Abstract

RODRIGUEZ, Liliana  and  LANDINES-PARRA, Miguel A.. Productive and Physiological Performance of Juveniles of Piaractus brachypomus Subjected to Food Restriction. Orinoquia [online]. 2018, vol.22, n.1, pp.57-67. ISSN 0121-3709.  https://doi.org/10.22579/20112629.480.

177 juveniles of Piaractus brachypomus were kept during 84 days in two ponds. Each group was assigned one of the following treatments: T1: fed every day, and T2: fed every other day. Blood samples from 7 animals of each treatment were taken on days 1, 28, 42, 56, 70, and 84 to determine hematocrit, hemoglobin, glucose, lactate, protein, triglycerides, cholesterol, cortisol, and insulin. Fish were weighted, measured, and sacrificed to remove the liver, viscera, and visceral fat to calculate the hepatosomatic index (HSI), viscerosomatic index (VSI), and visceral fat index (VFI). At the end of the trial, the group of sampled animals were filleted to do the energy and proximal analysis. There were significant differences in hematocrit between treatments, on days 56 and 84, they were higher in T1 on day 56, and lower in T1 on day 84. On days 1 and 42, hemoglobin was higher in T1, there were no significant differences among treatments. There were significant differences in glucose, insulin and lactate on day 28; the first two were higher in T1, while lactate was higher in T2. Protein significantly increased in T1 on day 42, and was the same on day 56, then decreased on day 70, and remained stable until day 84. There were no significant differences between treatments in triglycerides, cholesterol, and cortisol during any of the sample times. There were significant differences in the weight on days 42 and 70, and in length on day 42, but there were no significant differences between treatments at the end of the test. There were significant differences in IHS and IVS on day 84, they were higher in T1. There were no differences in IGV. Survival was 100% in both treatments. There were no differences in energy and proximal analysis of the fillets between the treatments. We can conclude that a 50% food restriction in the alternated scheme did not affect the physiological condition of the animals because there was not any significant metabolic damage or changes in the composition of the final product.

Keywords : Piaractus brachypomus; refeeding; fasting; compensatory growth.

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