White hybrid tilapia (Oreochromis) produced in an experiment that determined the effects of various management practices on growth rate and feed conversion ratios were weighed, measured, and filleted at the conclusion of the growth trials. Regression analyses produced two models to predict fillet yields-one model that used the fish weight and length and a reduced model that used only fish weight. While the full model produced a somewhat smaller error, it was found to be impractical to use fish length to estimate fillet yield due to the difficulty in obtaining a length measurement. The full model also produced unreasonable estimates when extended beyond the limits of the data set. Using a paired t-test, fillet yields of males and females of equal weights were tested and were not found to be significantly different. This model provides a means of converting market price of tilapia fillets to a price for live fish, once processing costs are considered.