I stumbled upon this today while browsing the good ol' intertubes.
Apparently, there's a parasitic isopod out there that's burrowing into fish, eating their tongues, and replacing the tongues with themselves. After doing a little more research, I found that the parasites don't actually eat the tongue. The creature latches on to the fish-tongue's base and leeches blood from it. As the creature grows, less blood makes is able to enter the tongue, and the tongue atrophies. The isopod then takes the tongue's place and consumes blood and mucus from the host's mouth. Disgusting.

BBC article
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