Feeding channel catfish, Ictalurus punctatus, diets amended with refined marine fish oil elevates omega-3 highly unsaturated fatty acids in fillets.

摘要

Channel catfish, Ictalurus punctatus, 88.4+or-2.6 g/fish, were fed a basal diet amended with 4% of three processed menhaden, Brevoortia tyrannus, oils. These were compared with basal diets amended with 4% corn oil or 4% canola oil. Three replicate aquaria of nine fish each were fed assigned diets twice daily. At 6 wk, fish were group weighed, fillets were collected for sensory evaluation, fatty acid analysis by gas chromatography (GC). In a second study, catfish, 118.8+or-3.2 g/fish, were stocked into fifteen 0.04-ha earthen ponds and fed once daily for 16 wk one of four diets containing 2 or 4% of either catfish offal oil or refined (RF) menhaden oil. At harvest, fillets were saved for sensory evaluation and fatty acid analysis. Results showed no significant (P>0.05) differences among treatments for aquarium study and pond study variables such as weight gain, fillet proximate analysis, or pond production. GC analysis showed that levels of omega-3 (n-3) highly unsaturated fatty acids (HUFA) in fillet lipid were significantly (P<0.05) elevated for fish fed menhaden oil diets. Sensory evaluation revealed that fillets from fish fed RF menhaden oil had satisfactory flavor and could be a source of n-3 HUFA for humans..