商洋克,孙润隆,刘淑德,李建超,俞杰,王欣欣

• 1:中国海洋大学水产学院
• 2:山东省水生生物资源养护管理中心

摘要(Abstract)：

为了获得山东近海四种头足类的选择性曲线，同时评估头足类种群胴长的相对密度分布。本研究根据2016年10月山东近海底拖网调查数据，基于Logistic选择性曲线和最大体周估算选择率方法，得出渔获物中日本枪乌贼(Loligo japonica)、金乌贼(Sepia esculenta)、长蛸(Octopus variabilis)和短蛸(Amphioctopus fangsiao)的选择性曲线，依据选择性曲线的特点，估算被开发海区头足类种群胴长的相对密度分布。研究表明，日本枪乌贼、金乌贼、长蛸和短蛸的50%选择胴长(L_(0.5))为26.63、12.58、24.08和14.99 mm,L_(0.5)处的曲线斜率σ分别为1.62、53.75、36.65和37.78。胴长相对密度的分布结果如下：日本枪乌贼的相对密度最高，胴长相对密度随胴长增加而降低，优势胴长为10～20 mm;金乌贼、长蛸、短蛸的相对密度较低，胴长相对密度随胴长增加呈先上升后降低趋势，优势胴长分别为40～80 mm、45～85 mm和35～65 mm。本研究利用网具选择性曲线特点，评估被开发种群胴长的相对密度分布，研究结果可用于头足类资源的开发和合理保护。

关键词(KeyWords)： 头足类;拖网;选择性曲线;胴长;相对密度;山东近海

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(31802349)资助~~

作者(Author): 商洋克,孙润隆,刘淑德,李建超,俞杰,王欣欣

DOI: 10.16441/j.cnki.hdxb.20210105

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