With the acceleration of China’s ecological civilization construction,the fishery has entered a new era of high-quality development.Eel,as one of the main freshwater aquaculture species of Fujian Province,the problem of its breeding tail water discharge has become increasingly prominent.Four primary treatment modes for eel culture in Fujian Province are currently employed.These modes include the conventional chemical treatment,the improved chemical treatment in industrial circulating water eel culture,the ecological comprehensive planting and breeding treatment,and the double circulation zero discharge eel culture treatment.This paper elucidates the primary technical processes and mode characteristics of eel culture tail water treatment.It also analyzes the key advantages and disadvantages of these processes and modes,and presents recommendations to promote future advancements in eel culture tail water treatment.The findings of this study serve as a valuable reference for enhancing aquaculture tail water treatment technology in Fujian Province,as well as nationwide.

Growth performance is an important character in the breeding of new varieties(strains) of fish,and the factors that affect the growth performance of cultured fish mainly include gene,environment aquaculture activities and human interference.From 1996 to 2021,120 fish breeding varieties were identified in China.but some of them were not applied to commercial.production due to the lack of a relatively unified evaluation standard or specification for testing technology.In this paper,the identification and testing technology status of new varieties(strains) of cultured fish were systematically introduced;the main influencing factors in growth performance test and evaluation were analyzed,and a set of technical suggestions were put forward for establishing test base,test platform,improving test design,strengthening breeding management,reducing human interference,scientific data collection,result evaluation and judgment.It could provide feasible technical reference for the construction of new fish varieties(strains) testing ground,scientific,standardized and fair testing and evaluation of new fish varieties(strains) in China,and could also provide reference for the construction and testing of other aquaculture varieties(strains) testing ground.