| Título: |
Small crumbled diet versus powdered diet in restricted feeding management of juvenile Nile tilapia - doi: 10.4025/actascianimsci.v35i2.16767 Small crumbled diet versus powdered diet in restricted feeding management of juvenile Nile tilapia - doi: 10.4025/actascianimsci.v35i2.16767 |
| Autores: |
Lima, Francisco Roberto dos Santos; Universidade Federal do Ceará Akao, Michael Masaki Freitas; Universidade Federal do Ceará Oliveira-Segundo, José Nacélio; Universidade Federal do Ceará Sá, Marcelo Vinícius do Carmo e; Universidade Federal do Ceará |
| Fecha: | 2013-03-27 |
| Publicador: | Editora da Universidade Estadual de Maringá |
| Fuente: |
Ver documento |
| Tipo: |
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| Tema: |
unpelleted diet; crumble; particle size; restricted feeding; water quality; Oreochromis niloticus Unpelleted diet; Crumble; Particle size; Restricted feeding; Water quality; Oreochromis niloticus |
| Descripción: |
The pellet size of the diet can affect both fish growth performance and the water quality of the rearing units. The present work assessed the effects of feeding juvenile Nile tilapia, Oreochromis niloticus (L.) a small crumbled diet (SCD; 0.8 mm) on water quality and growth performance. Fish were reared for six weeks in twenty 250-L polyethylene outdoor tanks at a density of 10 juveniles tank-1 (40 fish m-3). There were two feeding rates (standard and restricted) and two types of artificial fish diet (powdered and SCD). The standard feeding rates were reduced by 30% for restricted feeding. The concentrations of free CO2, reactive phosphorus, total ammonia nitrogen (TAN) and nitrite were higher in the full-fed tanks relative to the restricted-fed tanks. In the standard feeding rate groups, those tanks fed SCD had lower TAN and nitrite concentrations than tanks fed a powdered diet. The final body weight and specific growth rate of fish fed a restricted SCD were higher than the full-fed tanks. The higher levels of food waste in the powdered-diet tanks lead to impairment of fish growth performance. The pellet size of the diet can affect both fish growth performance and the water quality of therearing units. The present work assessed the effects of feeding juvenile Nile tilapia, Oreochromis niloticus (L.) asmall crumbled diet (SCD; 0.8 mm) on water quality and growth performance. Fish were reared for six weeks intwenty 250-L polyethylene outdoor tanks at a density of 10 juveniles tank-1 (40 fish m-3). There were two feedingrates (standard and restricted) and two types of artificial fish diet (powdered and SCD). The standard feedingrates were reduced by 30% for restricted feeding. The concentrations of free CO2, reactive phosphorus, totalammonia nitrogen (TAN) and nitrite were higher in the full-fed tanks relative to the restricted-fed tanks. In thestandard feeding rate groups, those tanks fed SCD had lower TAN and nitrite concentrations than tanks fed apowdered diet. The final body weight and specific growth rate of fish fed a restricted SCD were higher than thefull-fed tanks. The higher levels of food waste in the powdered-diet tanks lead to impairment of fish growthperformance. |
| Idioma: | Inglés |