Imbalances in the hardness/alkalinity ratio of water and Nile tilapia’s growth performance - doi: 10.4025/actascitechnol.v36i1.18995
| Autor: | Davi de Holanda Cavalcante, Nayara Nunes Caldini, Jéssica Lucinda Saldanha da Silva, Francisco Roberto dos Santos Lima, Marcelo Vinícius do Carmo e Sá |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Acta Scientiarum: Technology, Vol 36, Iss 1, Pp 49-54 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1806-2563 1807-8664 87805146 |
| DOI: | 10.4025/actascitechnol.v36i1.18995 |
| Popis: | The present work determined the effects of water with unbalanced calcium hardness/total alkalinity (CH/TA) ratio on Nile tilapia growth performance. Two unbalanced CH/TA ratios were tested for 8 weeks using one indoor system with 30 circular polyethylene 100 L tanks and one outdoor system with 36 circular polyethylene 250 L tanks. The factors and their specific levels tested were the total alkalinity of water (TA; 50 and 100 mg L-1 CaCO3) and the CH/TA ratio of water (CH/TA; 1/2, 1/1 and 5/1). In the indoor system, the 5/1 CH/TA ratio tanks had higher total ammonia nitrogen (TAN) than the 1/2 or 1/1 CH/TA ratio tanks. In the outdoor system, higher concentrations of TAN were found in the 1/2 CH/TA ratio tanks. The soil of the 5/1 CH/TA ratio indoor tanks had higher concentrations of organic carbon than the 1/2 or 1/1 CH/TA ratio tanks. The detrimental effects of the 5/1 CH/TA ratio on fish growth performance were stronger than those associated with the 1/2 CH/TA ratio. A significantly better food conversion ratio was observed in the 1/1 CH/TA ratio outdoor tanks regardless of the TA level of the water. |
| Databáze: | Directory of Open Access Journals |
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