Use of fruits waste in diets for piava

Abstract

The piava (Leporinus obtusidens) is an omnivorous native fish of southeastern and southern Brazil and has great potential for national fish farming. In this study, growth, digestive enzyme activity and body composition of piavas fed diets containing fruit waste: grape, orange, guava and fig were evaluated. They were used 180 fish (initial weight = 9.53 ± 1.82 g), fed 45 days, twice a day (5% BW). There was not difference between fruit wastes evaluated in the diet on growth parameters. Lipase activity was higher (p = 0.0001) in fish fed diets containing grape in 5.52%, 24.41% and 47.25% than in fish fed with fig, guava and orange, respectively. Trypsin activity was 28.88% lower (p = 0.02) in fish fed with diet containing orange waste than fed with grape waste. Chymotrypsin and plasma glucose did not differ between fish fed with diets containing different fruit wastes. No differences were observed in body fat and crude protein of fish fed the different diets. The fruit wastes evaluated may be alternative ingredients in diets for piava juveniles