trawl opening

См. также в других словарях:

• otter trawl — demersal trawl operated by a single vessel in which the horizontal opening of the net is achieved and maintained by angle towed otter boards (large rectangular boards of timber or steel) and the vertical opening by a combination of floats on the… …   Fisheries — dictionary

• bottom pair trawl — a trawl towed by two boats at the same time, the distance between the boats ensuring the horizontal opening of the net …   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

• high-opening trawl — a bottom trawl designed to catch semi demersal or pelagic species …   Dictionary of ichthyology

• low-opening trawl — a bottom trawl designed to capture demersal species …   Dictionary of ichthyology

• bottom trawl — a net shaped like a bag dragged along the sea floor. The lower edge of the net has a thick ground rope or bobbins to prevent net damage and is heavily ballasted. Some trawls are low opening to capture demersal species, others are high opening to… …   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

• commercial fishing — Introduction  the taking of fish and other seafood and resources from oceans, rivers, and lakes for the purpose of marketing them.       Fishing is one of the oldest employments of humankind. Ancient heaps of discarded mollusk shells (shell… …   Universalium

• Fishing trawler — For other types of trawlers, see Trawler (disambiguation). The Irish RSW tank trawler Brendelen[1] in Skagen harbour A fishing trawler (also called a dragger) is a commercial fishing vessel designed to operate fishing trawls. Traw …   Wikipedia

• Trawling — is a method of fishing that involves pulling a large fishing net through the water behind one or more boats. The net that is used for trawling is called a trawl.The boats that are used for trawling are called trawlers. Trawlers vary in size; from …   Wikipedia

• environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …   Universalium