JOURNAL OF NATURAL RESOURCES ›› 2007, Vol. 22 ›› Issue (4): 606-612.doi: 10.11849/zrzyxb.2007.04.011

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

The Effect of Summer Closed Fishing and the Reasonable Utilization on Hairtail (Trichiurus japonicus) Resources in the East China Sea Region

YAN Li-ping1, HU Fen1, LI Sheng-fa1, LIU Yong1, ZHOU Yong-dong2, LIU Zi-fan2   

  1. 1. East China Sea Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Marine and Estuarine Fisheries, Ministry of Agriculture, Shanghai 200090,China;
    2. Marine Fisheries Institute of Zhejiang, Zhoushan 316100, China
  • Received:2006-10-26 Revised:2007-04-20 Online:2007-08-25 Published:2007-08-25

Abstract: Based on the data analysis on age of hairtail(Trichiurus japonicus) in the East China Sea Region from 2002 to 2003 and research result cited on fishery biology in previous studies,which were basis of the coefficient of mortality and dynamic pool model,the effect of summer closed fishing on hairtail resources,the resources utilization status,and the alteration of hairtail fishery utilization status were analyzed by the Ricker population dynamic pool model.The results showed that:as present fishery condition(tc=0.5yr,F=2.61/yr)stands,the average annual resources,catch and average individual body weight could be increased by 87%,29% and 42%,respectively,as a result of the enforcement of three months summer closed fishing in the East China Sea.Although the status of hairtail resources utilization was over-fishing,it could still endure the heavy fishing stress.The main aspect of unreasonable utilization on hairtail resources was that the ratio of young fish in the catch was high.The individual in the catch was too small comparatively,with the average body weight being 75g/ind.Compareing with F,tc influenced Y/R more greatly.The constant maintenance of the summer closed fishing policy was suggested.At the same time,reducing the fishery stress and magnifying the fishery net size should be viewed as the central aim of the hairtail resources management in the future,which is also the reasonable strategy on hairtail resources utilization at present.

Key words: Trichiurus japonicus, summer closed fishing, Ricker population dynamic pool model, effect assessment, resources utilization, East China Sea Region

CLC Number: 

  • S932.4