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南湾水库的鳙鱼的平均年龄为3龄,南湾水库鳙鱼体长与体重的关系呈幂指数关系,关系式为W=0.0413L2.8472(R2=0.9422)。应用VonBertalanffy生长方程拟合其生长规律,体长与体重的生长不等速,其主要生物学参数为:L∞=87.6cm,W∞=28.5kg,体长的k=0.2443、t0=0.26778;体重的k=0.141、t0=-0.137,拐点年龄ti=7.5龄,拐点体重为8.05kg。回捕率37.5%,自然死亡率27.0%,其它死亡率33.3%。南湾水库鳙鱼的适宜开捕年龄为3+龄,平均体重约3947g。适当减小起捕规格,提高捕捞强度,可增加鲢鳙鱼的产量和效益。
The average age of the anchovies in Nanwan Reservoir is 3 years old. The relationship between body length and body weight of the anchovy in the Nanwan Reservoir shows a power-exponent relationship of W = 0.0413L2.8472 (R2 = 0.9422). The main biological parameters were L∞ = 87.6cm, W∞ = 28.5kg, body length k = 0.2443, t0 = 0.26778; Weight of k = 0.141, t0 = -0.137, inflection age ti = 7.5 years, inflection point weight of 8.05kg. The recovery rate was 37.5%, the natural mortality rate was 27.0% and the other mortality rate was 33.3%. Nanwan Reservoir catfish suitable for catching the age of 3 + age, average body weight of about 3947g. Appropriate to reduce the catching specifications, improve fishing intensity, can increase the yield and benefits of silver carp and bighead carp.