Recent advances in lipid nutrition in fish larvae.

摘要: Due to the importance of dietary lipid utilization for larval rearing success, increasing attention has been paid during last years different aspects nutrition such as digestion, absorption, transport and metabolism, which are frequently studied by research groups. The present study reviews published information on these aspects, including some recent results obtained in our laboratory, that contribute a better understanding nutrition. Neutral lipase activity was found digesta gilthead seabream early first feeding, followed significant increase reached up 8 times initial levels at day 15 clearly influenced fatty acid composition lipids. Accordingly, capacity absorption intestinal epithelium also observed onset exogenous although specific location digestive tract segments differ with species. Whereas absorb increases development live prey-fed larvae, this improvemment is delayed larvae fed formulated diet. Increasing phosphatidyl cholines enhanced regardless whether it soybean or marine origin, but latter improved hepatic utilization. Enzymatic, histological biochemical evidences suggest fish able effectively digest n-3 HUFA-rich triacylglycerols, feeding phosphoacylglycerols, particularly if they rich HUFA, would enhance phosphoacylglycerols digestion specially alowing HUFA incorporation into membrane lipids promoting growth. Although essentiality extensively, only recently arachidonic few species recognised. Evidences competitive interactions among essential acids besides minimum requirement each acid, their relative ratios must be considered.