THE POTENTIAL OF LIPOSOMES AS A NUTRIENT SUPPLEMENT IN FIRST-FEEDING MARINE FISH LARVAE
W. Koven, Y. Barr, E. Hadas, I. Ben-Atia, Y. Chen, R. Weiss, A. Tandler-1999

Aquaculture Nutrition, 5: 251-256

Abstract:

The ingestion rate (ng liposome/larva/h) of extruded [1-14C] palmitic acid-labelled liposomes containing physiological saline (PHS) or cod fish extract (CFE), was tested in 5-day-old gilthead seabream Sparus aurata and white grouper Epinephelus aeneus larvae. A follow-up study compared the assimilation of radioactive free fatty acid (FFA) label of these two liposome treatments into six phospholipid and neutral lipid fractions as well as the nonlipid fraction in 5-day-old seabream. In seabream larvae, there was a 50-fold (P < 0.05) increase in the net consumption rate when fed CFE liposomes (2305.8 ng liposome/larva/h) compared with liposomes containing physiological saline (42.7 ng liposome/larva/h). A similarly significant (P < 0.05) but less marked pattern was also observed in the grouper larvae where the CFE treatment larvae ingested 238.5 ng liposome/larva/h compared with 54.3 ng liposome/larva/h in larvae fed the PHS liposomes. In seabream larvae ingesting CFE and PHS liposomes, radioactivity was found in all larval fractions analysed. However, marked treatment differences (P > 0.05) in assimilation were found only in the triacylglycerol fraction (3.4 and 0.6 dpm/larva/h, respectively) and nonlipid fraction (11.2 and 15 dpm/larva/h, respectively).

(The National Centre for Mariculture, Israel Oceanographic and Limnological Research, Eilat, Israel)

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