Abstract
Tilapia nilotica (black/blue skin coloration) and a hybrid of tilapia (red skin coloration( were bred and raised under the same environmental conditions and feeding regimen. After one growing season, the variety of fish designated as “Blue” tilapia (BT) were slightly larger than the variety of fish designated as “Red” tilapia (RT). Muscle tissue of BT was also fatter than RT due to a greater deposition of triacylglycerolds. Total lipid, triacyglycerol and phospholipid fractions from muscle tissue of RT were characterized as having significantly larger quantities of polyunsaturated fatty acids than BT. RT muscle tissue contained 27.04 and 4.55 ìg/g dry weight of alpha-and gammatocopherol, respectively. Based on the fatty acid and tocopherol content of the muscle tissues, RT would be expected to be the least stable to lipid oxidation.
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