Back in the 1950s, all school kids in England were given daily cod liver oil. Smart parents have known for a long time that seafood is good for young brains, and an overwhelming amount of research has been published over the last 10 years confirming the huge mental benefits of omeaga-3 fats.

According to a 4 year study by Canada’s Dalhouise University, however, our chances of readily having this brain food available to us will be annihilated by 2048 due to severe pollution.
Boris Worm notes:

If the long-term trend continues, all fish and seafood species are projected to collapse within my lifetime- by 2048. I was shocked and disturbed by how consistent these trends are- beyond anything we expected.

Apparently, nearly 1/3 of fish stocks are already in collapse.