盐碱地池塘鱼鳖混养育成模式的研究

在盐碱地池塘中,研究了五种不同鱼鳖混养育成养殖模式,以其成活率、增重率、出池平均规格、饵料系数、饵料成本、每667m2纯利润和投入产出比等指标进行综合评定,结果表明:模式Ⅰ、模式Ⅱ和模式Ⅲ是盐碱地池塘较好的鱼鳖混养育成模式,模式Ⅳ和模式Ⅴ相对较差;在盐碱地池塘中,可采取中华鳖与滤食性鱼类鲢、鳙鱼混养的模式,也可采取中华鳖与鲢鱼、鳙鱼、草鱼一起混养的模式;在本研究条件下,中华鳖的适宜放养密度为4 500~7 500只/hm2,鲢鱼可放养2 250~3 900尾/hm2,鳙鱼可放养450~600尾/hm2,草鱼可放养3 000尾/hm2。

Model of polyculture of soft-shelled turtle and fish in saline-alkaline pond

Five kind of different patterns for mix raises of fish and turtles were studied in saline and alkali pond.By the quotas of survival rate,the average specification at put out,the rate of weight gain,the feed coefficient,the feed cost,the net profit,the rate put in and out and so on to carry on the synthesis evaluation,The result indicated that,patternⅠ,patternⅡ and patternⅢ were the better pattern for the mixed raises of fish and turtle in saline and alkali pond,patternⅣ and patternⅤwere relatively bad.The pattern that mixed turtle with the filter fish such as silver carp and bighead carp could be adapted and the pattern that mixed turtle with silver carp,bighead carp and grass carp could be also adapted in saline and alkali pond.Under this research condition,the suitable breeding density for Chinese turtle being was 300～500/667m2,and 170～260/667m2,30～40/667m2,and 200/667m2 for silver carp,bighead carp and grass carp respectively.