运用体长股法初步估算湖口江段短颌鲚资源量

Preliminary Estimate for Resource of Coilia brachygnathus in Hukou with Length Based Cohort Method

短颌鲚(Coilia brachygnathus)是一种重要的渔业资源,2012年湖口江段短颌鲚的渔获量为1.03 t,运用体长股法对湖口江段短颌鲚资源量进行了初步评估。结果表明,体长体重关系为BW=0.003BL3.041;自然死亡系数M=0.603;最大体长组的捕捞死亡系数F初始值分别取0.25、0.50和0.75时,短颌鲚资源数量依次为198.492万、186.456万和182.432万尾;短颌鲚资源重量依次为3.52、3.15和3.04 t。

Coilia brachygnathus is one of important fishery resources, with yield of 1.03 t in Hukou in 2012. Resource of C. brachygnathus in Hukou was preliminarily assessed with length based cohort method to provide reference for fisheries management. The results showed that body length（BL） and weight（BW） relationship was BW=0.003 BL3.041. Natural mortality coefficient was M=0.603. Fishing mortality coefficient of maximum body length group was 0.25,0.50 and 0.75, respectively. The number of resources was 1.984 92 million, 1.864 56 million and 1.824 32 million. The resource weight was 3.52 t,3.15 t and 3.04 t.