An analysis of the difference between day and night average catch wasmade from bottom trawl surveys in autumn 1985 and in 1986. The Bray-Curtis index wasused to measure the dissAnilarity between day and night average catch.

• 利用1985和1986年秋季底拖网资源调查数据,分析了昼夜平均渔获量的差异,采用Bray－Curtis系数测量其不相似性。