黄海区虾拖网网囊网目选择性研究  

Study on the Selectivity of the Codend Mesh of the Shrimp Trawl in the Yellow Sea

作　　者：唐衍力[1] 孙国微[1] 杨炳忠[1] 赵同阳[1] 黄六一[1] 梁振林[1] 

机构地区：[1]中国海洋大学水产学院,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2010年第10期33-37,共5页Periodical of Ocean University of China

基　　金：国家科技支撑计划项目(2006BAD09A05);农业部项目"渔具渔法专项调查与渔具选择性专题研究"资助

摘　　要：在黄海区的山东近海,采用套网法对网目尺寸为30,33和40 mm的虾拖网网囊进行了选择性试验。使用Lo-gistic曲线作为选择性模型,求得不同网目尺寸的网囊对鹰爪虾(Trachypenaeus curvirostris)的体长选择性曲线,并运用极大似然法对渔获数据进行处理,同时估算选择性参数。结果表明,在网目尺寸为30,33和40 mm时主捕虾类鹰爪虾的选择体长L50分别为59.8,60.1和63.2 mm,选择范围SR分别为14.4,16.0和22.9 mm,选择性参数随网目尺寸的增加呈线性增大。鹰爪虾的选择体长L50与网囊网目尺寸m的线性回归方程为L50=0.353m+48.944,R2=0.956。根据试验结果并结合历史资料,认为目前33 mm的网囊网目尺寸对于保护鹰爪虾类资源是比较合适的。The selectivity of codends with mesh sizes, 30mm, 33mm, and 40mm, has been tested in the Yellow Sea by using the cover-net method. Based on the Logistic equation model, curves about the selectivity of the three codends to the target species, Trachypenaeus curvirostris, were obtained. The catching data was analyzed and selectivity parameters were estimated by using the maximum likelihood method. The result shows that when the mesh sizes were 30 mm, 33 mm, and 40 mm, the 50% selection lengths （L50） were 59.8 mm, 60. 1 mm, and 63.2 mm, respectively; while the selection ranges （SR） were 14. 4 mm, 16.0 mm, and 22. 9 mm, respectively. Both selectivity parameters increase as the mesh sizes enlarge. The linear regression equation of the Trachypenaeus curvirostris between the 50 % selection length （L50） and the mesh size of the codend （m） is L50=0. 353m＋48. 944, R^2=0. 956. Based on this result and the previous research, the author conclude that the 33 mm mesh size is more suitable for protecting the Trach ypenaeus curvirostris resources.

关 键 词：虾拖网 网目选择性 鹰爪虾 

分 类 号：S972.1[农业科学—捕捞与储运]