[Effects of environmental factors on catch distribution of stow net Pseudosciaena polyactis and Lophius litulon in southern Yellow Sea in spring].

Stow net fishery is one of the important fishing methods in southern Yellow Sea. Based on the 2006-2009 data from the stow net fishery resources survey in the southern Yellow Sea in spring, and by using the generalized linear model (GLM) and generalized additive model (GAM), this paper quantitatively analyzed the relationships between the catch distribution of Pseudosciaena polyactis and Lophius litulon and the environmental factors such as year, position, water depth, and sea surface temperature (SST). Compared with GLM model, GAM model could better explain the relationships between the spatiotemporal distribution of the catch per unit effort (CPUE) of P. polyactis and P. litulon and the environmental factors. There was a significant negative correlation between the CPUE of the two fish species. The P. polyactis' CPUE showed a decreasing trend from north to south along the latitude direction, being smaller especially around the Yangtze River estuary, and the L. litulon' s CPUE was also smaller near the Yangtze River estuary. The CPUE of the two species showed a significant correlation with the SST. The calculated optimal scale of the SST for L. polyactis and P. litulon was 9-11 degrees C and 9-14 degrees C, respectively.