EFFECT OF ADDING PHOTOPROTECTIVE COMPOUNDS IN THE DIET OF Pleoticus muelleri

DIAZ A.C.; ARZOZ N.; MARCOVAL M.A; ESPINO L.; VELURTAS S.; FENUCCI JORGE L

Lima

Congreso; LAQUA16; 2016

World Aquaculture Society

Pleoticus muelleri is a species of commercial interest distributed in the Southwestern region of the Atlantic Ocean from Southern Brazil to Patagonia (23-50 °S). During the past two decades, it has shown an increase in ultraviolet radiation (UVR) and particularly the UVB (280-315nm) above Earth´s surface. While penaeoid shrimps are coastal species that inhabit generally at depths greater than 10 m, under cutivation conditions are kept in ponds at 2 meters deep, so they are exposed to extreme environmental conditions. It has been shown that many species of macroalgae synthesize and accumulate high concentrations of photoprotective compounds and may constitute an interesting alternative as a supplement in aquaculture feeds. The aim of this study was to determine the bioaccumulation of photoprotective compounds from a diet added with red seaweeds meal on juvenile P.muelleri and its possible protective effects under conditions of stress by ultraviolet radiation Juveniles of P. muelleri approximately 5g, were obtained from a commercial fisherman from the coastal waters of Mar del Plata, Argentina (38°S 57º 33?W). Previous to the experiment with radiation, the animals were placed in 2 PVC tanks under controlled conditions of temperature, pH, salinity and photosynthetically active radiation (PAR) under two feeding treatments. One group fed with basal diet (B) (45% protein, 8% lipid, 7% water and 7% ash) and the other 1% diet added with red seaweed meal of the family Halymeneaceae (D1). After 20 days animals were subjected to three radiation treatments, by triplicate: a) Control PAR (400-700nm) and diet B b) PAR+ UVR (280-700nm) and diet B and c) PAR+ UVR (280-700nm) and diet D1. Survival, percentage of weight gain, concentrations of carotenoids and photoprotective compounds (PC) were determined. In treatment B mortality of 23% was recorded after 72 hours of exposition to UVR, while in those fed with the added diet mortality was observed after 120 h of exposure. Survival in control treatment was 100%. At the end of the exposure period percentage of weight gain was higher in animals fed diet D1 and the concentration of PC was significantly higher in animals fed with diet D1 (p