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  • 1
    Publication Date: 2021-05-19
    Description: One of the most visible direct impacts of fishing is the capture of non-target species, known collectively as bycatch. 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).
    Description: Published
    Keywords: Thunnus tonggol ; Thunnus albacares ; Katsuwonus pelamis ; By-catch ; Tuna ; Purse seine ; Identification ; Species
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.239-244
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  • 2
    Publication Date: 2021-05-19
    Description: Reproduction of silver pomfret Pampus argenteus studied in fishing area of Persian Gulf and Oman Sea (Hormozgan province) from Bandar-lengeh and .Bandar- abbas to Sirik for 14 months from October 2001 to November 2002. Total fecundity in female for 159 mm (FL) was 37232 and for 288 mm (F.L) was 476626. Spawning season was from April to September with 2 peak in May and August. Lm50 for female was 196 mm (FL).Sex ratio for all months was not .Annual sex ratio was not 1:1 for Bandar-lengeh (p〈0.05, df=l) , But was for Bandar- Abbas (p〈0.05 , df =l). Matured fish mangro creeks at northern part of Qeshm Island.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Pampus argenteus ; Silver pomfret ; Reproduction ; Fecundity
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 52pp.
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  • 3
    Publication Date: 2021-05-19
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 37pp.
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  • 4
    Publication Date: 2021-05-19
    Description: The long nose trevally, Carangoides chrysophrys is one of important commercial species of family carangidae in the Persian Gulf and Oman Sea .population dynamic parameters, reproductive biology and feeding habits of this species were studied from April 2016 to march 2017 in the Coastal Waters of Hormuzgan province. Length frequency analysis of 440 specimens of C.chrysophrys with total length (TL) ranged from 250 to 800 mm were shown isometric growth. Growth parameters including K, L and t0 were calculated 0.390 (1/year), 66.86 Cm and 0.029 Year respectively. The instantaneous rate of total mortality (Z), natural mortality (M) and fishing mortality (F) were estimated 1.21, 0.761 and 0.449 (1/year) respectively. Exploitation rate was 0.4 per year indicated that fishing effort on this species is in a moderate condition. Reproductive studies showed that C.chrysophrys has long spawning period with two peaks in spring and autumn respectively. Females reached 50% sexual maturity at 38.4 cm. Stomach content analysis of this species revealed that bony fishes (% 77) formed main food and followed by crustacean (% 18) and molluscs (% 5) as random food.
    Description: PhD
    Keywords: Fish ; Feeding habits ; Population Parameters ; Spawning season
    Repository Name: AquaDocs
    Type: Thesis/Dissertation
    Format: 141pp.
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  • 5
    Publication Date: 2021-05-19
    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.
    Description: Published
    Keywords: Small pelagic fishes ; Essential fish habitat ; Marine environment
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.74-94
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  • 6
    Publication Date: 2021-05-19
    Description: The relative growth of the fiddler crab Uca sindensis in Pohl Port was studied. Ten 0.5 m2 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 to13.5 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: Published
    Keywords: Aquaculture ; Ocypodidae ; Crustacea ; Fiddler crabs ; Uca sindensis ; Relative growth ; Carapace width ; Allometry ; Abdomen width ; Sexual
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.639-653
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  • 7
    Publication Date: 2021-05-19
    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.
    Description: Published
    Keywords: Aquaculture ; Banana shrimp ; Penaeus merguiensis ; Population dynamics ; Population ; Structure
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.47-66
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  • 8
    Publication Date: 2021-05-19
    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.
    Description: Published
    Keywords: Biology ; Physiology ; Age ; Growth ; Otolith ; Sardinella sindensis
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.217-231
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  • 9
    Publication Date: 2021-05-19
    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 sub(0)) were estimated at 150.24 (cm), 0.66 year super(-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 super(-1) and 0.64, respectively. Five cohorts were distinguished based on Bhattacharya's method.
    Description: Published
    Keywords: Commercial fishing ; Potential yield ; Mortality causes ; Scomberomorus commerson ; Scombermorus commerson ; Growth rate ; Mortality ; Fishery management ; Fishing mortality ; Age determination ; Population dynamics ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.53-66
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  • 10
    Publication Date: 2021-05-19
    Description: The population parameters of Encrasicholina punctifer (buccaneer anchovy) from commercial fisheries in the Persian Gulf and Oman Sea coastal waters were studied from October 2014 to September 2015. A total of 13951 length-frequency data were collected monthly by pair-boat purse seine and beach seine methods. The asymptotic length (L∞) and Von Bertalanffy growth function (K) were 11.5 cm and K=1.4 per year, respectively. The value of to was calculated as -0.14 year. Longevity was estimated as 2 years. The total length ranged from 2.9 to 10.1 cm, with an average of 6.5 cm. The probability of capture was calculated in total length as L25=6.05 cm, L50=6.48 cm and L75=6.93 cm. Four cohorts were distinguished annually with mean lengths of 4.56, 5.77, 7.21 and 8.50 cm. The length-weight relationship was determined as W= 0.0051 L 3.1114. Total, natural and fishing mortality parameters were estimated as 6.15, 2.84 and 3.32 yr-1 respectively. The current rate of exploitation (E) was 0.54, and the values of exploitation ratio was found reasonable for current fishing effort. From the yield-per-recruit analysis, Emax, was estimated as 0.91. The results indicated that the buccaneer anchovy stock was not overexploited. Since E〈Emax, it confirmed the good potential of anchovy stock in the area.
    Description: Published
    Keywords: Encrasicholina punctifer ; Mortality ; Growth
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.313-326
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