Abstract:

The paper aims to study the large-scale freshwater fish farming and industrial space optimization. Based on the standard ellipse model, the grass carp with the largest output of freshwater fish was selected as the research object. The spatial distribution pattern (agglomeration degree, gravity center, scope and direction), evolution characteristics and influencing factors of grass carp industry development were analyzed based on the scale of grass carp industry in 31 provincial-level administrative regions of China from 2006 to 2016. The spatial agglomeration of grass carp industry in China shows a trend of discrete agglomeration. The steady increase of output in the upper and middle reaches of the Yangtze River basin and the enlargement of grass carp culture in arid and semi-arid areas in northwest China have promoted the shift of the standard ellipse of grass carp industry to the west and north. The spatial distribution of grass carp industry development presents decentralized agglomeration. Grass carp farming gradually changes from extensive farming to fine farming. The spatial transmission mechanism of grass carp industry development is from the central and eastern regions to the west and north. This is mainly due to the good environmental adaptability of grass carp, relatively low cost in the central and western regions and the expansion effect of the market.

Key words: grass carp, freshwater aquaculture, space distribution, evolution, standard ellipse