Acoustic characteristics of the tiger frog,Hoplobatrachus rugulosus,during the breeding season

We recorded and described the calls and acoustic characteristics of the male tiger frog,Hoplobatrachus rugulosus,in an artificial pond during mating season.Spectral and temporal call parameters,along with call intensity were analyzed.Three harmonics were distinguishable from the spectrogram.Four patterns of dominant frequency were found in calls produced late at night,i.e,3 patterns in the first harmonic（located in 500 Hz section,700 Hz section,and 800 Hz section respectively） and 1 in the second harmonic（located in 1 800 Hz section）.Call duration,call duty cycle,call intensity,and pulse rate were highly variable among different patterns of dominant frequency.These call properties could provide valuable evidence for further ecological study of this species.

豆粕替代鱼粉对泰国虎纹蛙生长性能的影响

为了探讨发酵豆粕代替鱼粉对泰国虎纹蛙(Hoplobatrachus rugulosus)生长性能的影响,该研究选用180只规格为24g/只~28g/只的泰国虎纹蛙为试验对象,试验共设置6个处理小组。根据发酵豆粕代替鱼粉的比例,分别为0%组、20%组、40%组、60%组、80%组和100%组。每个小组的泰国虎纹蛙30只,分3个重复,每个重复10只。试验为期60 d。结束后测定泰国虎纹蛙的增重情况。试验结果显示,发酵豆粕代替鱼粉对泰国虎纹蛙的摄食率和成活率影响不显著;增重率0%组和20%组的差异不显著;40%组、60%组和80组和0%组对比差异不显著,但是显著地低于20%组(P<0.05);100%组的增重率最低,显著地低于对照组、40%组、60%组和80%组(P<0.05),极显著地低于20%组(P<0.01);饲料效率以20%组的最高,但是和0%组、40%组、60%组和80%组的差异不显著,显著地高于100%组(P<0.05)。试验结果表明,以20%的发酵豆粕替代鱼粉,可以提高泰国虎纹蛙的生长性能。