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首页> 外文期刊>Zoology and Ecology >Population dynamics of Niger River prawn (Macrobrachium felicinum) in Lower Taylor Creek, Niger Delta, Nigeria
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Population dynamics of Niger River prawn (Macrobrachium felicinum) in Lower Taylor Creek, Niger Delta, Nigeria

机译：尼日利亚尼日尔三角洲下泰勒河的尼日尔河虾（Macrobrachium felicinum）种群动态

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摘要

The population dynamics of Macrobrachium felicinum (Holthuis, 1949) in Lower Taylor Creek, Niger Delta, Nigeria, was analysed using monthly length-frequency data (June 2008 - May 2010). This study was aimed at determining the status of fishery and establishing the levels of exploitation that will give sustainable yields. The FAO-ICLARM stock assessment tool (FISAT II) software was used to estimate population parameters. The growth parameters obtained from the seasonalised Von Bertalanffy growth function were Loo = 10.24 cm total length, A7year = 1.40, C = 0.85; and WP = 0.79 (September). Using a length-converted catch curve, total mortality (Z) was estimated at 9.50/year, natural mortality (M) at 3.04/year, while fishing mortality (F) was estimatedat 6.46/year. From the probability of capture estimation, the length-at-first capture (Lc) for M. felicinum was 4.55 cm. One major recruitment peak per year was established for M. felicinum, while the relative yield-per-recruit analysis predicted the maximum exploitation rate (Enm) of 0.42 against the current exploitation rate (E) of 0.68, suggesting M. felicinum is being over-fished. The management efforts should therefore be concentrated on regulating the mesh sizes of the traps as a means of reducingthe fishing pressure on M. felicinum in Lower Taylor Creek.
机译：使用月长度频率数据（2008年6月至2010年5月）分析了尼日利亚尼日尔三角洲下泰勒河的沼虾的种群动态（Holthuis，1949）。这项研究旨在确定渔业状况并确定可提供可持续产量的开发水平。 FAO-ICLARM库存评估工具（FISAT II）软件用于估算种群参数。从季节性Von Bertalanffy生长函数获得的生长参数为Loo =总长度10.24 cm，A7year = 1.40，C = 0.85; WP = 0.79（9月）。使用长度转换的渔获曲线，总死亡率（Z）估计为9.50 /年，自然死亡率（M）为3.04 /年，而捕捞死亡率（F）估计为6.46 /年。从捕获量估计的可能性来看，犬莫里氏菌的首次捕获长度（Lc）为4.55 cm。 felicinum每年建立一个主要的招聘高峰，而相对每产量的分析预测最大利用率（Enm）为0.42，而当前的利用率（E）为0.68，这表明felicinum已经超过-钓鱼。因此，管理工作应集中在调节诱集装置的网眼尺寸上，以减轻在下泰勒河上的M. felicinum的捕捞压力。

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