黄海南部和东海北部刀鲚的数量分布及其群体结构特征

Spatial Distribution and Population Structure of Coilia nasus in the Southern Yellow Sea and Northern East China Sea

以2008年5月至2009年2月黄海南部和东海北部渔业资源监测调查数据为依据,分析了海洋中刀鲚的数量分布、群体结构特征以及分布海域的环境特征。结果表明,春季(5月)和夏季(8月)未采集到刀鲚,在秋季(11月)采集到1241尾,平均渔获率为0.211 kg/h,冬季(2月)采集到4 526尾,平均渔获率为0.490 kg/h,黄海南部和东海北部的刀鲚主要分布在大沙渔场附近,水温6～20℃,在30～60 m水深处、32度等盐线海域分布较密集。所采集的刀鲚平均体长240.77 mm,平均体重55.09 g,在海洋中主要摄食虾类和端足类等,其摄食率在2-4月较高。

Based on the data obtained from the fishery resources monitoring in the southern Yellow Sea and northern East China Sea（26°00＇-34.5°00＇ N, 121°00-126.5°00＇ E） from May in 2008 to February in 2009, the spatial distribution and population structure of Coilia nasus were analyzed. The results indicated that C. nasus was collected in autumn （November in 2008） and winter （February in 2009）, while not collected in spring （May in 2008） and summer （August in 2008）. The individual number of C. nasus was 1 241 and the average catch rate was 0.211 kg/h in autumn. However, they were 4 526 and 0.490 kg/h in winter. It was found that C.nasus distributed mainly in the Dasha fishing ground where the bottom temperature ranged from 6 to 20 ℃. And the bottom salinity was 32 and water depth ranged from 30 to 60 m. In addition, the average body length and weight of C. naztts collected in the sea were 240.77 mm and 55.09 g respectively. Decapoda and am- phipoda were the dominant prey of C. nasus, meanwhile, the degree of stomach fullness was the highest from February to April.