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  • 1
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    Short communication: Identification of by-catch species of tuna purse seiners in Iranian waters of Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/23187 | 18721 | 2018-06-19 15:48:05 | 23187 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-13
    Description: One of the most visible direct impacts of fishing is the capture of non-target species, known collectively as by-catch. By-catch includes species that are unwanted and discarded (discards) and species that are retained and sold (byproduct) (Stobutzki et al., 2003). Although tuna purse seine fisheries have been shown to be selective, leading to lower levels of by-catch than other fisheries (Alverson et al., 1994; Kelleher, 2005), several species can be incidentally caught and, in some cases, discarded at sea. These include vulnerable and sensitive species such as turtles, mammals, and sharks (Minami et al. 2007; Romanov, 2008b). Tuna purse seine fisheries probably apply the most intensive direct human impact on the tropical epipelagic ecosystems in all oceans. Because of the worldwide scale of purse seine fisheries, an assessment of their impact on associated and dependent species is essential (Romanov, 2002a).
    Keywords: Fisheries ; By-catch ; Tuna ; Purse seine ; Oman Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 239-243
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  • 2
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    Growth parameters and mortality rates of Liza klunzingeri in the Iranian waters of the Persian Gulf and Oman Sea, using Length Frequency Data (2021)
    In:  http://aquaticcommons.org/id/eprint/22357 | 18721 | 2018-03-27 19:32:08 | 22357 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: The aim of the present study was to investigate the population dynamics of Liza klunzingeri, in Hormouzgan province waters located in northern coasts of the Persian Gulf and Oman Sea. This study was carried out from October 2007 to September 2008. Samples were collected from commercial stake traps. The relationship between weight and fork length was found to be W= 0.0214 F.L^2.8233 suggesting that Liza klunzingeri shows isometric growth. Length-based stock assessment using the FiSAT software package showed an asymptotic length (L∞) of 20.3cm FL and growth coefficient of 0.6.yr^-1. These results gave a growth performance index (ø) of 2.39. The total mortality coefficient was estimated to be 2.31, a natural mortality of 1.09 and fishing mortality of 1.22. The estimated total mortality which, in relative terms, is considered average (2.31.yr^-1), coupled with the currently observed exploitation rate of 0.52 for L. klunzingeri, estimated from the mortality rates, suggested that the species is moderately exploited.
    Description: Article includes abstract in Farsi on last page.
    Keywords: Biology ; Fisheries ; Keeled mullet ; Liza klunzingeri ; Growth ; Mortality ; Iranian waters ; Persian Gulf ; Oman Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 87-96
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  • 3
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    Relative growth of the fiddler crab, Uca sindensis(Crustacea: Ocypodidae) in a subtropical mangrove in Pohl Port, Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/22629 | 18721 | 2018-05-07 18:52:12 | 22629 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-08
    Description: The relative growth of the fiddler crab Uca sindensis in Pohl Port was studied. Ten 0.5 m^2 quadrates were randomly sampled monthly during low tide periods from October 2009 to September 2010. A total of 840 crabs, 449 (53.45%) males and 391 (46.5%) ‌ females, were sampled. The Carapace width of males ranged from 5.5 to 13.5 mm (mean ± SD) (8.92 ± 2.04), and of females from 5.0 to 11.5 mm (mean ± SD) (7.95 ± 1.34). Carapace height (CH) and Carapace length (CL), height of the major cheliped (HMC) of males, abdomen width of females (AW), major cheliped length (LMC), dactiluse (D), feeding cheliped (CHF) and merouse (M) were employed as dependent variables and carapace width (CW) as independent variable. The relationship between CW × CH was positive in males and females. The equation (Log CH=Log-4.881+4.681LogCW) for males (P〈0.05) and Log CH=Log-1.882+3.299LogCW for females (P〈0.05). The females showed allometric positive growth for CW × AW relation to male (Log AW= Log0.784+1.217Log CW) (P〈0.05). Also four male crabs were found with two major cheliped in this study. Remarkable ontogenetic changes were observed in the allometric growth of the male major cheliped and the female abdomen, indicating that these structures are closely connected to the timing of sexual maturity. The allometric growth of U. sindensis in Pohl Port mangrove differed from other Uca populations so far studied, indicating that growth could have been influenced by environment variables such as food availability, population density, distribution of vegetation, sex ratio, soil temperature , organic matter, different of surface and sediment.
    Description: Issue and number on title page is incorrect: should be 12(3), not 12(2).
