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This parasite (who looks like a fish, but is not a fish) is considered as delicacy here. Attaches with his mouth to a fish, and feeds on it. Sometimes when some human drowns in a sea, and later his corpse gets washed ashore, corpse is covered in these parasites.
We have interesting relationship. We like taste of them, when we have an opportunity. And they like taste of us, when THEY get an opportunity.