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| Format: | Artículo científico |
| Language: | es |
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Universidade Estadual de Maringá
2015
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| Online Access: | https://www.redalyc.org/articulo.oa?id=303141017003 |
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Table of Contents:
- Tolerance of Nile tilapia juveniles to highly acidic rearing water Vanessa Tomaz Rebouças Francisco Roberto dos Santos Lima Davi de Holanda Cavalcante Marcelo Vinícius do Carmo e Sá Agrociencias pH ammonia Aquaculture acidophilic fish Oreochromis niloticus The present work aimed at determining the tolerance of Nile tilapia juveniles to highly acidic rearing waters and the effects of water acidity on the quality of tank effluents. The experimental design consisted of four treatments with different water pH values (4.12 ± 0.84; 5.13 ± 0.74; 6.14 ± 0.64 and 8.06 ± 0.48), with five replic ates each. No exchange of water wa s performed throughout the study, only water replenishment to maintain the initial level. Variables of water quality, soil, growth performance, metabolism and effluents were monitored for eigh t weeks. Despite the lower total ammonia nitrogen (TAN) concentration in the pH 8 tanks, their levels of non-ionized ammonia (NH 3 ) were the highest ones. At the end, the lowest body weight of fish wa s observed in the pH 8 tanks. There was a significant improvement in feed conversion ratio (FCR) and protein efficiency ratio (PER) due to to water acidification. There were reduced concentrations of NH 3 in the acidified tanks’ effluents. It was concluded that the gradual water acidification up to pH 4 can improve the Nile tilapia juveniles’ growth performance. 2015 artículo científico 1806-2636 https://www.redalyc.org/articulo.oa?id=303141017003 es http://www.redalyc.org/revista.oa?id=3031 Acta Scientiarum. Animal Sciences application/pdf Universidade Estadual de Maringá Acta Scientiarum. Animal Sciences (Brasil) Num.3 Vol.37