What is the world's largest fish?
The harmless whale shark holds the title of largest fish, with the record being a 59 footer captured in Thailand in 1919.
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beluga whales are toxic biohazards
Beluga whales are at the top of the food chain. A nice distinction, however, it also means they acquire the sum total of toxins in the organisms in that chain. Since PCBs and heavy metals don't break down in any organism they accumulate instead.
So when a Beluga eats a salmon that ate a crustacean that grubbed on some plant, all the PCBs and heavy metals that these organisms absorbed end up in the beluga.
Belugas, in fact, are so full of contaminants, when they are found beached they qualify as a toxic biohazard.
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