The requirements for vitamins, minerals and trace elements in fish vary not only with different periods of growth and physiological functions, but also with nutrition, especially in the breeding phase, in periods of stress, adverse weather conditions and in states of disease.
Vitamin A: Enters into the oxidation & reduction reactions, in special the metabolism of carbohydrate  & lipids, as well as it also stimulates the Epithelia.
Vitamin D3: Plays a role in Calcium & phosphor metabolism and their precipitation in the bones, helps both calcium & phosphor absorption in the intestine, and stimulates parathyroid Hormone.
Vitamin E: Regulates oxidation-reduction reactions & protein metabolism, it stimulates the urogenital tract.
Vitamin C: Plays a basic role in antibody synthesis, and it is essential in hemopoiesis.
Mineral Elements: Are very useful in building body tissues, metabolism, and various stages of growth. They are important in all stages of growth.
BHT is a general-purpose antioxidant with a wide range of uses.