Question: how do you get mercury poisoning from fish

title: Mercury in fish
text: The consumption of fish is by far the most significant source of ingestion - related mercury exposure in humans and animals . Mercury and methyl mercury are present in only very small concentrations in seawater . However , they are absorbed , usually as methyl mercury , by algae at the start of the food chain . This algae is then eaten by fish and other organisms higher in the food chain . Fish efficiently absorb methyl mercury , but excrete it very slowly . Methyl mercury is not soluble and therefore not excreted . Instead , it accumulates , primarily in the viscera , although also in the muscle tissue . This results in the bioaccumulation of mercury , in a buildup in the adipose tissue of successive trophic levels : zooplankton , small nekton , larger fish , and so on . The older that such fish become , the more mercury they may have absorbed . Anything that eats these fish within the food chain also consumes the higher level of mercury that the fish have accumulated . This process explains why predatory fish such as swordfish and sharks or birds like osprey and eagles have higher concentrations of mercury in their tissue than could be accounted for by direct exposure alone . Species on the food chain can amass body concentrations of mercury up to ten times higher than the species they consume . This process is called biomagnification . For example , herring contains mercury levels at about 0.1 parts per million , while shark contains mercury levels greater than 1 part per million . 

Answer: answer: The consumption of fish is by far the most significant source of ingestion - related mercury exposure in humans and animals. Anything that eats fish also consumes the higher level of mercury that the fish have accumulated.