Abstract

RIANO, F. Y; LANDINES, M. A  and  DIAZ, G. J. EFFECT OF FOOD DEPRIVATION AND RE-FEEDING ON MUSCLE WHITE COMPOSITION OF Piaractus brachypomus. Rev. Med. Vet. Zoot. [online]. 2011, vol.58, n.2, pp.84-98. ISSN 0120-2952.

In order to evaluate the effect of food deprivation and re-feeding on the composition of cachama blanca white muscle, two restriction food protocols were used per 84 days, each one divided in a food restriction period and re-feeding period. In the first of them, it was used a moderate food restriction (33.3%) and in the second one, was a severe restriction (50%); both groups were compared with a control group receiving the samefood ration under commercial culture conditions. At the end of the trial, any of the times of food restriction had significant effects (p>0.05) on fillet protein percentage. However, significant differences (p<0.05) were observed on lipids, ash and energy percentages. In regards to muscle ash percentage, it was observed that food restriction tends to increase its value, and in contrast, was observed an opposite effect on lipids percentage and energy levels. However, when individuals completed the re-feeding period, a restoration in the levels of nutrients compared to non-restricted individuals was observed. As for the fatty acid profile, the control group showed with significant differences (p < 0,05) the highest percentage of omega-3 (n-3). These results suggest that restriction protocols applied in Piaractus brachypomus stimulated mobilization of nutrients muscle and its later restore without affecting the integrity of the white muscle.

Keywords : Piaractus brachypomus; Fish feeding; starvation; re-feeding.

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