摘要
湖区河蟹群体通常由三个年龄组组成。造成河蟹资源量年变化有三方面原因。影响其资源盛衰主要有十大因素。秋冬季河蟹捕获量中Ⅱ秋龄占多数达61.68％。蟹苗放流后的回捕指数400～800,回捕率2～4％。放流效果由湖区饵料基础、放流密度、栖息环境、水位变动、潮泊性状和人为伤害等条件决定。
River crab population consist of three year-groups in lakes. Three causes affect yearly stock changes
of rive crab. Ten factors affect stock variety of rive crab. During autumn-winter fishing, the ratio of two-autumn rive
crab is 61. 83%. After liberation, return capture-index of rive crab is 400-800, return-capture ratios 2-4%. the
effect of liberation maybe influnced by food base, libeution density, living environment, change of water level, lake
charactistics, destruction from man and so on.
出处
《淡水渔业》
CSCD
北大核心
1991年第1期10-13,共4页
Freshwater Fisheries
