The nutria will eat every thing. I've seen them nibbling a dead fish so I guess they eat fish too. Those buggers can swim well so they possibly can catch fish although I've never seen them catching any fish. As for me when I see um, they are as good as dead. A couple nutria can wreak havoc on your pond vegetation in a hurry.

"Honey, your rare moments of clarity are simply delusions."
LadyRider