温度对宽体金线蛭生长的影响

目的]研究不同温度对宽体金线蛭的生长的影响，为宽体金线蛭的人工养殖提供科学依据。方法]随机分为4个试验组，在不同温度（15、20、25、30℃）下养殖20d，每组2d测1次体重，比较各组宽体金线蛭的日增重。结果]15、20、25、30℃条件下平均日增重分别为2．04％、2．99％、3．23％、0．62％。在15～20℃范围内，随着温度的升高其生长明显加快（P〈0．05）；20～25℃平均日增重率最高，达到2．99％～3．23％，差异不显著（P〉0．05）；超过30℃则宽体金线蛭生长显著下降，存活率为55％。结论]宽体金线蛭生长的适宜温度是20～25℃。

Effect of Water Temperature on Growth of Leech (Whitmania pigra)

Objective] The paper aimed to study effects of different water temperature on growth of leech (Whitmania pigra) and provide a scientific basis for breed culture. Method] The experiment animals were divided into 4 groups at random, and bred in 20 days under different temperature conditions (15,20,25,30 ℃), weighted interval 2 days, the average daily gains of leech in each groups were compared. Result] Average daily weight increased 2.04%,2.99%,3.23%,0.62% under the 15, 20, 25,30 ℃. When the temperature raise from 15 ℃ to 20 ℃, the growth of leech increased became faster (P<0.05). Rates of average daily gain of leech became highest when achieved 2.99%-3.23% under range of 20-25 ℃,no significant difference (P>0.05). When the temperature was higher than 30 ℃, the growth and the livability of the leech significantly reduced(P<0.05), survive rate was 55%. Conclusion] The range of the optimal temperatures for leech growth is from 20 ℃ to 25 ℃.