This paper deals with the effects of fat content in feeds on thegrowth of the black carp (Mylopharyngodon piceus) fingerlings. Feeds with ordinaryprotein, carbohydrate, vitamin and mineral salt contents were applied by the methodof fat gradient. The source of fat used was oil of blark-scrapper fish. The parbolicalcurve obtained from the study indicates that the suitable fat level in feeds should be3--8% and the optimum requirement was 6.5%. Two experiments were carried out atfingerling stage and their results were roughly similar. The fat content in feedsdirectly affacts the biochemical composition of fish muscle and liver.