Size selectivity of gillnets for narrowbarred king mackerel Scomberomorus commersoni in South China Sea
YANG Bing-zhong，YANG Lin，TAN Yong-guang，ZHANG Peng，YAN Lei，CHEN Sen，LIJie
Key Laboratory of South China Sea Fishery Resources Exploitation&Utilization，Ministry of Agriculture，South China Sea Fisheries Research Institute，Chinese Academy of Fishery Sciences，Guangzhou 510300，China
Abstract: Fishing experimentswere carried outby gillnetswithmesh size of80，100，120，138，142 and 160 mm in northern South China Sea in March 2015 to investigate the size selectivity of gillnets for narrowbarred kingmackerel Scomberomorus commersoni.The selectivity data of gillnetswere simulated and evaluated based on the SELECT （Share Each LEngth's Catch Total）method by both Normal and Bi-normalmodels.A total of 172 individuals of narrowbarred kingmackerelwere captured and most captured by the gillnets.There was bettermodeling result in estimated splitmodels，in both Normal and Bi-normalmodels，than that in equal splitmodels.The estimated split model of Bi-normal showed the best fit to the catch data，and was chosen as the best fitmodel.The first and second of themodal relative length of thismodelwas4.439 9 and 6.727 8，respectively.The order of relative fishing intensity of gillnets to narrowbarred kingmackerelwas ranged as138mm＞142mm＞160mm＞100mm＞80mm＞120 mm.The fishingmechanism of gillnets to narrowbarred kingmackerel，the shape of selectivity curve and the use of SELECTmodel were discussed in this article.The findings can be used to promulgateminimalmesh size of gillnets for narrowbarred kingmackerel in South China Sea.
杨炳忠, 杨吝, 谭永光, 张鹏, 晏磊, 陈森, 李杰. 南海马鲛流刺网网目对康氏马鲛的选择性研究[J]. 大连海洋大学学报, 2016, 31(2): 199-204.
YANG Bing-zhong, YANG Lin, TAN Yong-guang, ZHANG Peng, YAN Lei, CHEN Sen, LIJie. Size selectivity of gillnets for narrowbarred king mackerel Scomberomorus commersoni in South China Sea. Journal of Dalian Ocean University, 2016, 31(2): 199-204.
2016, Vol. 31 
