bottom fish

noun
1.
any of certain fishes that live at or near the bottom of a body of water, as certain of the cod and related species, the flatfishes, and catfishes.
Also called ground fish.

bottom-fish

[bot-uh m-fish] /ˈbɒt əmˌfɪʃ/
verb (used without object)
1.
to fish with a weighted line for fish that feed close to the bottom.
Also, ground-fish.
Origin
1840-50