Adjective
of or relating to fish and marine life that feed on the bottom of a body of water
Source: WordNetbottom feeding
Wading and bottom-feeding animals (such as manatee) need to be heavier than water in order to keep contact with the floor or to stay submerged. Source: Internet
While the proboscis of a spoon worm is on the surface it is at risk of predation by bottom-feeding fish. Source: Internet