Inositol is a water-soluble growth factor for which no coenzyme function is known. Inositol, sometimes called myo-inositol, is a sugar alcohol that is apparently not required in the diet of most animals but is required for shrimp. The function of inositol is as a component of the inositol phosphoglycerides and inositol phospholipids that are found in tissues, such as skeletal, heart and brain. Deficiency symptoms include slow growth and anorexia. Sources of inositol include fish meal, liver meals, wheat germ, and yeast. Recommended supplementation level of inositol in commercial feeds is 300 mg/kg (Akiyama et al., 1992).