Mercury and fish consumption

It suggests that women who might become pregnant, women who are pregnant or are breastfeeding and young children should not eat more than one small portion (less than 100 g) per week of large predatory fish, such as swordfish, shark, marlin and pike. 
If they do eat a portion of this fish, they should not eat any other fish during the same week. 
Nor should they eat tuna more than twice per week.

What more can we do? 
The largest source of mercury emissions into the environment is from coal combustion. Join with your neighbors to reduce fossil-fuel based energy consumption by moving to clean energy generation and consumption. 

Portugal has one of the highest seafood consumption per capita in the world.
But there is no advice from Portuguese authorities.
Could be important to diversify the fish, at least.
...and maybe to reduce the seafood consumption!?
Maybe...given the fact that we live in a world growing population and a limited resources planet.