midwater trawl

midwater trawl
a net towed through the water column by one boat, the net being positioned above the bottom and below the surface. It may have otter doors that function to keep the net mouth open and depressor plates that function to make it fish deeper, or two vessels pair trawling keep the mouth open. The front net sections are often made with very large meshes or ropes, which herd the fish schools towards the net aft sections. The fishing depth is usually controlled by means of a net sounder (netsonde). Also called midwater otter trawl

Dictionary of ichthyology. 2009.

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  • Larsen midwater trawl — a wingless, midwater trawl with a square mouth towed between two boats. Also called atom trawl, Larsen trawl, floating trawl, Larsen two boat trawl, two boat pelagic trawl …   Dictionary of ichthyology

  • midwater otter trawl — midwater trawl …   Dictionary of ichthyology

  • Midwater trawling — is trawling, or net fishing, at a depth that is higher in the water column than the bottom of the ocean. It is contrasted with bottom trawling. Midwater trawling is also known as pelagic trawling and bottom trawling as benthic trawling. External… …   Wikipedia

  • Isaac-Kidd midwater trawl — a trawl designed for catching small organisms, including fish, at great depth. Used by researchers …   Dictionary of ichthyology

  • midwater pair trawl — a net towed through the water column by two boats, thus ensuring the horizontal opening of the net. Such nets are designed and rigged to work in midwater. Surface trawls are also included in this category …   Dictionary of ichthyology

  • trawl — 1) a bag shaped net towed behind a ship either along the sea floor or in midwater, having a buoyed head rope and a weighted foot rope to keep the net mouth open. It may be towed by one or two ships; 2) in Newfoundland …   Dictionary of ichthyology

  • atom trawl — a wingless, midwater trawl with a square mouth towed between two boats. Also called Larsen midwater trawl, Larsen trawl, floating trawl, Larsen two boat trawl, two boat pelagic trawl …   Dictionary of ichthyology

  • two boat pelagic trawl — a wingless, midwater trawl with a square mouth towed between two boats. Also called Larsen midwater trawl, Larsen trawl, floating trawl, Larsen two boat trawl, atom trawl …   Dictionary of ichthyology

  • floating trawl — a trawl designed to be worked off the bottom. Also called midwater trawl, pelagic trawl. See also Larsen midwater trawl …   Dictionary of ichthyology

  • British Columbian trawl — a midwater trawl set from the stern. It has curved doors (q.v.) at the end of wire side pennants (or lines) which allows for a wider opening of the net when fishing. The mouth of the net is square and the net has four equally tapering sides.… …   Dictionary of ichthyology

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