Abstract: Using juvenile Oplegnathus fasciatus(initial body weight 5.46 g) as experiment objects, we have studied the effects of different levels of salinities (175‰, 22.5‰, 27.5‰, 32.5‰, 37.5‰ and 42.5‰) and temperatures (18℃, 22℃, 26℃ and 30℃) on the growth and energy budget. The results showed that the specific growth rate (SGR), consumption rate (CR), conversion efficiency (CE) and energy budget of juvenile Oplegnathus fasciatus were affected significantly by salinity and temperature, but the energy absorption efficiency (AE) was not affected. The SGR, CR, CE, AE and growth energy of juvenile Oplegnathus fasciatus reached a maximum level when the salinity was 22.5‰ and temperature 22℃. However, the distribution rate of feces energy, excretion energy and metabolizable energy were all at a lower level under this condition. These results implied that the energy distribution pattern of juvenile Oplegnathus fasciatus was the best under these conditions and it was the best culture environment of juvenile Oplegnathus fasciatus. The optimal energy equation at this level was: 100.00C=7.97F+8.66U+26.47G+56.90R(salinity 225‰)；100.00C=11.52F+6.13U+18.96G+63.39R(temperature 22℃). The results demonstrated that juvenile Oplegnathus fasciatus is a type of fish with high metabolism activity but low-growth rate．

Key words: Oplegnathus fasciatus, salinity, temperature, energy budget