The relationship between CPUE and fish abundance based on ideal free distribution theory：take the large light purse seine fishery of mackerel in Yellow Sea and East China Sea as an example
YI Ming-hua, GUAN Wen-jiang, CHEN Xin-jun
1. Institute of Digital China, Peking University, Beijing 100871 ; 2. Provincial Geomaties Center of Jiangxi, Nanchang 330046; 3. The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai Ocean Univ. , Shanghai 201306, China
Abstract: Catch per unit effort （CPUE） remains a common index of abundance in fisheries and CPUE in proportion to fish abundance is always taken as a valid assumption, but the relationship between CPUE and fish abundance derived from fishery dependent data will be influenced by behavior of fishermen. In this paper, we analyze the relationship between the proportion of catch and effort allocated to different location in same time based on ideal free distribution theory and data in the large light purse seine fishery of mackerel in Yellow Sea and East China Sea. The results showed the prediction of ideal free distribution was approximately supported in north fishing ground, i. e. to a certain extent, the CPUE was equalized and was independent of the fish abundance, and, on the contrary, the effort may be in proportion to the abundance. Although the prediction was not supported in south fishing ground, the CPUE decreased with the standardized effort increasing as its value was larger than 26, which implied the interference competition was present and the relationship between CPUE and fish abundance may be weakened, even break down. Finally, we suggest we need to keep an eye on CPUE equalized when using the fish dependent data to research dynamic of fish resource .
易明华, 官文江, 陈新军. 基于理想自由分布理论对CPUE与渔业资源关系的探讨——以我国近海鲐灯光围网渔业为例[J]. 大连海洋大学学报, 2009, 24(4): 325-330.
YI Ming-hua, GUAN Wen-jiang, CHEN Xin-jun. The relationship between CPUE and fish abundance based on ideal free distribution theory：take the large light purse seine fishery of mackerel in Yellow Sea and East China Sea as an example. Journal of Dalian Ocean University, 2009, 24(4): 325-330.
2009, Vol. 24 
