EXTRACTS OF BROWN SEAWEEDS Undaria pinnatifida AND Macrocystis pyrifera AS DIETARY ADDITIVE AND ITS EFFECTS ON THE APPARENT DIGESTIBILITY AND METABOLIC PROFILE OF Artemesia longinaris

ESPINO, M.LAURA; ARZOZ, NATALIA SOLEDAD; DÍAZ, A.C.; VELURTAS, S.M.; MARCOVAL, M.ALEJANDRA; FENUCCI, JORGE. L

MEDICINA (BUENOS AIRES)

MEDICINA (BUENOS AIRES)

Lugar: Buenos Aires; Año: 2017 vol. 77 p. 1 - 616

0025-7680

The aim of this study was to determine effects of addition diet with polysaccharide extracts of brown seaweeds Undaria pinnatifida and Macrocystis pyrifera on zootechnical parameters, metabolic profile and apparent digestibility on Artemesia longinaris.A feeding trial was performed for 4 weeks. Prawns (5.94±1.30g) were fed diets with addition 0.5% of an inert marker Cr2O3, and with 1 or 2g of polysaccharide extracts of U. pinnatifida or M. pyrifera (U1, U2, M1 and M2, respectively) and without extract as control (C). To determine apparent digestibility, feces were collected during the last two weeks of the trial, and to measure metabolic variables, hemolymph was extracted at the end of the experiment. After 30 days of feeding in all treatments, the survival was superior to that considered as acceptable in commercial culture, percentages varied between 60% and 79.2% and no significant differences were found between treatments. Percentage of increment in mean weight of prawns under different treatments varied between 8.5 and 16.7%, with higher values in animals fed with U. pinnatifida extract (U1 and U2). Apparent digestibility decreases significantly with the addition of 2g of both extracts, although this effect was lower in those animals feed U1 and U2. Regarding the determination of metabolites, no significant differences were found in levels of plasma metabolites in animals feed with M. pyrifera but a significant increase was observed in total protein and cholesterol concentrations in animals feed with diet supplemented with 1g of U. pinnatifida.These results suggest that, the use of polysaccharide extracts of U. pinnatifida is feasible as additive in diets for the prawn A. longinaris. The optimal level of inclusion may vary depending on the algal species, for the cultivation of this species, the recommended concentration should be 1g, since it is the one that produces increase in mean weight, without interfering with apparent digestibility