Levels of lead and other heavy metals spiked in L.A.’s coastal waters after the January fires, raising serious concerns for ...

The diagram shows how mercury can accumulate in the food chain. In the sea, tiny animals and plants called plankton absorb the mercury compounds. When the plankton are eaten by small fish ...

National Geographic has retired its Seafood Decision Guide ... including those smaller and lower on the food chain, because they can reproduce quickly to sustain their populations.