Effects of ration, temperature and body weight on metabolism in young black porgy

Feeding-growth experiments on black porgy,Sparus macrocephalus, were carried out at four ration levels from starvation to satiation and four temperatures ranging from 14.8° to 26.8°C. The energy budget was used to calculate the metabolism in black porgy. Resting metabolism correlated significantly with body weight in power function at 24.4°, 20.1° and 14.8°C (R _s=aW ^b). The model predicting resting metabolism was obtained as:R _s=0.0834W ^0.8763·e ^0.0319T . The feeding metabolism correlated linearly with ration level and food consumption. The predicting model of feeding metabolism is:R _F=0.5631+0.0341·T−0.0013C·W·T+0.0010W·T+0.0219C·W−0.3335C. Using ln(RL+1), lnW, lnT and their interaction terms as independent variables, the prediction model of total daily metabolism was obtained by stepwise regression as: lnR _T=−1.7328+0.3936lnW+1.1882ln(RL+1)−0.2823ln(RL+1)lnT+0.1555lnWlnT. Contribution No. 3397 from the Institute of Oceanology, Chinese Academy of Sciences. Project 39370542 supported by NSFC and study also supported by National Key Laboratory in the Institute of Hydrobiology, Chinese Academy of Sciences.