Isopods are opportunistic scavengers, meaning that they'll eat just about anything that crosses their path, no matter how long it's been dead. Anything that makes its way down to their part of the neighborhood in the benthic zone is fair game, and makes for a reliable source of food, as long as there's no competition. While food is available, isopods will gorge themselves to ensure they have enough to survive until their next meal. As a bottom feeder and a scavenger, you may have to wait a while until something ends up that far down in the ocean. Besides carrion, isopods have also been observed to feast on small, marine prey items such as young sponges and small fish.