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Decadal Population Traits and Fishery of Largehead Hairtail, Trichiurus lepturus (Linnaeus, 1758) in the East China Sea

Decadal Population Traits and Fishery of Largehead Hairtail, Trichiurus lepturus (Linnaeus, 1758) in the East China Sea

Sher Khan Panhwar1,2,3, Zhou Yong Dong1,4,*, Gao Tianxiang1,3, Wang Ping5, Han Zhiqiang1, Wang Zhongming1,4 and Wang Yang1,4

1Marine Fisheries Research Institute of Zhejiang Province, China
2Fisheries College, Zhejiang Ocean University, Zhoushan, China
3Center of Excellence in Marine Biology, University of Karachi, Sindh, Pakistan
4Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resource of Zhejiang Province, Zhoushan, Scientific Observing and Experimental Station of Fishery Resources for Key Fishing Grounds, Ministry of Agriculture, China
5College of Pharmaceutical Sciences,, Zhejiang University of Technology, Hangzhou, China

*      Corresponding author: zyd511@126.com; 
sk.panhwar@uok.edu.pk

ABSTRACT

Largehead hairtail, Trichiurus lepturus, fishery status in the East China Sea was estimated using length frequencies data sets for 2001, 2004, 2009 and 2013 and catch and effort data from 2000~2012. Length frequency data for 8,350 individuals were collected using pair trawl nets. The predominant size classes in the catch comprised of 130−374 mm in 2001, 83−360 mm in 2004, 53−355 mm in 2009, and 23−389 mm in 2013. Growth parameters of asymptotic length ranged from 515.6 to 768.6 mm in 2004 and 2009, growth coefficients ranged from 0.230 to 0.685, and t0 from -0.654 to -0.494. The rate of total mortality (Z) ranged from 0.82 to 2.73 year-1 in 2013 and 2001, respectively. The exploitation rate was estimated to range from 0.660−0.797 year-1. Catch per unit effort estimates showed a consistent decline in catches. This study is a start to bridge the gap between data and information, allowing resource managers to determine management priorities for this economically and ecologically important species in the ECS.
 

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Pakistan Journal of Zoology

June

Vol. 50, Iss. 3, Pages 799-1198

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