Post is right - please try and avoid double posting - edit it into your last post instead.
All predators, but particularly sea predators, that we eat contain mercury, because it builds up in the food chains as it isn't lost from the body easily. Therefore, while a sardine contains a tiny amount of mercury, a tuna that's eaten thousands of sardines contains noticeable amounts of mercury - so while fish is good for you, eating too many predatory fish like tuna, swordfish or sharks is bad for you because of the mercury.
Shark fin soup is a stupid idea, especially as they're taken from sharks and the bodies dumped - shark meat is actually pretty good.
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