    Keywords: Biology ; Fisheries ; Fiddler crabs ; Uca sindensis ; Relative growth ; Carapace width ; Allometry ; Abdomen width ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 639-653
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  • 4
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    Estimation of population dynamics parameters of Scomberomorus commerson using modal progression method in the Hormouzgan province waters (2021)
    In:  http://aquaticcommons.org/id/eprint/23800 | 18721 | 2018-07-27 15:04:01 | 23800 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Scombermorus commerson is one of the most important commercial fish species in the Persian Gulf and Sea of Oman. To arrange for a sustainable fishing pattern, growth parameters, mortality and exploitation rates of the fish were estimated. Fish length data were collected from 4515 fishes, science April 2007 to March 2008 in three major artisanal fish-landing sites Bandar Lengeh, Bandar Abbas and Bandar Jask in Hormouzgan province waters. The Von Bertalanffy growth parameters (L∞ K and t _(0)) were estimated at 150.24 (cm), 0.66 year ^(-1) and -0.157 year, respectively. The results showed that S. commerson grows very fast in the first 2 years. The results indicated that S. commerson attains its fork length 80.3 cm at the end of first year. The fork length attained at the end of the second, third and fourth years were 114.1, 131.6 and 140.6 cm, respectively. Growth performance index (f) was calculated at 4.1 which were in agreement with the findings of the other studies in the Indian Ocean. Total, natural, fishing mortality and exploitation rate were estimated at 2.11, 0.67, 1.44 year ^(-1) and 0.64, respectively. Five cohorts were distinguished based on Bhattacharya's method.
    Keywords: Fisheries ; Scombermorus commerson ; Population dynamics ; Oman ; Oman Sea ; Persian Gulf ; Indian Ocean ISW ; ISW ; Hormozgan province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 53-66
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  • 5
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    Reproductive biology of jinga shrimp (Metapenaeus affinis) in coastal waters of Hormozgan Province, southern Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/24256 | 18721 | 2018-08-03 13:28:03 | 24256 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The main goal of this study was to understand the reproductive biology of Jinga Shrimp (Metapenaeus affinis) that is found in coastal waters of Hormozgan Province and is relatively unknown to the scientific community. To achieve this goal, we conducted a monthly sampling over the years 2001 to 2003 sweeping a long area from Bandar Abbass to Sirik in the south of Iran.We found that the sex ratio is not 1:1 either seasonally (except in autumn 2001) or annually (p〈0.05). The peak of spawning of the shrimp observed in spring and also calculated the carapace length of female shrimps at first maturity (LM50) as 27.16mm.
    Keywords: Biology ; Jinga Shrimp ; Metapenaeus affinis ; Reproductive ; Persian Gulf and Oman Sea ; Hormozgan Province ; Bandar Abbass ; Sirik ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 151-160
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  • 6
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    Identified fishes of Kol River in Hormuzgan Province (2021)
    In:  http://aquaticcommons.org/id/eprint/23863 | 18721 | 2018-08-01 05:07:08 | 23863 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Kor River drains into the Persian Gulf and its watershed encompasses areas in Hormozgan, Kerman and Fars provinces. Identification of fish species of the river was conducted seasonally from summer to winter 2005. We selected 8 sampling stations based on the height of sea level from branches of Kol River near estuary. Totally, 160 specimens were caught with gillnet, cast net and hook. We identified 12 species, 12 genera, 7 families and 5 orders. The most diverse family was Cyprinidae represented by 5 species and 5 genera. In this family, Cyprinion watsoni was caught in 6 sampling stations and Cyprinus carpio species in only one station. Close to estuary, we found marine fish species such as mudskipper of Gobiidae, milk fish of Chanidae, ladyfish of Elopidae, and two species of Mugilidae families. The latter two species of Mugilidae were not seen in other stations. Of the identified species, Iranocichla hormuzensis, Garra persica and Schistura sargadensis were endemic and Cyprinus carpio was considered exotic.
    Keywords: Biology ; Fisheries ; Fish ; Diversity ; Kol River ; Hormuzgan province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 143-148
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  • 7
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    Density index and length scale of Pearl Oyster Pinctada radiata in two habitats around Hendorabi Island (Iran, the Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/22032 | 18721 | 2018-02-02 15:12:21 | 22032 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: As pearling has been banned in Iran since 2006, stocks of pearl oysters has not been investigated during these years; therefore, condition of natural habitats for Pinctada radiata in its old habitats was surveyed in present research. Shallow waters around Hendorabi Island were searched with diving and two habitats namely “Sooleh” and “Sahel-e-sheni”, were considered for study. The pearl oysters had most distribution in these habitats in depth ranges of 7 to 12 m and 8 to 11 m, respectively. Total stock in Sooleh and Sahel-e-sheni was surveyed near 35700 and 12563 Pinctada radiata, respectively, of which 22% and 67% were catchable, respectively. Catch Per Unit of Area (CPUA) in Sooleh and Sahel-e-sheni habitats was estimated equal to 0.3 N/m2 in both habitats, and Catch Per Unit of Effort (CPUE) in these habitats was calculated equal to 59.5 N/hr and 50.3 N/hr, respectively. Results of this study demonstrated that area, stocks and CPUA for studied habitats were less than previous years. Despite of interdict of pearling in this region since 7 years ago, stock revival has done slowly.
