 5
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    Distribution pattern of coral & non coralline fish larvae in Khark & Kharko (Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/22364 | 18721 | 2018-03-28 22:09:25 | 22364 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: Khark and Kharko Islands are located at far northern point of fringing coral reefs in the Iranian coast of the Persian Gulf. These coralline are the habitats of the wildlife refuge with total area of 2400ha and located in the territory of Bushehr province. The present study was carried out from July 2006 to June 2007 over 12 stations. Sampling was conducted obliquely from bottom using Bongo-net plankton sampler with 500µ of mesh size. In total, 1808 specimens, both in pre and post flexion stages were collected and examined. They were belonging to 45 families from different ecological groups (21 coralline and 24 non coralline fish larvae families ). 96% of examined fish larvae were in preflexion stage. Some families are new ones from the area . Among identified families, Clupeidae, Blenniidae, Sillaginidae, Atherinidae and Tripterygiidae were dominant families in studied area and the peaks were estimated in spring. The mean abundance of total fish larvae was 18.71 per 10m² of sea surface. The most abundant families were Clupeidae, Sillaginidae, Blenniidae, Atherinidae and Tripterygiidae in which comprised 65% of fish larvae. Abundance in spring showed significant difference with other seasons. The distribution pattern of fish larvae changed seasonally in both groups, increasing in east coasts of Khark Island and in three coastal stations during summer and autumn and in west coast of Khark in spring. The distribution of fish larvae seemed to be correlated to sea currents.
    Description: Article includes abstract in Farsi on last page.
    Keywords: Biology ; Fisheries ; Coralline fish larvae ; Abundance ; Khark and Kharko Islands ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 173-184
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  • 6
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    Identification of Plathycephalidae species in Bushehr Province waters (Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/23905 | 18721 | 2018-08-01 16:03:42 | 23905 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: During the conducted cruises for implementation of projects entitling, "Studying Shrimp Nursery in Bushehr Esturies" and "Assessment of Bentic Stocks through Swept Area Method" in Iranian waters of the Persian Gulf, some samples of aquatics were collected. Among the collected samples the species belonging to Platycephalidae were identified in the region and are included: Platycephalus indicus, Grammoplites suppositus, Grammoplites scaber G. suppositus had more abundance than two other species (56%) and P. indicus had the largest size of total length.
    Keywords: Biology ; Fish ; Species ; Identification ; Abundance ; Bentic ; Area ; Plathycephalidae ; Platycephalus indicus ; Grammoplites suppositus ; Grammoplites scaber ; Grammoplites suppositus ; Bushehr province ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 33-48
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  • 7
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    Ecological study on fisheries important rivers and bays in the south part of the Caspian Sea 2nd phase: Gorgan Bay (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25385 | 18721 | 2018-09-18 05:58:09 | 25385 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: In this study ichthyoplankton, phytoplankton, zooplankton, benthic and hydrochemistry parameters were studied. 9 out of 11 sampling stations were in the Gorgan Bay area and 2 of them were in the mouth of the Bay. Ichthyoplankton survey were carried out in 6 stations and the other surveys such as phytoplankton, etc were done in 11 stations in 2009. Gorgan Bay map and position of sampling sites are given at the end of material and methods section. Biomass and frequency of phytoplankton at different stations, months and seasons were calculated that are presented in Tables 1 to 3. Hydro-chemical parameters such as water temperature, air temperature, visibility, DO, BOD5, pH, Alkalinity (bicarbonate, carbonate and total), Hardness (calcium, magnesium), CL,EC, Salinity, N (nitrate, nitrite, NH_3), Phosphate were measured and results are shown Table 11. Biomass (mgr/m^3) and numbers (ind./m^3) of 47 genus of different phylum of phytoplanktons such as Cyanophyta, Chlorophyta, Pyrophyta, Chrysophyta and Euglenaphyta as well as different phylum of zooplanktons consist of Protozoa, Arthropoda, Rotifera and Cyliophora were estimated. Frequency of phytoplanktons (ind/m^3) was 131.2, 1.6, 65.3, 18.9 and 23.8 million respectively. Furthermore, their biomass was 308.4, 1.9, 1358.9, 295.1 and 124.7 mg/m^3, respectively. The maximum and minimum numbers were observed in Leptolingbaya belonged to Cyanophyta and Diatoms of Chrysophyta 84.3 and 0.025 million (ind/ m^3) respectively. The maximum and minimum biomass was observed in Gyrosigma (Chrysophyta) and Tetradron (Chloropyta), 12317.3 and 0.014 mg/m3 respectively. The average biomass of zooplankton was measured 531.74, 30.77, 225.07, and 96.26 mg/m^3 respectively and the total was attained 883.83 mg/m3 Table 5. The maximum and minimum biomass of all zooplanktons was estimated in November and July, 3446.23 and 6 mg/m^3 respectively. Furthermore, the maximum and minimum numbers of zooplanktons were found in September and July which were 48.4 and 0.002 millions respectively and the average number was 8.4 ind/m^3 Table 4. Also numbers and biomass (gr/m^2) of 11 families of benthos which inhabit Gorgan Bay such as Annelida, Mollusca and Arthropoda were investigated in separated stations and distinctive months. The maximum and minimum biomass of benthos was observed in January (42.91 gr/m^2) and March (0.6428 gr/m^2). The biomass was considerable in April, February, August and December (Tables: 4, 5 and 6).
