关键词: 鳜, 池塘养殖, 浮游植物, 浮游动物

Abstract: The plankton composition was studied in six mandarinfish Siniperca chuatsi ponds and bait fish ponds in the breeding base in Qingyuan City,Guangdong Province during hot and rainy seasons.The results showed that lower total biomass of plankton were generally observed in the epidemic ponds than in other ponds.Microcystis sp,Oscillatoria sp and other Cyanobacteria were found the dominant phytoplankton species.In addition,Margalef abundance index and Shannon-weaver index were found at a low level when the hemorrhage symptoms appear in the fish,indicating that these two indices were used as disease warning index in reference pond.Read phonetically The water quality should be regulated,especially at poor weather for the diseased ponds,so that biomass and composition of plankton were stable in practices.

Key words: Siniperca chuatsi, fish culture in pond, phytoplankton, zooplankton