拉氏池塘苗种培育试验

Fry and Juvenile Rearing of Fat Minnow Phoxinus lagowskii Dybowski in an Earthen Pond

在辽宁凤城和辽宁盘锦分别进行了土池拉氏夏花、1龄秋片苗种培育生产性试验。夏花培育池0.27hm2,轮虫高峰期下塘拉氏水花鱼苗12.1万尾。经30d培育,鱼苗的平均全长达37.90mm,增长5.6倍,平均体质量达0.51g,增长510倍,出塘拉氏夏花7.9万尾,成活率65%。1龄秋片苗种培育试验池塘面积0.19hm2,放养夏花8万尾,平均全长4.5cm,平均体质量0.8g,经110d培育,平均全长达10.46cm,增长2.3倍,平均体质量达17.76g,增长22.2倍,最大个体20g,出塘秋片鱼种76 800万尾,1363.96kg,成活率96%,饵料系数1.6,平均7306.5kg/hm2。

Experiments on fry and juvenile rearing were conducted in Fengcheng city and Panjin city in Liaoning Province to optimize the fish breeding technology for fat minnow Phoxinus lagowskii Dybowski summerlings ,and yearlings .A total of 121 thousand fry were cultured in a 0 .27 hm^2 pond with high rotifer density for 30 days ,and 79 thousand summerlings with average total body length of 37 .90 mm and body weight of 0 .51 g were obtained ,with body length increment of 5 .6 times ,body weight gain of 510 times ,and survival rate of 65% .A total of 80 thousand summerlings with total body length of 4 .5 cm were cultured in a 0 .19 hm^2 pond for 110 days ,and 76 .8 thousand yearlings with average total body length of 10 .46 cm and body weight of 17 .76 g （the maximum body weight 20 g） were harvested at a rate of 7306 .5 kg per hm^2 pond ,with body length increment of 2 .3 times ,body weight gain of 22 .2 times ,and survival rate of 96% ,and feed conversion ratio of 1 .6 .The findings suggest that the fry and juveniles of fat minnow can be cultured in an earthen pond .