The Effects of Water Velocity on the Growth,Dressout, and Body Composition of Channel Catfish,Ictalurus punctatus,Raised in Cicular Tanks

Research was conducted to determine the influence of water velocity on growth, dressout characteristics and fillet proximate composition of channel catfish, Ictalurus punctatus, raised in circular tanks. In this study, channel catfish cultured in water velocities of 4 cm/second averaged 75 g/fish higher weight gain and 0.12%/day greater specific growth rates than channel catfish cultured in tanks having no water velocity (P < 0.05). Channel catfish cultured at water velocities of 4 cm/second had significantly higher (P < 0.05) feed conversion efficiency and condition factor than channel catfish cultured in tanks having no water velocity. Channel catfish cultured at water velocities of 4 cm/second had significantly higher (P < 0.05) percentage carcass weight, fillet weight, and fillet moisture. The percentage visceral and fillet fat of channel catfish cultured at 4 cm/second was significantly lower (P < 0.05) than that for channel catfish raised in tanks having no water velocity. These results indicate that when cultured from initial weights of approximately 100 g to final weights exceeding 454 g in an environment having a water velocity of 4 cm/second, channel catfish have greater growth, dressout and lower fat levels than channel catfish produced in tanks having the identical water exchange rates but no water velocity.