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首页> 外文期刊>Archiva Zootechnica >Demographic characteristics of African river prawn, (Macrobrachium vollenhovenii, Herklots 1857) in the Lower Taylor Creek, Niger Delta, Nigeria
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Demographic characteristics of African river prawn, (Macrobrachium vollenhovenii, Herklots 1857) in the Lower Taylor Creek, Niger Delta, Nigeria

机译:尼日利亚尼日尔三角洲下泰勒河中非洲河虾的种群特征(Macrobrachium v​​ollenhovenii,Herklots 1857)

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The growth, mortality, recruitment and current rate of exploitation of Macrobrachium vollenhovenii in the Lower Taylor Creek, Niger Delta, Nigeria were studied for 24 months (June 2008 – May 2010) using length frequency data and FAO – ICLARM Stock Assessment Tool (FISAT II). Growth parameters obtained from seasonalized von Bertanlanfy growth function were asymptotic length, L∞ = 12.08 cm total length, growth co-efficient (K/year = 2.70), oscillation constant C = 0.95 and winter point, WP = 0.15 (February) for M. vollenhovenii. Using length – converted catch curve, the total mortality (Z) was estimated at 5.31/year, the natural mortality (M) was 4.46/year, while fishing mortality (F) was estimated at 0.85/year for M. vollenhovenii. The exploitation rate (E) obtained was 0.16 suggesting M. vollenhovenii is being under – fished
机译:使用长度频率数据和粮农组织– ICLARM种群评估工具(FISAT II),研究了尼日利亚尼日尔三角洲下泰勒河中沼虾的生长,死亡率,募集和当前开采率,为期24个月(2008年6月至2010年5月)。 )。从季节性von Bertanlanfy生长函数获得的生长参数是渐近长度,L∞=总长度12.08 cm,生长系数(K /年= 2.70),振荡常数C = 0.95和冬季,M的WP = 0.15(2月) Vollenhovenii。使用长度-转换渔获曲线,vollenhovenii的总死亡率(Z)估计为5.31 /年,自然死亡率(M)为4.46 /年,而捕捞死亡率(F)估计为0.85 /年。所获得的开发利用率(E)为0.16,表明Vollenhovenii处于捕捞之下

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