GROWTH PERFORMANCE AND ITS GENOTYPE-ENVIRONMENT INTERACTION ANALYSIS OF CHINESE MITTEN CRAB(ERIOCHEIR SINENSIS)POPULATIONS FROM THE YANGTZE RIVER AND THE LIAOHE RIVER IN PONDS

Culture experiment of two-year old crabs of the Yangtze River population and the Liaohe River population were conducted in Gaochun,Jiangsu province and Jixi,Anhui province simultaneously.(1)There is no significant difference in growth performances between the Yangtze River population and the Liaohe River population under the same management from April to September(P0.05).(2)Harvest weight of the Yangtze River population in October was higher than that of the Liaohe River population harvested in September(P0.05),because the Yangtze River population grew one month longer than the Liaohe River population.(3)Survival of the Yangtze River populations was higher than the Liaohe River population(P0.01).(4)Weight of male crabs of two populations were higher than females(P0.01),while the difference was enlarged in July and August for the Liaohe River population and in August and September for the Yangtze River population.(5)Growth and survival between two populations under stress of environment condition of Jixi were lower than that of Gaochun(P0.01).There were significant interactions between environment and population(P0.01),environment and sex(P0.01).It means growth dominance of the Yangtze population and male crab of each population would be expressed in optimal environment but not in poor environment.