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The Ability of Nile Tilapia to Regulate Protein and Energy Intake Evaluated by carbon Relative Enrichment （δ^13C）

Journal of Agricultural Science and Technology(B) 2013年第1期3卷 45-55页

作者： André Moreira Bordinhon Luiz Edivaldo Pezzato Carlos Ducatti Juliana Céia Denadai Margarida Maria Barros Agriculture and Environment Institute Universidade Federal do Amazonas Humaittá Amazonas 69800-000 Brazil Aquatic Organisms Nutrition Laboratory (Aquanutri) College of Veterinary Medicine and Animal Science Sǎo Paulo StateUniversity Botucatu Sǎo Paulo 18610-307 Brasil Environmental stable lsotopes Center Biosciences Institute Sao Paulo State University Botucatu Sao Paulo 18610-307 Brasil

The aim of this study was to assess the ability of Nile tilapia to balance its own diet, when two ingredient mixes were offered, using carbon stable isotopes. In order to accomplish that, 225 Nile tilapia juveniles （average initial weight 5.0 g ± 0.5 g） were distributed in five tanks, each containing a group of 45 fish. One group of fish were fed exclusively with a high protein mix （HPM; δ^13C = -22.62‰）, the second one fed only with a low protein mix （LPM; δ^13C = -14.34‰）. The other groups had free access to both mixes （free choice system）. The fish from all tanks were fed four times a day. Muscle, liver and blood samples were collected at each five days （from 2 fish/tank/collection） for 86 days, except for the fish fed with LPM （fed for a 120 days period）. The samples were analyzed in a mass spectrometer and proportions of the mixes consumed were estimated through its carbon isotope enrichment （δ^13C）. Energy intake slightly decreased after the 50th day and protein consumption increased after the same period. However, consumption did not present a clear pattern in relation to the individual weight, i.e., protein consumption patterns are mainly related to the age of the individuals and it is not clear if it is also correlated to their weight. Additionally, this technique allowed the observation of differences regarding consumption among the individuals from the experimental group.

关键词： Protein intake energy intake diet self-selection carbon stable isotopes Nile tilapia.

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