Effects of broodstock dietary lipid on fatty acid compositions of eggs from sea bass (Dicentrarchus labrax)

Effect of dietary supplementation of fatty acids and vitamins on the breeding performance of the carp Catla catla

“…proper balance in the diet of both of these PUFA which are critical during organogenesis in embryos and larvae is required in the broodstock diet for optimum reproductive success of fish [5]. It is now known [4,7] that diets with an over high ratio of n-6/n-3 PUFA could exaggerate stress response in fish broodstock leading to cardiac pathologies.…”

“…Efficacies of two diets containing corn oil and fish oil for rainbow trout reared at 8°and 18°C were compared [10] and it was shown that a dietary n-3/n-6 ratio affects egg fatty acid composition. It was also pointed out [5] that in addition to maintaining a proper ratio of DHA/EPA in fish diets, the consideration of what constitutes a desirable EPA/ARA ratio should be of equal importance when considering the formulation of broodstock diets. Diet formulation containing DHA/EPA ratios greater than 1 and EPA/ARA ratios smaller than 3 as well as the exclusion of 18:2(n-6) rich vegetable oils were found to be beneficial in terms of larval quality and survival of sea bass [5].…”

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“…The sum of n-3 HUFA in PL of ovaries and testis, being 25.41% and 12.35%, respectively, in the Ayungin and 13.75% and 13.35%, respectively for African catfish and in tilapia, being 18.90% and 16.39%, respectively, were shown to be more than twice that found in the muscles of the same species in our previous studies (Suloma et al, 2008). This result emphasized the importance of dietary HUFA for the reproductive processes, which should be kept mind Bell et al (1997) who reported that HUFA levels in eggs and newly hatched larvae from eight species of marine teleost were several folds higher than in the normal body lipids of these fish. Because of the specific role of (n-3) HUFA, especially DHA, in maintaining the structural and functional integrity in cell membranes, especially in the neural cell, the relative percentage of this HUFA is expected to increase during the gonad development stage (Mourente et al, 1991).…”

“…Balance in the diet of both of n-3 and n-6 which are critical during organogenesis in embryos and larvae is required in the broodstock diet for optimum reproductive success of fish (Acharia et al, 2000;Bell et al, 1997;Nandi et al, 1999). Our results showed that n-3/n-6 ratios of all samples in PL and NL within a narrow range (0.44-1.80), with one exception in NL for African catfish ovary which had (9.23) value.…”

“…Our results showed that n-3/n-6 ratios of all samples in PL and NL within a narrow range (0.44-1.80), with one exception in NL for African catfish ovary which had (9.23) value. This suggests that a proper balance in the diet of both of these PUFA which are critical during organogenesis in embryos and larvae is required in the broodstock diet for optimum reproductive success of fish (Bell et al, 1997). Bell et al (1990) and Bromage (1995) reported that diets with an over high ratio of n-6/n-3 PUFA could exaggerate stress response in fish broodstock leading to cardiac pathologies.…”