| 巴基斯坦国日本金线鱼（Nemipterus japonicus）种群动力学的研究 |
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| 引用本文： | Kalhoro Muhsan Ali,刘群,Memon Khadim Hussain,Chang Mohammad Saleem,张魁.巴基斯坦国日本金线鱼（Nemipterus japonicus）种群动力学的研究[J].海洋学报(英文版),2014,33(10):49-57. |
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| 作者姓名： | Kalhoro Muhsan Ali 刘群 Memon Khadim Hussain Chang Mohammad Saleem 张魁 |
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| 作者单位： | 中国海洋大学水产学院, 青岛266003, 中国;巴基斯坦国海洋渔业处, 卡拉奇74000, 巴基斯坦;中国海洋大学水产学院, 青岛266003, 中国;中国海洋大学水产学院, 青岛266003, 中国;巴基斯坦国海洋渔业处, 卡拉奇74000, 巴基斯坦;中国海洋大学水产学院, 青岛266003, 中国;巴基斯坦国信德大学动物系, Jamshoro 76080, 巴基斯坦;中国海洋大学水产学院, 青岛266003, 中国 |
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| 基金项目： | The special research fund of Ocean University of China under contract No. 201022001. |
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| 摘 要： | Japanese threadfin bream Nemipterus japonicus(Bloch, 1791) is among the most abundant and commercially important species in Pakistan. From the coast of Pakistan, four demersal trawl surveys in October–November 2009 and May–June, August, October and November in 2010 were carried out. The purpose of this study is to estimate the population dynamics and status of the stock of the N. japonicus from Pakistani waters based on the research trawl surveys from the research area. The data consist of n=784 length-weight pairs and n=7 530 length frequency with the maximum length and weight of 29 cm and 358 g respectively. The length frequency data were analyzed using ELEFAN method in FiSAT computer package. The parameters of length and weight relationship were b=2.778, a=0.032 and R2=0.973. The estimated von Bertalanffy growth function parameters were L∞=30.45 cm, K=0.270 year-1. Based on length-converted catch curve analysis the total mortality(Z) during this study was estimated at 0.960 year-1. The natural mortality coefficient(M) was 0.74 year-1 using Pauly's equation(the annual average sea surface temperature was 27°C), therefore, the fishing mortality coefficients(F) were 0.22 year-1. The yield per recruit analysis indicated that when tc was 2, Fmax was estimated at 1.2 and F0.1 at 1.1. When tc was 1, Fmax was estimated at 0.95 and F0.1 at 0.8. Because current age at first capture is about 1 year and Fcurrent was 0.22, Fcurrent is smaller than F0.1 and Fmax, which indicated that the fishery is about in a safe condition. When using Gulland(1971) biological reference point, Fopt was equals to M(0.74). The current fishing mortality rate of 0.22 was smaller than the target biological reference point.
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| 关 键 词： | 巴基斯坦 种群动态 金线鱼 刺参 水域 鱼科 本金 最大长度 |
| 收稿时间： | 6/4/2013 12:00:00 AM |
| 修稿时间： | 2013/12/29 0:00:00 |
Population dynamics of Japanese threadfin bream Nemipterus japonicus from Pakistani waters |
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| Kalhoro Muhsan Ali,Liu Qun,Memon Khadim Hussain,Chang Mohammad Saleem and Zhang Kui.Population dynamics of Japanese threadfin bream Nemipterus japonicus from Pakistani waters[J].Acta Oceanologica Sinica,2014,33(10):49-57. |
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| Authors: | Kalhoro Muhsan Ali Liu Qun Memon Khadim Hussain Chang Mohammad Saleem and Zhang Kui |
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| Institution: | 1.College of Fisheries, Ocean University of China, Qingdao 266003, China;Marine Fisheries Department, Fish Harbor west wharf Karachi, Karachi 74000, Pakistan2.College of Fisheries, Ocean University of China, Qingdao 266003, China3.College of Fisheries, Ocean University of China, Qingdao 266003, China;Department of Zoology, University of Sindh, Jamshoro 76080, Pakistan |
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| Abstract: | Japanese threadfin bream Nemipterus japonicus (Bloch, 1791) is among the most abundant and commercially important species in Pakistan. From the coast of Pakistan, four demersal trawl surveys in October-November 2009 and May-June, August, October and November in 2010 were carried out. The purpose of this study is to estimate the population dynamics and status of the stock of the N. japonicus from Pakistani waters based on the research trawl surveys from the research area. The data consist of n=784 length-weight pairs and n=7 530 length frequency with the maximum length and weight of 29 cm and 358 g respectively. The length frequency data were analyzed using ELEFAN method in FiSAT computer package. The parameters of length and weight relationship were b=2.778, a=0.032 and R2=0.973. The estimated von Bertalanffy growth function parameters were L∞=30.45 cm, K=0.270 year-1. Based on length-converted catch curve analysis the total mortality (Z) during this study was estimated at 0.960 year-1. The natural mortality coefficient (M) was 0.74 year-1 using Pauly's equation (the annual average sea surface temperature was 27℃), therefore, the fishing mortality coefficients (F) were 0.22 year-1. The yield per recruit analysis indicated that when tc was 2, Fmax was estimated at 1.2 and F0.1 at 1.1. When tc was 1, Fmax was estimated at 0.95 and F0.1 at 0.8. Because current age at first capture is about 1 year and Fcurrent was 0.22, Fcurrent is smaller than F0.1 and Fmax, which indicated that the fishery is about in a safe condition. When using Gulland (1971) biological reference point, Fopt was equals to M (0.74). The current fishing mortality rate of 0.22 was smaller than the target biological reference point. |
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| Keywords: | Pakistan Nemipterus japonicus length-weight relationship growth mortality |
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