高温季节鳜及饵料鱼池塘浮游生物调查研究

于高温多雨季节对广东省清远市鳜养殖基地的6个鳜（Siniperca chuatsi）及饵料鱼养殖池塘发病前后的浮游生物组成进行了调查分析。结果表明,易发病池塘,水中浮游生物总生物量比其他池塘略低。浮游植物优势种均为微囊藻（Microcystis sp.）,颤藻（Oscillatoria sp）等蓝藻。此外,池塘出现出血病症状时,浮游生物的马格利夫（Margalef）丰度指数和香农（Shannon-weaver）多样性指数均处于较低水平,这两项指数可作为池塘发病的预警参考指标。在实际生产中,平时应注意调节水质,以稳定水中浮游生物的数量和组成,在天气不佳时更应多加巡塘,以便及早发现病情。

The Plankton Composition in Mandarinfish Siniperca chuatsi Ponds and Bait Fish Ponds in Hot Season

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.