Tidepool Tim says, "As juveniles, lumpfish live within beds of marine vegetation like eelgrass and seaweeds. They attach to substrate with a chest sucker. When they're adults they live in open waters, visiting shallow water to spawn February to June.
Lumpfish eat sea lice, a troublesome parasite that lives on farmed salmon and jeopardizes salmon populations. Some salmon farmers have even introduced lumpfish to their farms to help control the sea lice population."