蓝点马鲛大网目流刺网的选择性研究  

The selectivity research of big mesh gillnet for Scomberomorus niphonius

作　　者：尤宗博 李显森[1] 赵宪勇[1] 王新良[1] 孙珊[1] 孙中之[1] 朱建成[1] 

机构地区：[1]中国水产科学院黄海水产研究所、农业部海洋渔业可持续发展重点实验室、山东省渔业资源与生态环境重点实验室,山东青岛266071 [2]上海海洋大学海洋科学学院,上海201306

出　　处：《水产学报》2014年第2期289-296,共8页Journal of Fisheries of China

基　　金：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)

摘　　要：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125mm4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鲇，IRI值分别为18626．8和2740．1；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=0．09271、α=4．59W1/3；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121．5mm；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121．5mm。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 ①）The 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（a）and fork length（l） or body weight（W） were α = 0. 092 71 and α= 4.59W1/3, respectively. ④The formula describing the relationship between mesh size and maximum perimeter of body section （S）wasα = 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.

关 键 词：蓝点马鲛 流刺网 选择性 网目 极大似然法 

分 类 号：S972.1[农业科学—捕捞与储运]