Related factors on natural spawning rate of Channel Catfish were been studied,including natural spawning in different parent fish ages,stocking densities,spawning tank type,feed type,local climatic and pond sediment type.

Based on review of international literatures about sex ratio at birth and its influence factors,author analyzed long-term dynamic tendency and race difference of sex ratio at birth in some developed countries,and probed into relationship between age of mother and sex ratio at birth using the relevant data of vital statistics,aimed at furthering the recognition about sex ratio at birth.

Research advances of essential fatty acids of marine broodstock and larval;

Analysis of lipid and fatty acid compositions in different tissues of the wild-caught Pampus cinereus broodstocks;

Lipid and fatty acid composition of broodstock diet have beenidentified as major dietary factors that determine successful reproduction and survival of offspring, and most of the reports availableon broodstock nutrition are about lipid nutrition.

The results showed that mature brood fish was injected with DOM and LRH-A2 for spawning inducing,artificial reproduction can be successful.

The artificial propagation techniques of Erythtoculer ilishaefornis including brood fish selection, methods of brood fish transport and intensive cultivation,successful hormone induction, hatchery management etc were studied in Huzhou of Zhejiang during the years from 2002 to 2003.