- published: 08 May 2014
- views: 7884
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.
Demersal fish can be divided into two main types: strictly benthic fish which can rest on the sea floor, and benthopelagic fish which can float in the water column just above the sea floor.
Benthopelagic fish have neutral buoyancy, so they can float at depth without much effort, while strictly benthic fish are more dense, with negative buoyancy so they can lie on the bottom without any effort. Most demersal fish are benthopelagic.
Catch limitation in demersal seine fishing
Demersal Fish in the Firth of Clyde
Demersal Fishing in the Kimberly, Western Australia
Restore Florida Bay: Water Levels and Demersal Fish
The Lake Huron Deepwater Demersal Fish Community
Demersal fish
People in the lab at the 2nd Demersal Fish Workshop.
Releasing Sub-legal Atlantic Cod in the Demersal Longline Fishery
Cod: The Fish that Changed the World - History, Recipes, Fishing Stocks (1998)
Demersal on jig
Fish Finder TV -Fishing Rottnest Island with Eddie Sheppard: Snapper, Mackerel & Sharks.
Flat Fish
FreeDiving for Crayfish
amazing fishing Flounders and trout fishing @ Vrist -Denmark...Vissen @ strand van denemarken....