摘要
在实验室条件下对南方鲇幼鱼的最大摄食率进行了测定,并探讨了体重和温度等生态因子的影响:在同样的温度(25℃)条件下,最大摄食率(R^(max):J/g·d)随体重(W:g)的增加(8.72—127.4g)而下降,变幅为346.7—267.2J/g·d;二者的相关关系为: R_(max)=496.5W-0.1107。当实验鱼的初始体重相近(41.59—53.39g)时,在温度(T:℃)分别为15,20,25,27.5,30,32.5和35℃的条件下,最大摄食率分别是109.1,253.5,305.8,406.4,426.4,399.0和173.9J/g·d;二者的相关关系为: R_(max)=2692-392.0T+18.92T^2-0.2788T^3通过求导推算极值的方法,得到该种鱼的最佳食欲温度为29.15℃,此时的最大摄食率估计为436.2J/g·d。本文还推导出预测该种鱼在不同体重及不同温度下的最大摄食率模型为: R_(max)(4251-617.0T+29.87T^2-0.4402T^3)W-0.
The maximum food consumptions in the juvenile catfish imposed on different conditions were measured in the laboratory, and the maximum ration levels were calculated. At temperature of 25℃, the ration level decreased with weight increasing from 8.72 to 127. 4g and ranged from 346.7 to 267.2J/g.d.The correlation between the maximum level(Rmax:.J/g.d)and body weight(W:g)can be expressed as follow .For the fish with the similar initial body weight of 41.59 - 5 3. 39g, the maximum levels were 109, 1,253. 5, 305. 8, 406. 4, 426. 4, 399.0, and 1 73. 9 J/g.d at temperature of 15,20,25,27.5,30,32.5 and 35 ℃, respectively. The correlation between the level and temperature (T:℃) can be expressed as follow.Rmax = 2692- 392.0T + 18.92T2 - 0.2788T3By calculating the derivative of the expression to obtain the extreme value, the optimal temperature at which the species may have the maximum appetite of 436.2J/g.d can be estimated as 29.15℃The model for prediction of the maximum ration Jevel in the fish imposed on different body weights and temperatures was developed as follow:
出处
《生态学报》
CAS
CSCD
北大核心
1992年第3期225-231,共7页
Acta Ecologica Sinica
关键词
最大摄食率
体重
温度
南方鲇
fish energetics,maximum ration level,food consumption,body weight,temperature,Silurus meridionalis Chen.
