东海口足类(Stomatopod)种类组成和数量分布

根据2008年春（5月）、夏（8月）、秋（11月）、冬（2009年2月）4个季节东海（26°00’～33°00’N，127°00’E以西）桁杆拖虾网所获得的口足类调查资料，以渔获率作为口足类分布的数量指标，分析了调查海域的口足类种类组成、数量分布及时空变化趋势。结果表明：调查海域四季共捕获口足类20 种，隶属于4 科，11 属，其中优势种为口虾蛄（Oratosquillaoratoria）和黑斑口虾蛄（Oratosquilla kempi）；在各季节出现的口足类种类数中，春季出现最多，其余三季变化不大；各季节口足类渔获量及渔获率变化明显，冬季渔获量及渔获率最高，以下依次为夏季、春季和秋季；从区域分布看，东海南部海域在口足类种类数和生物量两项指标均高于北部和中部两个海域；口足类以及优势种口虾蛄在4 个季节的调查中具有相对较为集中的生物量高发区，但聚集特征不明显；黑斑口虾蛄的分布则表现出了十分明显的地域特征。

Species Composition and Quantitative Distribution of Stomatopod in the East China Sea

Based on data from beam shrimp trawl net surveys in four seasons of 2008 and 2009 in the East China Sea (26°00'－33°00'N, West of 127°00'E), we used CPUE (catch per unit effort) as the index for quantitative distribution of Stomatopod, and analyzed the changes of species composition, and quantitative distribution of Stomatopod in the East China Sea. The result shows that: 20 species of stomatopod were found in the survey area, belonging to 4 families and 11 genuses, Oratosquilla oratoria and Oratosquilla kempi were dominant species. The number of species in spring is the highest among four seasons, and the rest varied unconspicuous. The yield of catch and CPUE in each season varied obviously, those were the highest in winter, and then summer, spring, autumn successively. According to the distribution of each area, the number of species and biomass was higher in the southern East China Sea than the other two areas. Though both the Stomatopod and Oratosquilla oratoria had relatively high occurrence areas of biomass in four seasons, they were all unconspicuous. The distribution of Oratosquilla kempi showed regional characteristics.