Abstract
Several commercially important characteristics of blue and channel catfish were compared for three successive growth periods. One-year-old blue ( Ictalurus furcatus) and channel catfish ( I. punctatus) averaging 111 g and 117 g, respectively, were stocked into triplicate 0.05-ha ponds at 9694 fish/ha in June 1987. The same fish were restocked at 8078 and 5132 fish/ha the following winter and summer, respectively. Growth, survival, and feed conversion of the two species during summer 1987 and 1988 were not significantly different ( P > 0.05), but growth and feed conversion were superior for channel catfish in the winter period; thus, channel catfish were significantly larger at the end of the winter and summer 1988 periods. Gonadosomatic indices were significantly lower in blue catfish than in channel catfish in summer 1987 and winter periods, but not different in 1988. Visceral fat percentage and whole body fat composition in blue catfish in summer 1988 were greater than in channel catfish. Protein level of whole body and fillets of the two species was not significantly different for any period. Winter whole body dress-out percentage was higher in blue catfish, but not different in summer 1988.
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