Dietary phosphorus supplementation in cellular-boned fish species diets

Poster.-- Aquaculture Europe 2021, Funchal, Madeira, 4-7 OctoberPhosphorus is an essential nutrient for skeletal physiology, ionic homeostasis, and energy metabolism in fish. Unlike other minerals, the phosphorus content in water is insufficient to meet fish requirements and therefore the diet is the main external source of phosphorus. In aquaculture, commercial diets commonly have higher phosphorus concentration than the basal requirements in most fish species to ensure growth and prevent skeletal disorders. This practice poses a serious environmental problem as excess phosphorus in water from non-eaten food and urinary/fecal excretions produces eutrophication of aquatic ecosystems. Our previous studies with acellular-boned fish (Suarez-Bregua et al., 2021) revealed that a lower phosphorous concentration diet is possible without affecting the fish health and growth. In this study, we wondered if this is also applicable to cellular-boned fish species. Thus, the objective of this study was to analyze the effect of dietary phosphorus concentrations (low, standard, and high phosphorus diets) on bone mineralization of zebrafish (Danio rerio), a popular model organism and a cellular-boned teleost speciesThis work was funded by the Spanish Economy and Competitiveness Ministry projects AGL014-52473R and AGL2017-89648P to J. Rotllant. L. Guerrero-Peña was supported by pre-doctoral fellowship of the Spanish Personnel Research Training Program funded by Spanish Economy and Competitiveness Ministry (PRE2018-085475). L. Méndez-Martínez, was supported by pre-doctoral fellowship of the Xunta de Galicia (IN606A-2020/006)N