    Keywords: Ecology ; Iran ; Caspian Sea ; Gorgan Bay ; Ecological study ; Fisheries ; Ichthyoplanktons ; Phytoplankton ; Zooplankton ; Benthic ; Sampling ; Biomass ; Temperature ; Visibility ; pH ; Alkalinity ; Salinity ; Phosphate ; Cyanophyta ; Annelida ; Mollusca
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 97
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  • 8
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    Isolation and screening of antibacterial and enzyme producing marine actinobacteria to approach probiotics against some pathogenic vibrios in shrimp Litopenaeus vannamei (2021)
    In:  http://aquaticcommons.org/id/eprint/22898 | 18721 | 2018-06-05 22:30:52 | 22898 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-11
    Description: The application of new probiotics is a good strategy in the biological control of infectious diseases in aquaculture. Approximately 100 marine actinobacteria isolates were obtained from 10 sediment samples of shrimp farms. Heat treatment of sediment samples resulted in a selective reduction of the non actinobacterial heterotrophic microflora. Starch nitrate agar medium exhibited more efficacy than glycerol arginine agar medium for isolation. Twenty seven percent of actinobacterial isolates showed antagonistic activities against pathogenic Vibrio spp. All the antagonistic isolates showed the typical morphology of genus Streptomyces. Exoenzymatic activity screening showed that 44%, 26%, 37% of antagonistic isolates represented amylase, lipase and protease activities, respectively. MNM-1400 strain exhibited highest antagonistic and exoenzymatic activity. The pathogenicity experiment revealed that MNM-1400 strain did not cause disease in Litopenaeus vannamei larvae. Extraction of produced antibacterial compounds by MNM-1400 strain showed that the active constituent didn’t have non polar property. Morphological, physiological and biochemical identification confirmed that MNM-1400 strain belonged to the genus Streptomyces. Phylogenetic analysis by 16S rRNA gene sequencing showed a high similarity between MNM-1400 strain and Streptomyces californicus (similarity: 99%). These results suggest that the MNM-1400 strain can be considered as a potential probiotic in aquaculture.
    Description: Issue number on first page of article is incorrect; should be 15(2), not 15(1).
    Keywords: Aquaculture ; Biology ; Fisheries ; Probiotic ; Marine actinobacteria ; Biological control ; Shrimp ; Litopenaeus vannamei ; Biotechnology ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 630-644
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  • 9
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    Allometric growth pattern and morphological changes of green terror Andinoacara rivulatus (Günther, 1860) (Cichlidae) during early development: Comparison of geometric morphometric and traditional methods (2021)
    In:  http://aquaticcommons.org/id/eprint/23031 | 18721 | 2018-06-15 18:58:36 | 23031 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-12
    Description: Allometric growth pattern and body shape changes of the Green terror (Andinoacara rivulatus) (Cichlidae) were studied using landmark-based geometric morphometric (GM) and traditional methods, from hatching up to 1266 Hours Post Hatching (HPH) under culture conditions. The left side of specimens were photographed using digital camera and morphometric characters, including total length, head length, tail length, trunk length, eye diameter, snout length and body depth were measured using ImageJ software. In GM method, ten landmark-points were digitized on 2D pictures. Allometric growth patterns were calculated as a power function of total length and described by the growth coefficient to reveal important steps in the species’ early life history. The scores of relative warp analysis (RW) were used as descriptors for the variation in shape. The growth patterns obtained by both traditional morphometric (TM) and GM methods showed similar patterns, but GM showed effective results to interpret the morphological changes and revealing larval stages based on the body shape change. The results also showed higher growth rate of head and tail regions up to yolk sac absorption following by isometric patterns, after begin of exogenous feeding. Based on the findings, the early development of this species can be divided into five stages based on its morphology, including newly hatching larvae (up to 48 HPH), younger larvae (156 HPH), older larvae (426 HPH), younger juvenile (666 HPH) and juveniles. The results confirmed this fact that morphological development and growth patterns during early life stages in A. rivulatus closely match its immediate required function.
    Keywords: Biology ; Aquarium ; Relative warp ; Ontogeny ; Morphometrics ; Andinoacara rivulatus ; Iran
    Repository Name: AquaDocs
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    Format: 222-237
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  • 10
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    Community composition and diversity of zooplankton in the northwest Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/23112 | 18721 | 2018-06-17 20:25:13 | 23112 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-12
    Description: Survey on zooplankton composition was studied during June 2015 to March 2016, by selecting six stations along the coastal waters of Bushehr (the Northwest Persian Gulf). Twenty four zooplankton taxa were identified, and the different zooplankton groups represented twenty-one families. Copepoda was recorded with the most abundance (53.30 %) followed by Malacostraca (32.87 %), which in turn was followed by Sagittoidea (7.44 %) and Appendicularia (6.39%). A major peak of 189.34 N/m3 was observed in February-2016 with 53.25% contribution from Copepoda. Among Copepoda, Labidocera sp. was the major contributor to this peak. Appendicularia was the comparatively less represented group, being chiefly represented by Oikopleura dioica. Labidocera sp., Oithona plumifera which were common in most of the stations. This common distribution were observed for Malacostraca, namely Lucifer hanseni (mysis I), Upogebia sp. (zoea I), Parthenope sp., Ilyoplax frater( zoea VI), for Sagittoidea, namely Sagitta enflata, Sagitta neglecta and for Appendicularia, namely Oikopleura dioica. The mean Shannon's diversity index (H') and evenness were 1.36±0.43 and, 0.68±1.17, respectively. The highest Margalef's index was recorded in station-6 (2.72±1.32) and the lowest in station-2 (1.98±0.89). According to non-significant differences between temporal and spatial zooplankton density and Shannon’s index, from an ecological point of view, it seems the study area is unique and the zooplankton composition is homogenous.
    Keywords: Biology ; Ecology ; Zooplankton ; Density ; Diversity ; Persian Gulf ; Bushehr Province ; Iran
    Repository Name: AquaDocs
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    Format: application/pdf
    Format: 722-732
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