Introduction:

The hybrid generally performs better than either parent for several important production traits, including survival, growth, disease resistance, and carcass yield (Dunham et al. 1990; Wolters et al. 1996; Bosworth et al. 2003). Economic analyses indicate that hybrid catfish fingerling and food fish production are generally more profitable than channel catfish at moderate feed prices, even though the cost of fry and fingerlings are higher and more capital is required to produce hybrids (Ligeon et al. 2004a, b). Because of the progress of innovative breeding technologies, there is more interest in producing hybrid catfish. Currently, hybrid catfish account for about 20% of total catfish produced in the United States (personal communication, Brian Bosworth of USDA-ARS at Stoneville, Mississippi). However, relatively little is known about nutrition and feeding specific to hybrid catfish. Data presented in this report were derived from five experiments conducted in ponds to evaluate dietary protein levels, alternative feedstuffs, and feeding rates and frequencies on the performance of hybrid catfish.
Experiment 1

Three diets containing 28%, 32%, or 36% protein (Table 1) were evaluated to determine optimum dietary protein levels for hybrid catfish. Diets were manufactured at the Delta Western Research Center in Indianola, Mississippi. Fingerling hybrid catfish averaging 103 pounds per 1,000 were stocked in 0.1-acre ponds at 7,000 fish per acre and fed once daily to apparent satiation for 151 days.

Experiment 2

Corn gluten feed or a combination of corn gluten feed and cottonseed meal was evaluated as partial replacements for soybean meal and corn in hybrid catfish diets. Five 28%-protein diets were included (Table 2). The diets were manufactured at the Delta Western Research Center. Fingerling hybrid catfish averaging 99 pounds per 1,000 were stocked in 0.1-acre ponds at 6,000 fish per acre and fed once daily to satiation for 179 days.

Experiment 3

This experiment examined the use of solventextracted distillers’ grains with solubles (SE-DDGS) in hybrid catfish diets. Four diets containing 28% or 32% protein with or without SE-DDGS were included (Table 3). The diets were manufactured at Fish Belt Feed Mill in Moorhead, Mississippi. Fingerling hybrid catfish averaging 103 pounds per 1,000 were stocked in 0.1-acre ponds at 6,000 fish per acre and fed once daily to satiation for 172 days.

Experiment 4

Experiment 4 compared feeding once versus twice daily on production characteristics of pond-raised hybrid catfish. Fingerling hybrid catfish averaging 143 pounds per 1,000 were stocked in 1-acre ponds at 5,000 fish per acre and fed once or twice daily to satiation for 165 days. A commercial 28%-protein diet was used.

Experiment 5

Experiment 5 was conducted to examine effects of feeding to satiation versus feeding at various daily feeding rates on production characteristics and size distribution of hybrid catfish in production ponds. Fingerling hybrid catfish averaging 99 pounds per 1,000 were stocked in 0.1-acre ponds at 6,000 fish per acre and fed once daily to satiation or no more than 100, 120, and 150 pounds for 195 days. A commercial 28%-protein diet was used. Simple regression analysis was conducted for weight gain, net yield, and FCR against total amount of diet fed.
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