than the control, at 6.55-14.37 and 4.34-11.65 g/100 g fresh shrimp, respectively. However, shrimps treated with glutamic acid, phenylalanine, methionine, isoleucine and threonine were not well accepted because of the shrinkage (glutamic acid treated) and the comments on their bitter and astringent taste. Consequently, glycine, proline, lysine, and arginine were chosen for further studies.