摘要
对采集39尾新疆某水库鲤(Cyprinus carpio)标本测定年龄、生长并对其资源特征进行研究。研究结果显示:鲤渔获物年龄组成为1—7龄,优势龄组为3龄和4龄,其中3龄组渔获数量所占比例最大,为50%,4龄组占17%,2龄和5龄组分别占11%和8%。;体质量与体长表现为异速生长,关系式为W=4×10~(-5)SL~(2.8387)。用退算体长拟合的von Bertalanffy生长参数为:SL_∞=107.611 cm,k=0.0929,t_0=-0.3887。体质量生长参数为:W_∞=23.4453 kg,k=0.0929,t_0=-0.3885。生长特征指数为:准=6.98;生长拐点年龄为10.8龄,拐点时体长和体质量分别为69.6 cm和6.8 kg。种群生物量最大年龄为8.2龄。种群总死亡系数为:Z=0.62;自然死亡系数为M=0.22;捕捞死亡系数为F=0.41;当前开发率为:Et=0.65。截至2016年10月,鲤资源量约7 942尾,2.4 t。
The age, growth and resource characteristics of Cyprinus carpio were described based on the 39 specimens collected in Xinjiang's reservoir in July 2016. The results showed that the growth between body weight and length had an allometry. The length-weight relationship could be described by the following equations: W=4×10~(-5)SL~(2.8387). Growth could be described by von Bertalanffy equation with the growth parameters: SL_∞=107.611 cm, k=0.0929,t_0=-0.3887, and weight growth parameters: W_∞=23.4453 kg, k=0.0929, t_0=-0.3885. The inflexion point of age for body weight growth and the corresponding body length and body weight was at 10.8years, 69.6 cm and 6.8kg. The age of maximum biomass of the population was at t=8.2years. The total mortality coefficient, natural mortality coefficient, fishing mortality coefficient, and current exploitation rate could be estimated: Z=0.62, M=0.22, F=0.41, Et=0.65. The standing crop of the population, surpassing the carrying capacity of reservoir, was about 7942 fish(2.4t).
引文
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