长江中下游中华绒螯蟹亲体资源动态研究
STUDIES ON DYNAMIC CHANGE OF MATURED MITTEN CRAB RESOURCE IN THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER
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摘要: 依据1989～1999年间的连续监测数据表明,长江河蟹平均壳长58mm;平均壳宽63mm;平均体重131g.雌雄性比为1:0.92,汛期高峰10月4日-10月19日;河口段为11月下旬.资源急剧衰退,南京以上江段亲蟹蟹汛已消失.本文对长江亲蟹的捕捞现状、生殖洄游进行了分析,提出了长江河蟹资源保护措施.Abstract: According to the data from continuous monitoring during 1989～1999,the average body length, body width and body weight of matured mitten crab caught from the Yangtze River were 58mm, 63mm and 131g respectively. The ratio of female to male was 1:0.92 in the catching. The peak season of the crab catching was from Oct. 4 to Oct. 19 in the middle and lower reaches of the river and late November in the estuaries. As the result of drastic declining of the matured mitten crab resource, the catching season of matured mitten crab disappeared in the river course upper than NanJing. The authors analyzed the reproductive migration and the present catching of the crab in the Yangtze River. Protective measures on the crab resource in the Yangtze River were also suggested in the paper.
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Keywords:
- Crab broodstock /
- Crab season /
- Migration /
- Crab resources /
- Protection
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