武汉后湖长角涵螺的周年生产量

Annual Production of Alocinma longicornis in Lake Houhu (Wuhan, China)

采用两种方法对后湖长角涵螺(Alocinma longicornis)的周年生产量进行了测算,结果表明,两种方法得到的生产量较为吻合.生产量的带壳湿重和去壳干重分别是:体长频率法,2.22 g/(m2·a),0.111 g/(m2·a);瞬时生长率法,2.177 g/(m2·a),0.109 g/(m2·a).对应的P/B系数为4.0,5.4.

The production of Alocinma Longicornis in Lake Houhu was estimated by two method. The results are: 2. 22 g/(m2 a) of wet weight with shell or 0.1ll g/(m2 a) of dry weight shell-free by size-frequency method; 2. 177 g/m2 a of wet weight with shell or 0. 109 g/mz a of dry weight shell-free by instantaneous growth method. The corresponding P/B ratio are 4. 0,5. 4,respectively.