Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Universidade Estadual de Maringá
2013
|
| Soggetti: | |
| Accesso online: | https://www.redalyc.org/articulo.oa?id=187129138003 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
Sommario:
- High levels of total ammonia nitrogen as NH4+ are stressful and harmful to the growth of Nile tilapia juveniles Francisco Jackes Rodrigues da Silva Francisco Roberto Santos Lima Diego Alves do Vale Marcelo Vinícius do Carmo e Sá Biología Non fish culture water quality ionized ammonia This study determined whether high levels of total ammonia nitrogen (TAN) as NH4+ are harmful to the growth performance of Nile tilapia juveniles. Fingerlings (0.31 ± 0.04 g) were assigned to 30 polyethylene 100-L tanks in a roofed room for 12 rearing weeks. There were increasing levels of TAN by increased NH4Cl application rates (0.0; 0.25 and 0.50 g tank-1 week-1) at three conditions of water pH (acidic, 6.2 ± 0.5; neutral, 7.2 ± 0.8 and alkaline, 8.8 ± 0.3). The application of HCl to acidic tanks caused 100% of TAN to be converted into NH4+. The poorest growth performance results were observed for the alkaline tanks subjected to the highest application of NH4Cl. In acidic tanks, fish survival has dropped in those tanks under the highest application rate of NH4Cl. Tilapia growth was lower in neutral tanks when the NH4Cl application rate increased to 0.50 g tank-1 week-1. It was concluded that waterborne ionized ammonia (NH4+) is indirectly toxic to tilapia due to the harmful metabolites derived from it, such as nitrite and chloramines as well as due to water acidification. 2013 artículo científico 1679-9283 https://www.redalyc.org/articulo.oa?id=187129138003 en http://www.redalyc.org/revista.oa?id=1871 Acta Scientiarum. Biological Sciences application/pdf Universidade Estadual de Maringá Acta Scientiarum. Biological Sciences (Brasil) Num.4 Vol.35