@Nabuquduriuzhur, mercury is a threshold hazard. Your body can process and eliminate it at a certain rate. When you intake exceeds that, it begins to accumulate and cause problems. Up to that point, it isn’t a problem. Lead is the same way, except the threshold is much smaller - especially in children (because it is so similar to calcium). The larger the fish, the higher on the food chain, and the higher the concentration of mercury.
@Nabuquduriuzhur, mercury is a threshold hazard. Your body can process and eliminate it at a certain rate. When you intake exceeds that, it begins to accumulate and cause problems. Up to that point, it isn’t a problem. Lead is the same way, except the threshold is much smaller - especially in children (because it is so similar to calcium). The larger the fish, the higher on the food chain, and the higher the concentration of mercury.