Correlations Between Pre- and Post-Fasting Growth in Nile Tilapia
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Data
2008-12-01
Autores
Barreto, Rodrigo Egydio [UNESP]
de Miranda Cabral Gontijo, Alisson Marques
Delicio, Helton Carlos [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Garuda Scientific Publications
Resumo
We tested the correlation between growth rate before and after a food deprivation phase in twelve single held Nile tilapias, Oreochromis niloticus. The experiment was divided into three phases: before food deprivation (phase 1: 15 d), food deprivation (phase 2: 12 d) and refeeding (phase 3: 15 d). The specific growth rate - SGR, food conversion efficiency - FCE and feed ingestion increased significantly during phase 3. Positive and significant correlations were found either to SGR or to feed ingestion between Phase 1 and 3 but not for FCE. The SGR on phase 3, moreover, were positively correlated to FCE and feed ingestion, while on phase 1 SGR was positively correlated to FCE only. Thus, high pre-fasting SGR or feed ingestion reflects in likewise high post-fasting SGR or feed ingestion values. Moreover, since SGR and FCE are correlated to each other in both phase 1 and 3, but phase 3 SGR is also correlated to feed ingestion; we could suppose that hyperphagic behaviour could be the main compensatory mechanism. Accordingly, we suggest that a fish with an elevated growth performance shall display a proportionally raised post-fasting growth response in order to normalize its predetermined growth trajectory and resume its normal growth rate.
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Growth, food deprivation, fish, Nile tilapia, Oreochromis niloticus
Como citar
Journal of Applied Animal Research. Izatnagar: Garuda Scientific Publications, v. 34, n. 2, p. 113-116, 2008.