温度对宽体金线蛭生长的影响

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

[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℃。

[ 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. [ Resuh] 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 ℃.