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BTS-VIIa: Northern Irish Ground Fish Trawl Survey
Fish trawl survey: Northern Irish Ground Fish Trawl Survey. ICES Database of trawl surveys (DATRAS). The International Council for the Exploration of the Sea, Copenhagen. 2010. Online source:

Access data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

The dataset includes age- and length-based catch per unit effort data for commercial fish species in the Irish Sea. more

In the Northern Ireland survey, the sampling design is stratified with fixed-position stations. Stratification is by depth and seabed type. Haul duration is 3 nautical miles at 3 knots over the seabed. Stations in the St George's Channel are 1 nautical mile at 3 knots and have only been surveyed since October 2001. Number of stations is 45 in northern Irish Sea and 12 in St George's Channel. Tows are during day time only. The surveys have been carried out in March and October since 1992. From March 1992 to March 2001, the survey extended from 54° 43' N to 53° 22' N. From October 2001 the survey is extended into the St George's Channel to 52° 18' N. Depth range is from 20 to 120m. The surveys are carried out on the R.V. Lough Foyle, a 43.5m stern trawler of 880 kw and GRT 547 tonnes. The fishing gear is a rock-hopper otter trawl with a 17m footrope fitted with 250 mm non-rotating rubber discs. The gear has a mean vertical opening of 3 m. The door spread varies from around 25m at 20m depth to 40m at 80m depth. A 20mm (inside mesh) codend is fitted.

Biology > Fish
Marine, ANE, Irish Sea

Geographical coverage
ANE, Irish Sea [Marine Regions]

Temporal coverage
From 1993 on [In Progress]
Twice a year

Catch per unit effort

International Council for the Exploration of the Sea (ICES), moredata managerdata provider

Related datasets
Parent dataset:
DATRAS: ICES Database of trawl surveys, more
Published in:
EurOBIS: European Ocean Biogeographic Information System, more

Dataset status: In Progress
Data type: Data
Data origin: Monitoring: field survey
Metadatarecord created: 2010-12-22
Information last updated: 2014-02-04
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