Abstract
SUMMARY: To determine whether an increase in the quantity of lipids ingested by sea bass (Dicentrarchus labrax) broodstock could improve egg quality, three year-old sea bass were fed three different diets: a natural diet (Control group), and two artificial diets containing 10% or 17% of total lipids. In two consecutive reproductive seasons, the spawning results, the lipid classes and the fatty acid composition of the eggs were studied. No differences in the absolute content of lipids or in the percentage of different lipid classes were observed between the eggs from the three groups. Both experimental groups fed with the artificial diets produced eggs of poor quality, with low percentages of buoyancy and hatching. Those observed in the eggs from the Control Group were significantly higher (p>0.01) than those of the experimental groups. The higher hatching rate of the eggs from the Control Group was associated with higher DHA:EPA and AA:EPA ratios. The data obtained showed that the fatty acid composition of the eggs was affected by the fatty acid composition of the diets but not by the total quantity of lipids administered to the broodstock.
Highlights
Food quality is accepted as one of the most important factors in determining spawning performance and subsequent egg quality in fish
Studies carried out on rainbow trout, Oncorhynchus mykiss (Watanabe et al, 1984), red sea bream, Pagrus major (Watanabe et al, 1991), and gilthead sea bream, Sparus aurata (Zohar et al, 1995), demonstrated that ovarian and embryonic development were greatly affected by the fatty acid composition of the diet
Duplicate samples of 100 eggs from each spawning were stored in 10 volumes of chloroform/methanol (2:1 v/v) with 0.01% (w/v) butylated hydroxytoluene (BHT) at –70oC prior to extraction
Summary
Food quality is accepted as one of the most important factors in determining spawning performance and subsequent egg quality in fish. Studies carried out on rainbow trout, Oncorhynchus mykiss (Watanabe et al, 1984), red sea bream, Pagrus major (Watanabe et al, 1991), and gilthead sea bream, Sparus aurata (Zohar et al., 1995), demonstrated that ovarian and embryonic development were greatly affected by the fatty acid composition of the diet. All these experiments showed that it was necessary to provide an adequate quantity of n-3 fatty acids to prevent low hatching rates and poor larval survival. Additional work is needed to establish the most suitable ratio between these two fatty acids
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