Protein and energy requirements of fingerling channel catfish for maintenance and maximum growth.
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In two separate experiments, purified diets containing 25% crude protein and 2.85 kcal/g and 35% crude protein and 3.99 kcal/g were fed at incremental rates [0-5% of body weight (BW)/d] to fingerling channel catfish (Ictalurus punctatus) in aquaria for 8 wk. Linear (r2 = 0.95) increases in growth rate were observed in each experiment with increases in feeding rate up to 8.75 g protein/(kg BW X d) and 99.75 kcal energy/(kg BW X d). Regressing growth rate back to zero resulted in maintenance requirement values of 1.32 g protein/(kg BW X d) and 15.06 kcal energy/(kg BW X d) for experiment 1 and 1.32 g protein/(kg BW X d) and 15.08 kcal energy/(kg BW X d) for experiment 2. Net gains in body protein and energy also increased linearly (r2 = 0.93) with increasing feeding rates up to 8.75 g protein/(kg BW X d) and 99.75 kcal energy/(kg BW X d) in both experiments. Regression equations from these data predicted 1.07 g protein/(kg BW X d) and 17.00 kcal energy/(kg BW X d) in experiment 1 and 1.00 g protein/(kg BW X d) and 17.33 kcal energy/(kg BW X d) in experiment 2 was required to maintain a constant amount of protein and energy in catfish tissue. These requirement values for maintenance and maximum gain agree closely with those predicted from growth data.
author list (cited authors)
Gatlin, D. M., Poe, W. E., & Wilson, R. P.