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Chinese Journal of Applied Ecology ›› 2003, Vol. ›› Issue (10): 1697-1700.

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Impact of trawl fishing on fisheries population components in East China Sea

FAN Wei1,2, ZHOU Sufang1, GUI Xuesen1, CHENG Yanhong1   

  1. 1. Key Laboratory of Marine and Estuarine Fisheries, Ministry of Agriculture East China Sea Fisheries Research Institute, Shanghai 200090, China;
    2. State Key Laboratory of Estuary and Coastal, East China Normal University, Shanghai 200062, China
  • Received:2001-11-09 Revised:2002-03-15

Abstract: Based on the recent 50 years two-boats trawl fishing data of some state-owned fisheries companies and recent 7 years single-boat fishing data of some areas in East China Sea, the trophic index (TI) and composition indexs of fishes of two-boats trawl and single-boat trawl were calculated and analyzed, which indicated that TIincreased before 1974 and decreased rapidly thereafter, while composition index decreased from the end of 1970s, but SD increased.The results of single-boat trawl also indicated that TIdecreased gradually.Long-term over-fishing of trawl was one of the main reasons of the change of fisheries population structure in East China Sea.All of these showed that there was an over-fishing in East China Sea, and the robust of fisheries population was lower.

Key words: Trawl fishing, Marine ecosystem, Trophic index, Composition index

CLC Number: