Social interaction and brain serotonergic activity of rainbow trout (<italic>Oncorhynchus mykiss</italic>) in self‐feeding system.

The article presents information on the feeding procedure of fishes through self-feeding and enhancement of the learning ability of the fishes including tilapia, and rainbow trouts. Topics include the different categories of animal personality development, the dominance of the glycoprotein ependymin in cerebrospinal fluid, and fish growth.