Application of the Taguchi's loss function in the breeding of Nile tilapiafed with different levels of alcohol yeast

Studies were conducted to evaluate the effect of 10%, 20% and 30% ration su bstitutions for distillery yeast on the function Taguchi's loss using two h undred and forty 45-day-old fingerlings of Nile tilapia (Oreochromis niloti cus), sexually reverted with an initial average weight of 1.25 +/- 0.14 g p laced in amianthus box.. The average results obtained for the limnological parameters of the water quality control through chemical analysis were cons idered normal. Taguchi's losses for the total production, for the dead and discarded fishes did not show correlation for the different levels of alcoh ol yeast inclusion, showing that the choice of the yeast level in the ratio n for these fishes depended on its availability and occasional cost. It was observed that the losses, specially those in the amianthus boxes, could be attributed to the density limitation, absence of natural feeding and great dispersion in the fishe size.