Based on the foods they eat and their age, certain types of fish may be more susceptible to mercury and other contaminants. The Food and Drug Administration (FDA) and the Environmental Protection ...

Fish that are predatory, i.e., eat other fish, are more likely to have higher mercury levels. This includes tuna, mackerel, and swordfish, however, feeding small amounts of these fish infrequently ...

They can swim fast and are very good at hunting other fish. A pike is a freshwater fish that lives in lakes and rivers. Pike mainly hunt fish and frogs but will sometimes eat small mammals and birds.