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  • Fisheries  (5)
  • Cyprinus carpio  (3)
  • Tuna  (3)
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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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    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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  • 3
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    Evaluation of electronarcosis and clove oil for short-term anesthesia in common carp, Cyprinus carpio L. 1758 (2021)
    In:  http://aquaticcommons.org/id/eprint/21780 | 18721 | 2017-12-03 14:58:50 | 21780 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    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.
    Keywords: Biology ; Fisheries ; Clove oil ; Electro-anesthesia ; Cyprinus carpio ; Hematology ; Plasma biochemistryEvaluation ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 299-310
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  • 4
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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 (2021)
    In:  http://aquaticcommons.org/id/eprint/21706 | 18721 | 2017-11-27 13:51:54 | 21706 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-28
    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.
    Keywords: Biology ; Fisheries ; length ; weight ; relationships ; relative ; condition ; condition ; Caspian Sea ; Iran ; species
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 25-31
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  • 5
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    CPUE, CPUA and biomass of Pomadasys kaakan in the waters of Bushehr Province (Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/25030 | 18721 | 2018-11-16 08:43:37 | 25030 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-16
    Description: The CPUE, CPUA and biomass of Pomadasys kaakan was assessed in the waters of the province of Bushehr in 2011. The study area was divided into three areas (Northern, Central and Southern) and depth zones (10-20, 20-30 and 30-50 m).Stratified random sampling was used to collect the data. Samples were taken from 45 stations. The total length and total mean length were calculated to be 27-56 cm and 42.7±4.95 cm, respectively. The total biomass was estimated to be approximately 5943.55 tons. The total CPUE and CPUA were calculated as being 803.25 kg/h and 9269.05 kg/nm^2, respectively. The lowest mean CPUE was observed in the 20-30 m depth zone and was 8.82 kg/h and the highest mean CPUE was observed in the 10-20 m depth zone as 21.45 kg/h. The lowest and highest mean CPUA were calculated in the 20-30 m and 10-20 m depth zones as being 95.91 kg/nm^2 and 259.35 kg/nm^2 , respectively. Also, the central area of Bushehr showed the highest CPUA with an estimate of 8913.9 kg/nm^2. The results of this study demonstrated that the highest distribution and biomass of P. kaakan were concentrated in central areas and 30-50 m depth zones.
    Keywords: Fisheries ; Iran ; Persian Gulf ; Bushehr province ; Pomadasys kaakan ; CPUA ; Biomass
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 56-65
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  • 6
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    Population assessment and yield per recruit of long tail tuna (Thunnus tonggol) in northern of the Persian Gulf and Oman Sea Sea (Iran, Hormozgan Province) (2021)
    In:  http://aquaticcommons.org/id/eprint/26004 | 18721 | 2018-10-19 18:03:57 | 26004 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    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 (F limit) 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.
    Keywords: Fisheries ; Iran ; Persian Gulf ; Oman Sea ; Hormozgan Province ; Thunnus tonggol ; Longtail tuna ; Population dynamics ; Biomass ; Population
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 776-789
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  • 7
    facet.materialart.
    Unknown
    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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  • 8
    facet.materialart.
    Unknown
    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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  • 9
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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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