Effects of the inclusion of polysacharides seaweed Macrocystis pyrifera extract in the diet of shrimp Artemesia longinaris.

FENUCCI, J.L.; ARZOZ, N.S.; ESPINO, M.L.; VELURTAS, S.M.; DÍAZ, A.C.

New Orleans

Congreso; Aquaculture America; 2015

wORLD AQUACULTURE SOCIETY

Culture of penaeid shrimp it is important due to the value of these species at international markets. One of the challenges of aquaculture is to maximize the benefits of production through the development of adequate feeds to meet nutritional requirements of the cultured species. Food represents up to 50% of operating costs in the semi-intensive and intensive shrimp farms. Artemesia longinaris has a distribution along the South American coastal waters from 23° S to 43° S and is one of the most valuable species in the Argentine markets. The aim of this study was to determine the effects of addition of polysaccharide extracts from the seaweed Macrocystis pyrifera in the diet of Artemesia longinaris. An experiment was conducted for 25 days; with animals of aprox. 6 g, all the individuals were placed in glass aquaria with continuous aeration. Every day shrimps were fed with 10% of the biomass, monitoring and removing molts, feces and dead animals. Three isoproteic and isolipidic diets were tested (45% proteins, 7% lipids). The mean protein sources were fish and soybean meals; manioc starch was used as binder. Basis on a standard feed (C1), two other diets were designed by supplementing with 1g (D2) and 2g (D3) of polysaccharides seaweed extract. Formulated feeds were tested in four replicated groups of six prawns randomly chosen. Upon completion of the experiment survival, growth and plasma metabolites were determined. Individuals fed with diets D2 and D3 showed greater increase in weight and daily weight gain than individuals fed with the control diet C1. Regarding the determination of metabolites in plasma and survival, no significant differences among treatments were found (P