【摘要】 牛蛙生长的最适温度为25~32℃,繁殖的最适温度为20~30℃.牛蛙以动物性食物为主,在不同的发育阶段,食性也不尽相同.当水温升到18℃以上时,牛蛙开始发情.牛蛙的产卵量与年龄、个体大小、营养条件及生态条件等有很大关系,一般情况下,产卵量自1万至5万粒不等.卵孵化的最适水温为25~28℃.蝌蚪完成变态发育需要77d.每年11月下旬至翌年3月份为牛蛙的越冬期.更多还原

【Abstract】 The most suitable temperature for the growth of the bullfrogs is 25 ~ 32 ℃,and for the breeding it is 20 ~ 30℃.The bullfrogs live on animal food and their feeding habits vary in different development phases.When water temperature rises to over 18 ℃,the bullfrogs begin estrus.The fecundity of the bullfrogs is closely related with their ages,individual sizes,the nutrition and the ecological conditions.Generally,the fecundity ranges from 10,000 to 50,000.The most suitable water temperature for the ovum hatching is 25～28℃.It takes 77d for the tadpole to finish metamorphosis.Every year from December to next March the bullfrogs begin overwintering.更多还原