Although generalist scavengers , these isopods are mostly carnivorous and feed on dead whales , fish , and squid ; they may also be active predators of slow-moving prey such as sea cucumbers , sponges , radiolarians , nematodes , and other zoobenthos , and perhaps even live fish .

They may also be active scavengers , and hunt slow-moving prey , such as sea cucumbers , sponges , nematodes .
