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  • 1
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    Infestation biology of Phallusia nigra (Tunicata, Phlebobranchia) on hard corals in a subtropical bay (2019)
    Inter-Research
    Details
    Publication Date: 2019-09-12
    Print ISSN: 0171-8630
    Electronic ISSN: 1616-1599
    Topics: Biology
    Published by Inter-Research
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    PAPER CURRENT
  • 2
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    Benthic invertebrate community in Khur-e-Mussa creeks in northwest of Persian Gulf and the application of the AMBI (AZTI's Marine Biotic Index) (2018)
    Details
    Publication Date: 2021-05-19
    Description: Benthic invertebrates are a well-established target in environmental quality status evaluations. The AMBI (AZTI's Marine Biotic Index) was developed to determine the impacts and the quality status of soft-bottom marine benthic communities. The aim of this study was investigating multivariate pattern of benthic invertebrate community and application of AMBI (AZTI's Marine Biotic Index) for determining quality of health status in Khuzestan coastal waters. Seasonal samplings were collected from eight creeks over one year study by Peterson grab sampler, beginning from October 2005. All creeks are characterized by muddy bottom. According to sensitivity to environmental stress, macrobenthic animals classified into 5 ecological groups. Among 28 identified faunal groups the most abundant groups were polychaets, molluscs, crustaceans and nematodes, respectively. Two way ANOVAs showed only seasonal significant differences in mean abundance (P〈0.05) and Margalef richness index values (P〈0.05), while all of studied creeks shows similar biological characters based on benthic communities. According to annual mean of AMBI value all creeks were in ecological group III with slightly polluted condition, except for Darvish that was in unpolluted category. In the present study, although the number of species initially increased, but due to appearance of dominant species such as Capitella sp. and nematods (as opportunist species), diversity values reduced. In general, according to AMBI and Biotic index values, the most creeks are classified into unpolluted and slightly polluted categories except for Zangy, Doragh and Patil in summer and also Zangy and Bihad in winter which was in moderate to heavily polluted category. Different types of exploitation, industrial and shipping activities in this area could result in unbalanced to polluted status in benthic animals (as the best indicators in sediment quality assessment) so these results can be acceptable.
    Description: Published
    Keywords: Capitella sp. ; AMBI ; Contaminant assessment ; Marine ; Evaluations ; Benthic ; Ecological
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.460-474
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  • 3
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    Short communication: Jellyfish of Khuzestan coastal waters and their impact on fish larvae populations (2018)
    Details
    Publication Date: 2021-05-19
    Description: One of the most valuable groups in the food chain of aquatic ecosystems is zooplankton. A large portion of them are invertebrate organisms with great variety of forms and structure, size, habitat and food value. The term ‘jellyfish’ is used in reference to medusa of the phylum Cnidaria (hydromedusae, siphonophores and scyphomedusae) and planktonic members of the phylum Ctenophora (Mills, 2001). Jellyfish medusa is a zooplankton which is frequently present in coastal ocean waters and all marine habitats. They are also primary predators of other zooplanktons which have significant impact on abundance and diversity of zooplankton communities that are one of the key parts of the marine food web. Most jellyfish include Hydromedusae, Siphonophora and Scyphomedusae and planktonic Ctenophora, especially in the productive warm months (Brodeur et al., 1999). In recent years, the frequency of the jellyfish in many ecosystems has increased (Xian et al., 2005; Lynam et al., 2006).
    Description: Published
    Keywords: Ecology ; Jellyfish ; Fish larvae ; Populations
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.422-430
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  • 4
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    Estimation of Otolithes ruber stock with virtual population analysis in the Northwest area of the Persian Gulf (2019)
    Details
    Publication Date: 2021-05-19
    Description: Stock assessment of Otolithes ruber was carried out using Virtual Population Analysis (VPA) method in the coastal waters of Northwest area of the Persian Gulf. Catch and length frequency data during 2002-2012 were converted to age frequency. The maximum of stock number and biomass were observed in age group 1 and 2, respectively. The minimum stock number and biomass were observed for age group 6. The maximum and minimum catch numbers were in age groups 2 and 6, respectively. The maximum and minimum of weight were in age group 3 and 1, respectively. The maximum and minimum of instantaneous fishing mortality were in age groups 4 and 1, respectively. The maximum fishing mortality was estimated in 2010-2011 and minimum value was in 2002-2003 and 2008-2009. During 2011-2012 the stock number and biomass were estimated 29558 (*10^3 ) specimens, 7302 tones and the catch number and weight were calculated 7562 (*10^3 ), 2364 tones and fishing mortality was obtained 0.47 per year. The calculated parameters showed over-exploitation in age-groups 3 and 4. To preserve stocks and to guarantee sustainable exploitation, the prevention of increasing fishing efforts and the control of fishing activities are crucial.
    Description: Published
    Keywords: Otolithes ruber ; Virtual population analysis ; Stock number and biomass ; Catch number ; Catch weight ; Area
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.296-306
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  • 5
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    Rate, ratio and amount of annual discards in commercial trawl net in northwestern part of the Persian Gulf (Khuzestan Coastal Waters) (2021)
    In:  http://aquaticcommons.org/id/eprint/24991 | 18721 | 2018-11-17 18:24:40 | 24991 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-16
    Description: The main goal of this study was estimating discards of trawl nets in north western part of the Persian Gulf. Data were collected from fishing boats in fishing areas of Khuzestan from October 2011 to September 2012 with collaboration of fishery office. Discard samples include 101 species from 61 families which are 39.5% of commercial catch and 60.4% of non-commercial catches. Rayfish and catfish have been observed in most fishing nets. The average size of bony fishes in discard samples was lower than 15 cm. Total weights of discards was estimated about 1109 tons per year. Total weight of commercial fishes with small size in discards was estimated 2736 tones. The rate and proportion of discards in total catch of trawl was estimated 0.5 and 1.03 respectively. Osteichthyes with 70 species and 50.7% of trawl catch has the highest percentage of discards in trawl nets. High rate of small fishes in commercially important species of discards is probably due to nursery role of Khuzestan coastal waters.
