Effects of Prolonged Fasting and Refeeding on Metabolic, Physiological, Tissue, and Growth Performance Adjustments in <i>Colossoma macropomum</i>
Lívia de A. Porto,
Yhago P. A. S. Assis,
Matheus P. S. Amorim,
Paulo E. C. M. de Oliveira,
Alessandro L. Paschoalini,
Nilo Bazzoli,
Ronald K. Luz,
Gisele C. Favero
Affiliations
Lívia de A. Porto
Laboratório de Aquacultura, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, no. 6627, Belo Horizonte 30161-970, MG, Brazil
Yhago P. A. S. Assis
Laboratório de Aquacultura, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, no. 6627, Belo Horizonte 30161-970, MG, Brazil
Matheus P. S. Amorim
Laboratório de Aquacultura, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, no. 6627, Belo Horizonte 30161-970, MG, Brazil
Paulo E. C. M. de Oliveira
Laboratório de Aquacultura, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, no. 6627, Belo Horizonte 30161-970, MG, Brazil
Alessandro L. Paschoalini
Programa de Pós-Graduação em Biologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Av. Dom José Gaspar, 500, Belo Horizonte 30535-610, MG, Brazil
Nilo Bazzoli
Programa de Pós-Graduação em Biologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Av. Dom José Gaspar, 500, Belo Horizonte 30535-610, MG, Brazil
Ronald K. Luz
Laboratório de Aquacultura, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, no. 6627, Belo Horizonte 30161-970, MG, Brazil
Gisele C. Favero
Laboratório de Aquacultura, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, no. 6627, Belo Horizonte 30161-970, MG, Brazil
Fish can tolerate prolonged periods of fasting more easily than endothermic organisms. However, these fasting periods are associated with pronounced lipid and protein catabolism and body weight loss. We evaluated the use of body reserves, growth performance, and the histology of the intestines and muscles of Colossoma macropomum subjected to prolonged fasting for 45 days and refeeding for 14 days. We used 66 juvenile C. macropomum (71.78 ± 10.75 g) distributed in 10 tanks of 100 L in a recirculating aquaculture system (RAS) and kept 6 fish in a separate tank, considered the basal group. The fish were divided into two groups: fed (continuously fed for 59 days) and fasted/refed (subjected to fasting for 45 days and subsequently refed for 14 days). The tambaqui juveniles showed the mobilization of their body reserves during 45 days of fasting but with a large deficit in their growth performance. The 14-day refeeding period was sufficient for fish to restore their energy but insufficient for recovering most growth parameters.
