The structure of catch and growth characteristics of Chinese snakehead fish, Channa argus (Cantor), was analysed based on the samples collected during April～May of 1992 and 1993.

Changes of fishing structure and biodiversity before and after three years′ spring fishing off were analyzed and the effects of the spring fishing off were assessed preliminarily according the monitoring data by drift net in Yibin,Banan and Wanzhou reaches of the upper Yangtze River in 2000～2005.

Primary studies on structure of fishery community and species diversity in Changshu section of the Yangtze River;

Research into the First Generation of Communist Intellectuals Group Structure;

The Study of Social Group Structure for the Village in the City;

Objective To explore the present group structure and development tendency of clinical department heads of affiliated hospitals of a military medical university.

The population structure of the single japonica rice cropping with super-high yield;

Comparison of plant morphology and population structure and photosynthetic characteristics among a series of near-isogenic lines with different leaf rolling index in rice;

Effect of population structure on the yield and chalky rice rate in hybrid rice;