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Comparison of processing yield and nutrient composition of cultured Nile tilapia (Oreochromis niloticus) and channel catfish (Ictalurus punctatus)

1994; Elsevier BV; Volume: 119; Issue: 2-3 Linguagem: Inglês

10.1016/0044-8486(94)90184-8

1873-5622

S. L. Clement, Richard T. Lovell,

Fatty Acid Research and Health

Nile tilapia and channel catfish were grown from fingerling to harvest size with the same commercial diet. The catfish were harvested from a 0.04-h earthen pond at an average size of 610 g and the tilapia were taken from 1-m3 circular raceways at an average size of 585 g. Both groups of fish were fed to satiation for a 180-day summer feeding period. Twenty fish were randomly collected from each group for determination of processing yield and 10 fish were collected from each group for determination of selected nutrient composition. Processing yield (total fish weight minus weight of head, skin and viscera) was lower for tilapia (51.0% as compared to 60.6% for channel catfish). Fillet yield was also lower for tilapia (25.4% as compared to 30.9%). Fat content of fillet was lower for tilapia (5.7 g/100 g as compared to 7.4 g/100 g). Protein content of fillet was higher for tilapia (20.3 g/100 g compared to 17.3 g/100 g). Caloric value of fillet was lower for tilapia (139 kcal/100 g compared to 144 kcal/100 g). Fatty acid composition of fillet lipids was similar for the two species; monounsaturates comprised an average of 54.6 g/100 g of total fatty acids and n−3 highly unsaturated fatty acids comprised an average of 2.2 g/100 g of total fatty acids. Cholesterol contents of fillet were 31.3 mg/100 g for tilapia and 37.1 mg/100 g for catfish. Amino acid content was similar for the two species. Mineral composition of fillet was similar except that tilapia had higher concentrations of sodium and magnesium and catfish had higher concentrations of potassium and phosphorus.