Definition of demersal in English:

demersal

adjective

  • (typically of fish) living close to the floor of the sea or a lake.

    Often contrasted with pelagic
    • ‘The starkest fact highlighting the plight of fishing is that the amount of adult demersal fish - those living on the seabed - has fallen by 90 per cent since the early 1970s.’
    • ‘Groundfish are demersal fish species; such as cod, halibut, haddock, and pollock, that feed at or near the ocean floor.’
    • ‘In the winter they will fish for the demersal species and due to their small salmon quota it is no longer a major fishing option in the summer months.’
    • ‘A small beginning has been made to developing the theory of metapopulations of demersal fishes, frequently in the context of reef fish management.’
    • ‘These fish have demersal eggs, but do not bury the eggs and do not attach them to specific substrates.’

Origin

Late 19th century: from Latin demersus (past participle of demergere submerge, sink from de- down + mergere plunge) + -al.

Pronunciation:

demersal

/dəˈmərsəl/