胶州湾曼氏无针乌贼资源量与季节变化的调查研究

Studies on Sepiella maindroni biomass and seasonal variation in Jiaozhou Bay

关键词:  胶州湾  曼氏无针乌贼  底拖网  资源量  季节变化

Key words:  Jiaozhou Bay  Sepiella maindroni  Bottom trawl  BiomassSeasonal variation

摘要:

根据2005年和2006年逐月在胶州湾进行的底拖网调查，并对底拖网渔获物中的头足类进行定性定量分析与测定，利用扫海面积法评估胶州湾海域曼氏无针乌贼的资源量。调查分析了其分布特点与季节变化，并进行了渔获物中头足类组成的比较，分析了其种类组成、分布特点与季节变化特征。结果表明，胶州湾曼氏无针乌贼资源量有明显的季节变化，夏、秋两季的资源量明显高于其他季节，分别达到26.7t和21.5t（2006）；夏、秋两季的重量比明显高于其他季节，分别达到23.4%和27.8%。近几年，以曼氏无针乌贼为主捕对象的头足类资源量基本保持稳定，年平均资源量约14t，接近20世纪90年代中期的水平。

Abstract:

The study is based on the bottom trawl catch data in Jiaozhou Bay from 2005 to 2006. The Sepiella maindroni abundance in the waters of Jiaozhou Bay was assessed by using resource density area method. The ecological characteristics and seasonal distribution were surveyed； the catch composition of bottom trawl were compared；the species composition, seasonal variations and distribution were analyzed. The results showed obvious changes in Jiaozhou Bay Sepiella maindroni resources in different season；the resources in summer and autumn respectively reached 26.7 t, 21.5t (2006) and was significantly higher than that of the other seasons.The proportion of weight in summer and winter were 23.4% and 278%,respectively,and was obviously higher than that of the other seasons in 2006. In recent years，the cephalopod resources in which the Sepiella maindroni was a main catch species maintained almost stable and the average catch was about 14t, close to the level of mid 1990s. 