FISHERIES RESEARCH INSTITUTE,MOA,TAIWAN

The experiments were conducted to investigate the temperature limitation on tolerance and feed intake and growth of juvenile jade perch, Scortum barcoo. Effects of temperature on the growth of fish were also elucidated. The initial temperature was 25 ℃ and was increased or decreased at the rate of 1 ℃ per hour. The upper and lower median lethal temperatures (LT50) were 36.2 ℃ and 13.7 ℃ respectively. The results of feeding trial indicated that the upper feeding temperature was from 37.0 to 38.0 ℃, and the lower feeding temperature was 15.6 to 16.5 ℃. In the growth trial, 60 juvenile jade perch (about 83.39 g) were stocked in thermo-regulated recirculating tanks at 20, 25 and 30℃ for 12 weeks, each tank containing 2.5 tons of fresh water. The results showed that both the growth rate and feed conversion ratio were better in fish reared at 30 ℃ than at 25 ℃and 20 ℃. The condition factor of fish at 25 ℃ group was significantly higher than that of 20 ℃ groups.