Free Online Dictionary |Wikipedia English The Free
Encyclopedia||Download this dictionary| Demersal fish live on or
near the bottom of the sea or lakes. They occupy the sea floors
and lake beds, which usually consist of mud, sand, gravel or
rocks. In coastal waters they are found on or near the
continental shelf, and in deep waters they are found on or near
the continental slope or along the continental rise. They are
not generally found in the deepest waters, such as abyssal
depths or on the abyssal plain, but they can be found around
seamounts and islands. The word demersal comes from the Latin
demergere, which means to sink. Demersal fish are bottom
feeders. They can be contrasted with pelagic fish which live and
feed away from the bottom in the open water column. Demersal
fish fillets contain little fish oil (one to four percent),
whereas pelagic fish can contain up to 30 percent. |See more at
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