Abstract
Abstract The use of three different types of catfish offal meals by fingerling channel catfish (Ictalurus punctatus) was investigated. These included: an experimentally produced formic acid catfish offal silage; a commercially produced catfish offal meal prepared by the conventional rendering process; and a commercially produced catfish offal protein hydrolysate. There was no significant difference in growth rate, protein efficiency ratio, or feed efficiency of fish fed either the catfish offal meal produced by rendering or menhaden fish meal. Fish fed either the formic acid catfish offal silage or the catfish offal protein hydrolysate had a significantly lower growth rate, protein efficiency ratio, and feed efficiency than fish fed menhaden fish meal. The decreased performance of the catfish offal protein hydrolysate could be attributed to a marginal or slightly deficient presence of certain amino acids. It is unclear what factors in the formic acid catfish offal silage may have inhibited its use; the re...
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