1) Living on or near the sea bed 
living on or near the sea bed 
subaqueous; living underwater; sinking to the bottom
Found on or near the bottom of a body of water.
living on the sea bottom. 
living or found in the deepest part of a body of water
refers to fish such as cod, haddock and plaice which live primarily on or near the seabed.
Without buoyancy; sinking in the absence of countervailing forces.
(L: de=down; mergere to plunge/dip) living near but not upon the seabottom of the continental shelf. Large demersal fishes are often fished commercially.
living on or near the sea bed
Living on or near the bottom of a body of water. 
Living in close relation with the bottom and depending on it. Cods, groupers, crabs, and lobsters are demersal resources.
Refers to fish, such as cod, haddock and plaice, which live primarily on or near the seabed.