为系统研究蓝点马鲛流刺网的网目选择性，2013年4—5月进行了110、115、120和125 mm 4种网目尺寸的渔获对比实验，采用选择性模型曲线法和鱼体型态系数法对网目选择性进行研究。结果表明，实验渔具具有很好的选择性，渔获优势种为蓝点马鲛和许氏平鲉，IRI值分别为18 626.8和2 740.1；选择性拟合效果以Gamma模型最好；鱼体型态系数法得出的目脚长度与叉长和体质量关系式分别为α=0.092 7l、α=4.59W^1/3；模型法和鱼体型态系数法推算的主捕3～4龄蓝点马鲛最佳网目尺寸分别为120.4和121.5 mm；目脚长度与最大横剖面的关系式为α=0.224S-5.37，以此得出的最佳网目尺寸为121.5 mm。以蓝点马鲛渔获群体的叉长和体质量历史数据，计算了捕捞各龄群体所对应的最适网目尺寸，供渔业生产参考。

In order to study the selectivity of Scomberomorus niphonius gillnet mesh systematically,four different meshes of 110,115,120 and 125 mm were tested during fishing operation from April to May 2013.Selectivity model curves and body shape coefficients were used to analyze the mesh selectivity.Results showed that ①The gillnet tested had good selectivity,the dominant species were Scomberomorus niphonius and Sebastes fuscescens with IRI values of 18 626.8 and 2 740.1,respectively.②Gamma model obtained the best goodness-of-fit with the selectivity model curves among the common models tested.③The formulae describing the relationship between mesh size(α)and fork length(l)or body weight(W)were α=0.092 7l and α=4.59W^1/3,respectively.④The formula describing the relationship between mesh size and maximum perimeter of body section(S)was α=0.224S-5.37.⑤The optimum meshes for catching 3-4 ages of S.niphonius were estimated to be 120.4 and 121.5 mm respectively by Gamma selective curve and the afore-mentioned formulae.The optimum meshes for different ages of S.niphonius were also calculated based on the historical fishing data.

公益性行业（农业）科研专项（201203018）；“泰山学者”建设工程专项（鲁政办发2008-67号）