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Deep water demersal fish live beyond this edge, mostly down the continental slopes and along the continental rises which drop to the abyssal plains. This is the continental margin, constituting about 28% of the total oceanic area. [20] Other deep sea demersal fish can also be found around seamounts and islands.
Nuchequula gerreoides are demersal fish, which means that they normally live close to the floor in seas or lakes. [4] They periodically migrate from salt water to fresh water, this is a process called amphidromous. [5] Generally, fish that do this migrate for breeding purposes, but the cause of their migration is unknown.
White fish (Atlantic cod) White fish fillet (halibut – on top) contrasted with an oily fish fillet (salmon – at bottom)Whitefish or white fish is a fisheries term for several species of demersal fish with fins, particularly Atlantic cod (Gadus morhua), whiting (Merluccius bilinearis), haddock (Melanogrammus aeglefinus), hake (Urophycis), and pollock (Pollachius), among others.
Halibut are strong and fight strenuously when exposed to air. Smaller fish will usually be pulled on board with a gaff and may be clubbed or even punched in the head to prevent them from thrashing around on the deck. In both commercial and sport fisheries, standard procedure is to shoot or otherwise subdue very large halibut over 70–90 kg ...
Battered plaice is often served hot with french fries and remoulade sauce as a main dish; this fish and chips variant is popular [20] and is commonly available on children's menus in Danish restaurants. Breaded frozen plaice, ready to be baked or fried at home, are readily available in supermarkets.
The distinction between demersal species of fish and pelagic species is not always clear cut. The Atlantic cod (Gadus morhua) is a typical demersal fish, but can also be found in the open water column, and the Atlantic herring (Clupea harengus) is predominantly a pelagic species but forms large aggregations near the seabed when it spawns on banks of gravel.
A flounder's diet consists mainly of fish spawn, crustaceans, polychaetes and small fish. Flounder typically grow to a length of 22–60 centimeters (8.7–23.6 in), and as large as 95 centimeters (37 in). Their width is about half their length.
It is a demersal fish with a depth range which is between 17 and 1,600 m (56 and 5,249 ft) but it is more usually found at depths less than 100 metres (330 ft). [2]