Eating fish will make you smart. Protein in fish is extremely rich, which can promote brain development, enhance the excitation and inhibition function of cerebral cortex, and improve learning efficiency. So in this sense, eating fish will make people smart. There are about 32,000 kinds of fish in the world. Fish live in water, distributed in the ocean and fresh water, of which two thirds live in the ocean and the rest live in fresh water. Fish are mostly cold-blooded animals, and very few are warm-blooded animals. They breathe through their gills and have jaws and fins.