摘要
对1997-2005年长江口亲蟹汛期渔获规格和捕捞量进行了研究,并对资源量和最大持续产量进行了估算．亲蟹平均壳长、壳宽和体重分别为61 mm、66mm和142 g,雌雄个体比例为1:2．16;同期亲蟹年均捕捞量为2．03t,最大持续产量参考值为1．06 t．研究期内亲蟹个体规格差异过大,捕捞量变动剧烈且时间分布有前移趋势,捕捞量相关因子的年间变动没有显著规律．此外,插网作业方式应予以禁止或限制,九段沙附近水域的捕捞强度也应得到有效控制．
Studies on capture sizes and catch in fishing season of brooders of mitten crab in estuary of the Changjiang River were carried out during 1997 -2005, and at the same time current resource and MSY were estimated. Mean values of carapace length, width and body weight were 61mm,66mm and 142g respectively, and the proportion between female and male was 1 ： 2.16. In the corresponding period, average yield was 2.03 tons and MSY evaluated by model of schaefer was 1.06 tons. In research time, yield fluctuated exquisitely and catch percentage of November rose evidently. Besides, exorbitant differences of capture sizes in individuals and irregular fluctuation of correlative factors could also be found. To protect resource of mitten crab, immovable net fishing should be forbidden or restricted, and more attention should be paid to control the fishing intensity around the Jiuduan alluvion. In conclusion,certain proposals are put forward. Further studies should be taken on spawning habits and trend of catch fluctuation of brooders of mitten crab in Changjiang River estuary. Integrated protect system may establish as soon as possible. At last, to strengthen management and insist on secure artificial propagation is required.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2007年第2期212-217,共6页
Journal of Lake Sciences
基金
国家科技基础条件平台项目/长江中下游水产种质资源标准化整理
整合与共享(2004DKA30470)资助
