Apparent lipid and fatty acid digestion, retention of lipid and growth performance in Caspian salmon (Salmo trutta caspius) fry fed dietary n-3 highly unsaturated fatty acids and vitamin E.

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Abstract

A 10-week feeding experiment was conducted to investigate the effect of dietary n-3 highly
unsaturated fatty acids (n-3 HUFA) and vitamin E interaction on growth, apparent digestibility,
apparent retention and utilization of lipid in Caspian salmon fry. Six experimental diets combining
three different dietary levels of n-3 HUFAs (L: low: 1+0.5, DHA+EPA, M: medium 2+1, DHA+EPA,
H: high 4+2 DHA +EPA g/100g diet) with two different levels of vitamin E (L: low 300 and H: high
1000 mg/kg diet): LL, LH, ML, MH, HL and HH (HUFA/vitamin E) were investigated. Fry with
initial mean (±SD) body weight of 600 ± 25 (mg) were randomly distributed in tanks and fed to
apparent satiation. Increase in dietary HUFA and vitamin E markedly improved larval growth. The
results showed that the survival of Caspian salmon fry was not affected by dietary omega-3 HUFA and
vitamin E. C20:5n-3 and C22:6n-3 fatty acids content of polar and neutral lipids positively correlated
with their concentration on diets. Apparent digestibility and apparent retention of total lipid was
significantly affected by dietary HUFA. The results showed that n-3 highly unsaturated fatty acids and
vitamin E had positive effects on growth performance, lipid metabolism and apparent digestibility of
Caspian salmon fry.

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Iranian Scientific Fisheries Journal
Volume 22, Issue 3 - Serial Number 84
May and June 2013
Pages 74-90

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