刺网网目尺寸对南海区金线鱼选择性研究

Study on selectivity of different mesh size gillnet for Nemipterus virgatus in South China Sea

摘要: 金线鱼刺网是南海区的主要渔具之一。根据近年来世界上刺网选择性研究常用的最大似然法原理，应用Normal、Gamma和Lognormal 3种常用的刺网选择性曲线模型，对1992年在南海区进行的45、50、55和60 mm网目尺寸金线鱼刺网捕鱼比较试验的渔获资料作了分析。结果表明，南海区金线鱼刺网的选择性最适合用Lognormal模型曲线公式描述。

Abstract: Nemipterus virgatus gillnet is one of the main fishing gears in South China Sea. According to the theory of maximum likelihood method of gillnet selectivity that rose in resent years, this paper uses the Normal, Gamma and Lognormal selectivity models, which are commonly used to describe gillnet selectivity curve, to analyze the catch data of Nemipterus virgatus from simultaneous fishing with 45, 50, 55 and 60 mm mesh sizes of gillnets in 1992. The results show that Lognormal model equation provide an adequate description for the selectivity curves of Nemipterus virgatus gillnet in South China Sea.