<b>Small crumbled diet versus powdered diet in restricted feeding management of juvenile Nile tilapia</b> - doi: 10.4025/actascianimsci.v35i2.16767

Resumo

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.