Instrument: Otter Trawl

Acronym:

Otter Trawl

External Identifier:

» skos:broadMatch http://vocab.nerc.ac.uk/collection/L05/current/61/

Description

Otter trawls have large rectangular otter boards which are used to keep the mouth of the trawl net open. Otter boards are made of timber or steel and are positioned in such a way that the hydrodynamic forces, acting on them when the net is towed along the seabed, pushes them outwards and prevents the mouth of the net from closing. The speed that the trawl is towed at depends on the swimming speed of the species which is being targeted and the exact gear that is being used, but for most demersal species, a speed of around 4 knots (7 km/h) is appropriate. More: http://en.wikipedia.org/wiki/Bottom_trawling

Datasets

Dataset Name	Brief Description
Asteroids and Holothurians - Table 1 - Asteroid species - Presence 1 and absence 0 of Asteroid species by station	Asteroids and Holothurians - Table 1 - Asteroid species - Presence (1) and absence (0) of Asteroid species by station
Asteroids and Holothurians - Table 2 - Holothurian species - Number of individuals by station	Asteroids and Holothurians - Table 2 - Holothurian species - Number of individuals by station
Howell fish catch data	numerical abundance, catch-per-unit-effort, percent composition
monkfish_bycatch	Bycatch in the Gillnet Fishery for Monkfish
monkfish_size	Bycatch in the Gillnet Fishery for Monkfish: length, weight data
NEFSC Survey Adult Fish Biomass	Adult fish biomass of the Northeast U.S. Shelf Ecosystem: 1968-2012
Northeast US Adult Fish	Adult fish of the Northeast U.S. Shelf Ecosystem: 1977-1987 and 1999-2008.
Tow log and catch data	Tow log

Database

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Instrument: Otter Trawl