I'm become smart of fish?myth or true

I love fish but not all people like to eat fish.Already in school teachers learned us to eat fish. Fish is good to eat it's healthy food that good for the brain.It's one source of protein,even omega 3 that good for the heart. So why not eat it!when it's healthy food.

 But did fish make us smart?. I think this myth is known to everybody.
I have a  classmate  (elementary grade) she was one of the best in the class. Her father is a fisherman she told us that they ate fish from breakfast to dinner almost everyday. They only have meat in the table if one of  family member  celebrate birthday or some special occasion. This situation is quite common in my home country.

We still don't know if fish make us clever. I don't think so!or I don't know what's the truth. Every individual is unique and smart in some different way. What do you think!!!