Demersal fish are those which live on, or near to the bottom of lakes or seas. This area of the water is called the Demersal Zone and is the area in which demersal fish both live and feed. Demersal fish may also be known as ‘bottom feeders’ as they feed from the bottom of the ocean or lake. Demersal fish tend to contain less fish oil than Pelagic fish (see ‘What are Pelagic fish’). The word Demersal derives from the latin word ‘demergere’, meaning = ‘to sink’. Examples of dermesal fish include Cod, Turbot and Halibut.