Which type of fish should be avoided to limit methylmercury exposure?

Shark is the type of fish that should be avoided to limit methylmercury exposure due to its high levels of this toxic substance. Methylmercury accumulates in the aquatic food chain, and larger fish, such as shark, consume smaller fish that contain mercury, leading to increased concentrations in their bodies. As a result, shark is often cited as a fish with the highest mercury content, posing potentially serious health risks, especially for pregnant women, nursing mothers, and young children, who are more vulnerable to the neurotoxic effects of methylmercury.

In contrast, options like salmon, catfish, and tilapia are known to have lower levels of mercury, making them safer choices for consumption. These fish are often farmed or caught in environments that do not accumulate significant mercury levels, thus presenting less risk to health compared to shark. This is why limiting or avoiding shark is particularly emphasized for individuals concerned about mercury exposure.