    Keywords: Biology ; Fisheries ; Mohar Pearl Oyster Pinctada radiata ; Density index ; Length scale ; Density ; Persian Gulf ; Iran ; Hendorabi Island
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 137-146
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  • 8
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    Age and growth of sind sardine (Sardinella sindensis) using otolith from Qeshm Island (Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/22769 | 18721 | 2018-05-21 19:01:23 | 22769 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: This is the first study of growth and age of Sardinella sindensis from coastal waters of Qeshm Island (Persian Gulf) based on the sectioned otolith reading method. In total, 128 fishes were collected randomly from purse seine commercial nets during March 2011 to February 2012. The annual formation of the growth rings were determined by counting the opaque and translucent zones occurrence at the outer margin of the otolith. The peak of opaque and translucent zones formation occurred in June and January, respectively. There was no significant differences between the sex ratio of males to females (p〉0.05). The total length and body weight for both sexes ranged between (7.9-18.6 cm) and (3.98-55.69 g). In total, four age classes were determined, and the maximum age was recorded as 3.5 years. The most abundant individuals were counted in 1+ age class, while the least number of fishes belonged to the 3+ age class. The non-linear regression relationship between the length and age for combined sexes were fitted in Von Bertalanffy growth equation, and described as: TL= 20.8 (1-e^-0.54(t+ 0.54)). There was a strong relationship between the body weight and total length of the fishes (p〉0.05), indicating that the growth type of S. sindensis is isometric. From the results of this study we concluded that S. sindensis is a fast-growing species with a short-life span. In order to obtain more reliable results about the age and growth of this species, we suggest that different methods of age determination should be used, combined with the evaluation of the factors affecting its growth for the management of optimum exploitation of the resources of this fish.
    Keywords: Biology ; Fisheries ; Age ; Growth ; Otolith ; Sardinella sindensis ; Qeshm Island ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: application/pdf
    Format: 217-231
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  • 9
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    Essential fish habitats (EFH) of small pelagic fishes in the north of the Persian Gulf and Oman Sea, Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/23175 | 18721 | 2018-06-19 15:37:26 | 23175 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-13
    Description: Small pelagic fishes particularly anchovy (Encrasicholina punctifer) and sardine (Sardinella sindensis) have an important role to support the Iranian fisheries and are distributed along the coastal waters of the Persian Gulf and Oman Sea. Using a logbook on small pelagic fisheries, a GIS-based environmental modeling approach was applied to investigate the presence and abundance of anchovy and sardine in relation to environmental variables. Redundancy analysis (RDA) was applied to provide a preliminary view of the relationships between fish presence/absence and environmental variables. Generalized Additive Models (GAMs) indicated the presence/absence of fish was related to distance from the nearest coast, depth, sea surface Chlorophyll-a, and SST. Results of the EFH showed that sardine is concentrated in specific areas of more favorable conditions, such as north of the Persian Gulf and all areas of the northwest of the Oman Sea. However, EFH of anchovy showed a more widespread distribution, occupying most of the north-west of the Oman Sea coastal waters, south of Qeshm Island in the Strait of Hormoz as well as the Parsian district in the north of the Persian Gulf. In this study, it seems that the anchovy showed the probability of presence in the areas with more distance from the coastal waters. However, the EFH probability presences of sardine were predicted for near coastal water and obviously, shallower waters. Due to the development of small pelagic fisheries, it is highly recommended to investigate anchovy and sardine fishing possibility in areas with high EFH prediction probability.
    Keywords: Biology ; Fisheries ; Small pelagic fishes ; Essential fish habitat ; Marine environment ; Persian Gulf ; Oman Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 74-94
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  • 10
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    Population structure of banana shrimp, Penaeus merguiensis De Man, 1888 in the Strait of Hormoz, Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/23173 | 18721 | 2018-06-19 15:33:44 | 23173 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-13
    Description: Monthly length frequency data of banana shrimp, Penaeus merguiensis were collected from the coastal waters of the north east of the Persian Gulf, from January 2012 to January 2013. Software package FiSAT was used to analyze the length frequency data. Growth parameters, mortalities, exploitation rate and recruitment pattern were estimated from the carapace length in the area. Based on length – weight relationships, the estimated parameter a was 0.0015 for males and females and b was 2.8015 for males and 2.7852 for females. The estimated growth parameters: L∞=39.5 mm, K=1.8 year^−1 and t0=-0.08 year^−1 for males and L∞=50 mm, K=1.5 year^−1 and t0=-0.09 year^−1 for females. Longevity was estimated 1.67 and 2.00 years for males and females, respectively. The estimated mortality coefficients, were Z=5.9 (4.89 – 6.92) year−1 (α=0.05), M=2.9 year^−1 and F=3.0 year^−1 for males and Z=5.7 (4.94–6.37) year^−1 (α=0.05), M=2.5 year^−1 and F=3.2 year^−1 for females. The length at first capture, Lc estimated from the probability of capture routine was 23.3 mm for males and 24.2 mm for females. Sex ratio (M:F=1.1:1) was significantly different to 1:1. The exploitation rates of shrimp were 0.49 and 0.56 for males and females, respectively which could get higher because the survival of spawning stock after the fishing season is related to environmental factors and has less effect on the next year’s biomass. Recruitment was continued throughout the year but with one major peak in July to November.
    Keywords: Biology ; Fisheries ; Penaeus merguiensis ; Population dynamics ; Persian Gulf ; aquaculture ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 47-66
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