CCMAR SEMINARS

16th of May, 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)

Abstract

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.
        

Short CV

David Dominguez studied veterinary medicine at the University of Las Palmas de Gran Canaria and the Technical University of Lisbon. He later on focused on aquaculture research and conducted his master’s degree on aquaculture at the University of Las Palmas de Gran Canaria. He is currently undergoing his PhD in the Aquaculture Research Group of the University, ECOAQUA Intitute of Las Palmas de Gran Canaria under the supervision of prof. Marisol Izquierdo and prof. Lidia Robaina. He has been involved in several European projects focused on replacing fish meal and oil by alternative vegetable ingredients for the aquaculture industry, such as ARRAINA and PERFORMFISH, as well as other EU funded projects such as DIVERSIFY. In this area he is mainly studying the micronutrient requirements and sources for Mediterranean commercially valuable species, such as Gilthead seabream, at different life stages. His research focuses mainly on the effects of different micronutrients on bone health and mineral and vitamin retentions. During his years as PhD and masters student he has published several articles, participated with several oral presentations in a series of international symposiums and has conducted internships in laboratories in Italy and Norway.

Poster