利用聚类和相关分析方法，研究了单位捕捞努力量渔获量与表层盐度及不同水层水温的关系。

By using methods of cluster and correlation analysis, the correlation of the catch per unit effort (CPUE) to the sea surface salinity and the seawater temperatures of different depths were studied.

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基于扩展残存资源量法，提出一种根据分年龄组渔获量以及资源量指数(单位捕捞努力量渔获量，CPUE)求算鱼类的自然死亡系数(M)的新方法。

A new method for estimating fish natural mortality coefficient (m), based on the extended survivors method, using a catch-at-age data and an abundant index (catch per unit effort, CPUE) was proposed.

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