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  • Fish  (4)
  • 2020-2022  (4)
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  • 1
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    Morphometric parameters of the sagitta otolith among four carangids species in the Persian Gulf (2020)
    Details
    Publication Date: 2021-05-19
    Description: Otoliths are considered as very useful structures of fishes for various studies. This investigation aimed to compare the morphometric parameters between the right and left otoliths of male and female specimens of four species of the fishes belonging to the family Carangidae from the northern Persian Gulf. The morphometric parameters such as weight, length, width, area and perimeter of sagittal otoliths were measured and compared between males and females. The relationships between otolith morphometric parameters (length, width, weight) and fork length were also examined. According to the results from independent sample t-test, significant differences were found in length, width, and area of otoliths between males and females of Carangoides malabaricus, whereas no significant differences were found for three other species. The otolith weight of Carangoides coeruleopinnatus and Megalaspis cordyla were significantly different between left and right otoliths (p〈0.05). Likewise, significant differences were found in the otolith area of the right and left otoliths of Carangoides. coeruleopinnatus (p〈0.05). Furthermore, no significant differences were found in the shape indices including form factor (FF), roundness (RD), aspect ratio (AR), circularity (C), rectangularity (R) and elipticity (E) between the right and left otoliths. The results suggest that the length and weight of sagittal otoliths are likely suitable indicators for fish fork length in all studied species.
    Description: Published
    Keywords: Fish ; Otoliths ; Sagitta ; Carangidae ; Shape ; Morphometric
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.547-561
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  • 2
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    An investigation on aquatics diversity and density in marine artificial reef, Moloo area of Bandar-e-Lengeh, Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/23808 | 18721 | 2018-07-27 15:22:16 | 23808 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Over-fishing of marine resources has endangered many commercial fish species in the world. Setting up artificial reefs is now considered an important way for marine stocks and fishing enhancement. The present study was designed to monitor fish abundance and species changes around a small and newly established artificial reef system in Moloo area at Bandar- e-Lengeh during two years after installation in September 2005. The anificial reef includes three types of concrete structures arranged in a seven by three grid. Each cross point was considered as a sampling station and two other stations were also selected from two sides of the system as control points. The CPUE and frequency of fishes in transect 7 with a mixed structure showed significant differences with Other 6 transects (P〈0.01). No fish diversity differences were seen between transects (P〉0.01). Although there were differences CPUE averages of different seasons, the ANOVA test of difference significance was negative. The t-test showed no significant differences between the abundance and of different species per trap per day and seasons. The dominant species were Epinephelus coioides, Plectorhinchus shoran Diagrama pictum, Siganus javus.
    Keywords: Biology ; Ecology ; Artificial Reef ; Fish ; CPUE ; Hormuzgan province ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 129-138
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  • 3
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    Identification and assess anthropogenic impacts on species richness of coral reef fishes in Larak Island, Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/26107 | 18131 | 2019-01-25 10:12:26 | 26107 | Islamic Azad University, Bandar Abbas Branch
    Details
    Publication Date: 2021-07-24
    Description: Coral reefs are amongst the most important and rich ecosystems in the world and are provide habitat for a diverse range of species groups of fishes and invertebrates. Larak Island is one of fourteen islands found in the Persian Gulf which was selected for this study. The reef fish distribution around this island was identified and then for sampling, six stations were randomly selected by Manta Tow method. The identification was conducted using visual census technique in all stations. A total of 54 species belonging to 42 genera and 23 families were identified and amongst them the abundant species group belonged to family Pomacentridae with 11 species. The results indicated that further the stations were from an urban area higher species richness was.
    Keywords: Biology ; Conservation ; Ecology ; Coral reef fishes ; Fish ; Fish community ; Species richness ; Anthropogenic impacts ; Pomacentridae ; Larak island ; Persian Gulf
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-5
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  • 4
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    Ecological interaction between commercial fishes in the Persian Gulf (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25473 | 18721 | 2018-09-26 09:53:23 | 25473 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: An ecosystem-based management fishery is a new way of looking at management of living resources. Trophic levels of basic food items, feeding habits, growth and mortality rate of 20 exploited fish species (including commercial and bycatch) are investigated in the Persian Gulf (from the provinces of Khuzestan, Bushehr and Hormozgan) from 2010 to 2012. The model considers trophic interactions among 12 functional group of the ecosystem involving Phytoplankton, Zeoplankton, Cephalopods, Shrimp, Infauna Benthos, Epifaunal Macrobenthos, Demersal Zoobenthos Feeders, Small Pelagic Planktivorous Fish, Benthoplagic Feeder, Piscivorous, Large Benthic Carnivores And Small Benthic Carnivores. In general 7452 of stomach contents samples were analyzed based on the weight and numerical method and were detected about 40 preys. The results demonstrated gaps in our knowledge on the food web structure. The mean trophic levels were varied from L. klunzingeri (2) to S. tumbil (4.64), while the total catch of some species were fluctuating widely. Result of our study showed that Total mortality varied between 0.45 per year (A. suppositus) to 9.5 per year (P. indicus) and food consumption rate also fluctuated by 1.9 (L. johni ) to 89 (L. lineolatus). The results indicated that some fish species including sardine, Anchovies, small carangids, S. stridens with high frequency in ecosystem, have been occupied in the food web as a wasp-waist. The model showed that most hunters groups live in middle levels in the food web such as N. japonicas, A. latus, P. kaakan, L. nebolusus, P. indicus and T. lepturus . Analysis the catch rate during 2001-2011 reveled that there is a clear trend of declining most of fish species catches in this research except for T. lepturus, P. kaakan and sparids which lead to upset the fundamental ecological balance of the Persian Gulf in future.
    Keywords: Ecology ; Iran ; Persian Gulf ; Trophic level ; Functional group ; Prey ; Trophic interaction ; Fish
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 131
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