    Keywords: Fisheries ; Iran ; Persian Gulf ; NW Persian Gulf ; Khuzestan Coastal Waters
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 84-99
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  • 6
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    Short communication: Jellyfish of Khuzestan coastal waters and their impact on fish larvae populations (2021)
    In:  http://aquaticcommons.org/id/eprint/23081 | 18721 | 2018-06-17 19:23:29 | 23081 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-12
    Description: One of the most valuable groups in the food chain of aquatic ecosystems is zooplankton. A large portion of them are invertebrate organisms with great variety of forms and structure, size, habitat and food value. The term ‘jellyfish’ is used in reference to medusa of the phylum Cnidaria (hydromedusae, siphonophores and scyphomedusae) and planktonic members of the phylum Ctenophora (Mills, 2001). Jellyfish medusa is a zooplankton which is frequently present in coastal ocean waters and all marine habitats. They are also primary predators of other zooplanktons which have significant impact on abundance and diversity of zooplankton communities that are one of the key parts of the marine food web. Most jellyfish include Hydromedusae, Siphonophora and Scyphomedusae and planktonic Ctenophora, especially in the productive warm months (Brodeur et al., 1999). In recent years, the frequency of the jellyfish in many ecosystems has increased (Xian et al., 2005; Lynam et al., 2006).
    Keywords: Biology ; Fisheries ; Jellyfish ; Fish larvae ; Persian Gulf ; Iran ; Ecology
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 422-430
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  • 7
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    Benthic invertebrate community in Khur-e-Mussa creeks in northwest of Persian Gulf and the application of the AMBI (AZTI's Marine Biotic Index) (2021)
    In:  http://aquaticcommons.org/id/eprint/22528 | 18721 | 2018-04-17 20:15:59 | 22528 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: Benthic invertebrates are a well-established target in environmental quality status evaluations. The AMBI (AZTI's Marine Biotic Index) was developed to determine the impacts and the quality status of soft-bottom marine benthic communities. The aim of this study was investigating multivariate pattern of benthic invertebrate community and application of AMBI (AZTI's Marine Biotic Index) for determining quality of health status in Khuzestan coastal waters. Seasonal samplings were collected from eight creeks over one year study by Peterson grab sampler, beginning from October 2005. All creeks are characterized by muddy bottom. According to sensitivity to environmental stress, macrobenthic animals classified into 5 ecological groups. Among 28 identified faunal groups the most abundant groups were polychaets, molluscs, crustaceans and nematodes, respectively. Two way ANOVAs showed only seasonal significant differences in mean abundance (P〈0.05) and Margalef richness index values (P〈0.05), while all of studied creeks shows similar biological characters based on benthic communities. According to annual mean of AMBI value all creeks were in ecological group III with slightly polluted condition, except for Darvish that was in unpolluted category. In the present study, although the number of species initially increased, but due to appearance of dominant species such as Capitella sp. and nematods (as opportunist species), diversity values reduced. In general, according to AMBI and Biotic index values, the most creeks are classified into unpolluted and slightly polluted categories except for Zangy, Doragh and Patil in summer and also Zangy and Bihad in winter which was in moderate to heavily polluted category. Different types of exploitation, industrial and shipping activities in this area could result in unbalanced to polluted status in benthic animals (as the best indicators in sediment quality assessment) so these results can be acceptable.
    Keywords: Biology ; Ecology ; Pollution ; AMBI ; Contaminant assessment ; Khur-e-Mussa creeks ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 460-474
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  • 8
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    Age, growth and maturity of Hilsa shad (Tenualosa ilisha) in northwestern part of the Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/25074 | 18721 | 2018-11-16 09:03:07 | 25074 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-16
    Description: In this study age, growth and maturity of Hilsa shad in Khuzestan province were analyzed. 394 number of fishes from marine habitat (Lifeh-Boseif), estuaries (Bahmanshir and Arvand) and rivers (Bahmanshir and Karoon) from February 2014 to September 2014 were collected using commercial fishing with gill net. Total length and wet weight of each fish were measured with precision of 1 cm and 1 gram. Sagittal otoliths were extracted for age determination of the fish. Since the otoliths were fragile, they were sectioned by polishing with sandpapers 800, 1500 and 2000. Then abdominal cavity of each sample were opened for determining sex and maturity stage. Growth parameters were calculated using von Bertalanffy growth function (L_∞=58.365, K=0.26, t0=-0.16). Phi-prime constant was obtained 2.95. Length and age at first maturity were obtained 27.32cm and 2.4 g respectively using logistic model to fit a and b parameters with observed data in spawning season.
    Keywords: Biology ; Iran ; Khuzestan province ; Age ; Growth ; Maturity ; Hilsa shad ; Tenualosa ilisha ; Otolith ; Length-weight relationships ; Parameters ; Fish
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 47-58
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