利用塑料大棚缩短牛蛙冬眠期的研究

在东北地区，将牛蛙的幼蛙及蝌蚪放养在塑料大棚内的池塘里与在自然条件下越冬进行对比试验。结果表明：在东北地区，幼蛙生长期延长了８２ｄ，成活率提高了１７．５％，整个越冬期内净增重差异极显著（Ｐ〈０．０１），净增重率为２７４％；蝌蚪的生长期延长了９５ｄ，成活率提高了８．９％，净增重差异也极显著（Ｐ〈０．０１），净增重率为２３０％；有１２．６％的蝌蚪在越冬后期发生了变态。

Study on Shortening the Hibernating Period of Bullfrog (Rana catesbeiana) by Plastic Shed

A comparative test was gone on raising young bullfrogs and bullfrog tadpoles in Northeast for over winter in cultural pouds covered with plastic shed and that of under natural way The results showed that in Northeast by plastic shed,on the one hand for young bullfrogs,the growth period shot up by 82 days;The survival rate increased by 17 5%;The net increasing weight were significantly different( P <0 01)and the rate of net increasing weight was 274% On the other hand for bullfrog todpoles,the growth period went up by 95 days;The survival rate raised by 8 9%;The net increasing weight were significantly different( P <0 01) and the rate of net increasing weight was 230% Furthermore,metamorphosis appeared on 12 6% of bullfrog todpoles in the last part of over winter