Here's what it looks like when the louse replaces a fish's tongue. While other parasites may seem like they could be doing something similar, they don’t quite cross the line into full organ ...

While the nets were empty the underwater floor wasn't, instead it was littered with dead fish that had the life sucked out of them from these parasites.

There is the Banggai cardinal fish, found only in Indonesia, which keeps its eggs and newly hatched babies in its mouth for two weeks. Then, there are gruesome parasites, his latest obsession.

ODFW’s fish health lab has detected a novel parasite in sick rainbow trout that were raised at Klamath Falls, Rock Creek and Elk River hatcheries, Oregon Dept. of Fish and Wildlife reported Tuesday.

More recently, the object of his fascination has turned to parasites. It’s the stuff of horror films: Smith recalls one that lives in the nostril of a crocodile fish. Another attacks the ...

There is the Banggai cardinal fish ... eating away its tongue, and staring out ominously with two black specks for eyes. An anemonefish with a tongue-biter isopod parasite peering out of its ...