Another possibility is that the salmon used their spiky teeth to dig nests in riverbeds ... s largest living fish—including the whale shark—are also filter feeders that subsist on plankton.

A shark no larger than a human hand that stalked the ancient sea floor 340 million years ago has been dubbed the “chipmunk ...

"No other living (or extinct) salmon possesses teeth with such an unusual orientation ... could have easily killed, or ...