延长东海区伏季休渔期的渔业效果分析

Effects of the prolonged summer closed fishing period on fisheries in East China Sea

根据2000—2006年东海区底拖网定点调查和常规监测资料,利用Ricker动态综合模型对延长东海区休渔期的渔业效果进行了分析。结果表明,提前或提前并延后伏季休渔期,对于主要经济鱼类(带鱼Tri-chiurus japonicus和小黄鱼Larimichthys polyactis)渔获量的增加和渔获质量的提升效果均较为明显。如果将休渔期提前半个月,则带鱼的年产量将增加9.35%,渔获个体平均体重将增加21.61%;小黄鱼的年产量将增加5.89%,渔获个体平均体重将增加14.45%。如果将休渔期提前并延后各半个月,则带鱼的年产量将增加13.87%,渔获个体平均体重将增加41.21%;小黄鱼的年产量将增加8.71%,渔获个体平均体重将增加26.44%。鉴于此,建议渔业行政主管部门尽早延长伏季休渔期,并加强渔业管理。

The influence of extension of the summer closed fishing period on yield of hairtail （ Trichiurus japonicas） and small yellow croaker（Larimichthys polyactis） was studied by Ricker population dynamic pool model on the data collected from demersal trawling surveys in the East China Sea region from 2000 to 2006. The results showed that the average body weight and total catch of hairtail and small yellow croaker were found to increase significantly following the implementation of the prolonged summer closed fishing period. When the summer closed fishing began early half a month annually, extending from 1 June to 16 September, the total catch and average body weight of the hairtail increased by 9.35% and 21.61%, and 5.89% and 14.45% for the small yellow croaker, respectively. The catch and average body weight of hairtail and small yellow croake were found to be 13.87%, 8.71% ,and 41.21%, 26.44%, respectively, when the summer closed fishing period extended from 1 June to 1 October. So we suggest that the current duration of summer closed fishing be prolonged as long as possible to strengthen the fishery resources in the East China Sea region.