大伙房水库鲢鳙合适放养量的研究

On the recruitment and appropriate stocking number forthe silver carp and bighead carp stocks in Dahuofang Reservior

据Ｐｏｐｅ世代分析法估算鲢鳙群体的补充量。当补充年龄均为３．０龄，鲢鳙年放养量分别为３７７．４万尾和２５０．６万尾时，年补充量分别为２１．０６４８万尾和１７．７５９８万尾。按目前实际捕捞策略（ｔ＿ｃ＝３．０，Ｆｈ＝０．４３０２，Ｆａ＝０．２６７８），合适放养量分别为１２５８．６万尾和８０８．８万尾，若按计划捕捞策略（ｔ＿ｃ＝４．０，Ｆｈ＝０．８０，Ｆａ＝０．６０），合适放养量分别为９９１．８万尾和６２３．３万尾。１９９０年大伙房水库鲢鳙秋片鱼种的运输死亡率分别为２０．４８％和７．０３％。

The recruitment for silver carp and bighead carp stocks is assessed by Pope cohort analysis method. Both recruit ages are all 3.0 yerars.If the stocking number 377.4 × 10￣4 in silver carp and 250.6 × 10￣4 in big head carp, the recruit-ment will be 218648 and 177598 respectively. By the fishing policy at present(t_c =0, Fh=0.4302, Fa=0.2678),the appropriate stocking number is 1258.6× 10￣4 insilver carp and 808.8× 10￣4 in bighead carp. But they will be 991. 8× 10￣4 and623. 3×10￣4 if the fishing policy is under planning(t_c=4.0, Fh=0.8, Fa=6). The mortality rate after the transportation for the autumn fingerling was 20.49%in silver carp and 7.03% in bighead carp in 1990.