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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 (2018)
    Details
    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
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    Population assessment and yield per recruit of longtail tuna (Thunnus tonggol) in Northern of the Persian Gulf and Oman Sea (Iran, Hormozgan Province) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The purpose of this study was to find some important biological aspects of Thunnus tonggol in coastal waters of Hormozgan Province (Persian Gulf and Oman Sea). A total monthly data of 4383 individuals ranging from 25 to 124 cm fork length were collected from April 2015 to March 2016. The data were analyzed with FiSAT II software using the ELEFAN1 package to estimate the population parameters. The length-weight relationship was TW=0.00002 FL^2.87 (R^2 =0.97) showing an isometric growth for T. tonggol. Growth parameters were computed as L∞=129.6 cm, K=0.39 year^-1 and t0=−0.28 with the growth performance index, φ’ of 8.7. The total mortality (Z) was estimated 1.58 year^-1 using catch curve method. The natural (M) and fishing mortality (Fcurr) were obtained 0.49 and 1.09 year^-1 , respectively. The exploitation ratio was 0.69. Length at first capture (Lc) was estimated as 60.2 cm fork length. The yield per recruit (Y/R) maximized in maximum fishing mortality rate 0.85 year^-1 . The biomass per recruit decreased to 17.2% of unexploited biomass (virgin biomass) at Fcurr. The current fishing mortality exceeds optimum fishing mortality (Fopt) and limit fishing mortality (Flimit) as biological reference points. The results indicated that population of T. tonggol is overexploited in the Persian Gulf and Oman Sea and there no further scope for improving the exploitation of this species.
    Description: Published
    Keywords: Thunnus tonggol ; Longtail tuna ; Population dynamics ; Biomass ; Population
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.776-789
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  • 3
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    Determination of Catch per Unit of Area (CPUA), biomass catch composition of Bottom Trawl demersal resources from Sistan and Balochestan province coastal waters (2018)
    Details
    Publication Date: 2021-05-19
    Description: Biomass, Catch per Unit of Area (CPUA), distribution and catch composition of Bottom Trawl demersal resources from Oman Sea (Sistan and Balochestan province coastal waters) were investigated in this study. Data were collected in one research cruise by using R/V Ferdows-1 during 2016. The study area was stratified into 5 strata (M to Q) and 4 Substratum covering the depths of 10- 20, 20-30, 30-50 and 50-100 m in the Oman Sea. A total of 92 stations were selected in a random stratified design distributed in different depths and area. The swept are method was used to access and estimate the amount of biomass and CPUA. Result indicated that the percentage of density of demersal resources in the M Stratum (Biahi to Galak estuary) and Stratum Q (Bersi to Gwatr) had the highest value of biomass and CPUA. Also depths of 10-20 m had lowest value CPUA and biomass of commercial, non-commercial and total species. The amount of biomass in depth of 50-100 m was 4.1 times higher than that of depth 10-20m. Maximum CPUA of commercial, non-commercial and total species was estimated in strata M, M and Q and M respectively. Aroun100 species were identified in this study; the results of the study suggest that high density of commercial species distribution concentrated in West-coast, while non-commercial resources observed in East coast of Sistan and Balochestan province. The Result of this study is beneficial for objective management of Demersal Resources exploitation in Oman Sea.
    Description: Published
    Keywords: CPUA ; Distribution ; Catch composition ; Biomass ; Determination ; Area
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.83-93
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  • 4
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    Identification of by-catch species of tuna purse seiners in Iranian waters of Oman Sea (2018)
    Details
    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: By-catch ; Tuna ; Purse seine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.239-244
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  • 5
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    Evaluation of electronarcosis and clove oil for short-term anesthesia in common carp, Cyprinus carpio L. 1758 (2017)
    Details
    Publication Date: 2021-05-19
    Description: Anesthesia is considered to be the best way to ensure animal welfare during handling etc. Clove oil and electronarcosis are among the most popular chemical and physical anesthetics used in fisheries and biology; however there is a little information available on the effect of anesthesia using direct electric current in fish. In the present study, the impacts of clove oil (30 mg.l-1) and electro-anesthesia (constant direct current, 0.5 v.cm-1) (DC) were assessed in common carp, Cyprinus carpio during narcotic stage in two experimental sets. Experiment 1 was conducted to quantitatively compare induction of anesthesia and recovery time. The biochemical and hematological effects of anesthetics were analyzed as experiment 2. The results revealed that induction and recovery times in fish anesthetized with electric current were significantly lower than clove oil treatment. Significant differences were observed in cortisol concentrations, red blood cells and mean corpuscular hemoglobin concentration between anesthetic methods. Our results suggest that constant direct current electronarcosis was more quickly than clove oil and associated with lower side effects in common carp.
    Description: Published
    Keywords: Electronarcosis ; Cyprinus carpio ; Electro-anesthesia ; Evaluation ; Clove oil ; Anesthesia ; Hematology ; Plasma Biochemistry
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.299-310
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  • 6
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    Length-weight and length-length relationships, Relative condition factor and Fulton’s condition factor of Five Cyprinid species in Anzali wetland, southwest of the Caspian Sea (2017)
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to determine length-weight and length-length relationships, relative condition factor (Krel) and Fulton’s condition factor (K) for five species including Scardinius erythrophtalmus, Carassius auratus gibelio, Cyprinus carpio, Tinca tinca and Hemiculter leucisculus belonging to Cyprinidae family. Fish sampling was carried out by gill net and fyke net in the western region of Anzali wetland (SW of the Caspian Sea) between Nov. 2010 and May 2011. 368 specimens were measured and weighed. The values of the exponent b in the length-weight relationships (LWRs) ranged from 2.5358 to 3.3613 and those of the length-length relationship (LLRs) ranged from 0.8717 to 0.9412. Also, relative condition factor (Krel) ranged from 1.00±0.11 to 1.30±0.21 and Fulton’s condition factor (K) ranged from 0.80±0.05 to 1.60±0.18 for all species.
    Description: Published
    Keywords: Relative ; Scardinius erythrophtalmus ; Carassius auratus gibelio ; Cyprinus carpio ; Tinca tinca ; Hemiculter leucisculus ; Fish Cyprinidae ; Length-weight relationship ; Length-length relationship ; Length ; Weight ; Species
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: p.25-31
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