¨ç Feed additives for hatchery fishes shows a clear effect by dosing only a small quantity since they are supplied through an oral administration method after being mixed with feed. ¨è Feed additives provides an increase effect to nutritive elements contained in the feed and does not develop tolerance and have side effects, such as a lowering of immunity in spite of a continuous administration or excessive administration. ¨é Especially, in case of fishes, which are stopped in growth at low temperature, the present invention can raise healthy hatchery fishes of excellent quality by reinforcing digestive power and continuing their growth. ¨ê The present invention can prevent and cure bacillary, viral, parasitic diseases causing a mass death in freshwater fish farms, and reinforce immunity and promote physiological activity.