OPTIMUM SELENIUM, MANGANESE AND COPPER LEVELS IN DIETS HIGH IN PLANT BASED FEEDSTUFFS FOR GILTHEAD SEABREAM (Sparus aurata) FINGERLINGS
CCMAR SEMINARS
16 de maio, 13h30 | Anf. C (CP)
OPTIMUM SELENIUM, MANGANESE AND COPPER LEVELS IN DIETS HIGH IN PLANT BASED FEEDSTUFFS FOR GILTHEAD SEABREAM (Sparus aurata) FINGERLINGS
David Domínguez
(IU ECOAQUA, University of Las Palmas de Gran Canaria)
Substitution of fishmeal and oil by plant sources alters selenium (Se), manganese (Mn) and copper (Cu) levels in feeds. These minerals prevent oxidative damage and can be potential toxicants at high levels. Gilthead seabream (GSB) is of major interest for Mediterranean aquaculture, however the requirements for Se, Mn and Cu are not determined. This study aimed to determine the effects of dietary Se, Mn and Cu levels in low FM-FO diets for GSB.
Three trials were conducted using a common plant-based diet. 5 diets per trial were supplemented with Se, Mn or Cu. GSB were distributed into 15 tanks per trial, and growth and samples were taken at the end of the trial.
In trial 1, increase in dietary Se improved growth and lipid deposition in fish and reduced the expression of glutathione reductase (gr). However further elevation of Se negatively affected several parameters suggesting a potential selenosis. Dietary Mn did not affect fish growth or survival, but raised body lipid contents and increased expression of several genes. Finally, in trial 3, body weight was not affected by dietary Cu, suggesting that the basal Cu levels were enough to cover Cu requirements in GSB.
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