清河水库鲢、鳙群体动态研究 Ⅱ.最大持续渔获量估计

The Stock Dynamics of Silver Carp and Bighead Carp Ⅱ. Assessment of the Maximum Sustainable Yields

根据可持续捕获量模型,在假定放养规模基本不变的情况下,用不同的捕捞死亡系数、自然死亡系数、开捕年龄求得清河水库的最大可持续渔获量,即在将开捕年龄从3龄推迟到4龄时,鲢、鳙的捕获量能达到到65kg/hm2/a和64kg/hm2/a。

As the stocking methods, including stocking number and size of silver carp and bighead carp in Qinghe Reservoir keeping equal, the maximum sustained yields (MSYs) can be worked out by the model of sustained model at different catching mortality, natural mortality and first caught age. When the first caught age postponed from 3 to 4 years old, silver carp and bighead carp in the reservoir could produce 65 and 64 kg/ha/a of yield.