Fish Diseases and Management

6.1.3.1 Amino acid deficiencies

The most frequent indicator of an amino acid deficiency problem is impairment of growth. These deficiencies result in dorsal fin erosion, which has been associated with lysine deficiency, spinal deformities associated with tryptophan, leucine, lysine, arginine or histidine deficiency and a lenticular cataract associated with methionine and tryptophan deficiency have been reported.