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Print version ISSN 0001-3765On-line version ISSN 1678-2690


MATTOS, BRUNO O. DE et al. A new approach to feed frequency studies and protein intake regulation in juvenile pirarucu. An. Acad. Bras. Ciênc. [online]. 2017, vol.89, n.2, pp.1243-1250.  Epub Apr 27, 2017. ISSN 0001-3765.

This study aimed to investigate pirarucu's (Arapaima gigas) ability to trigger a self-feeding system to regulate protein intake between two standard diets that contained 39% and 49% of crude protein. The same system allowed the evaluation of daily feeding and locomotor activity rhythms. Eighteen fish (654.44±26.85g) were distributed into six 250 L tanks (3 fish/tank). Fish had free access to both diets (39% vs. 49% protein) by feeders (2 per tank), adapted to be activated by fish themselves. This system was connected to a computer system. After an adaptation period, fish learned to activate feeders and the mean food intake recorded was 2.14% of their body weight on a daily basis. Fish showed feeding (72.48%) and locomotor (72.49%) activity predominantly during the daytime, and daily variations of choice between diets, but fixed a protein intake feeding target at 44.53%. These results should be considered when discussing feeding behavior, feeding schedules and diet intake regulations.

Keywords : Arapaima gigas; feeding behavior; protein intake; self-feeding.

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