DESEMPENHO PRODUTIVO DE TILÁPIAS EM VIVEIROS INTERMITENTEMENTE DRENADOS PARA IRRIGAÇÃO
2008
Celicina Maria da Silveira Borges Azevedo | Bruno Rodrigo Simão | Clautenes Almeida | Jackson Ferreira Silva | Marcelo Pinheiro Costa
The experiment was carried out to determine the effect of intermittently drain tilapia ponds for vegetable irrigation. A completely randomized design in a factorial arrangement 2X3, with three replications was used in this experiment. The first factor was kind of feed: feed 1 - without animal ingredients; feed 2 - with the inclusion of shrimp meal; and feed 3 - with the inclusion of fish meal. The second factor was pond drainage scheme, where in the scheme 1, ponds were intermittently drained for irrigation and subsequently refilled; and in the scheme 2, ponds were not drained. Sexually reversed Nile tilapia (Oreochromis niloticus) with average weight of 1.66 g were randomly stocked at the experimental ponds, with thirty five fish per tank, in a stock density of 1.25 fish per m2. Fish were fed two times a day in a proportion of 5% of body weight. There was a significant effect for tank drainage scheme for the variables feed conversion ratio and survival (P<0.05) where tilapias cultured on ponds intermittently drained for irrigation had higher survival and better feed conversion ratio. There was no significant effect (P>0.05) on the interaction between kind of feed and tank drainage scheme for any of the studied variables. Feed type and pond drainage scheme had no effect on weight gain (P>0.05). Therefore, it can conclude that intermittently drained fish ponds, for irrigation, results in the best tilapia's performance in terms of feed convertion and survival.
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