Study ID 466

Trawl Survey Data from Rockall Scotland (1986 - 2008)

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Realm: Marine
Climate: Temperate
Biome: Temperate shelf and seas ecoregions
Central latitude: 56.990544
Central longitude: -9.072550
Duration: 23 years, from 1986 to 2008

27592 records

94 distinct species

Across the time series Melanogrammus aeglefinus is the most frequently occurring species

Citation(s):

Neat, F. & Campbell, N. (2011) Demersal fish diversity of the isolated Rockall plateau compared with the adjacent west coast shelf of Scotland. Biological Journal of the Linnean Society, 104, 138–147. doi:10.1111/j.1095-8312.2011.01699.x.

Methods

Data used in this study date back to 1986 and are derived from scientific otter trawl surveys undertaken by the Marine Laboratory (Aberdeen). Two different types of net were used over this period but the change was made simultaneously in both areas. From 1986 to 1997 a net known as the 48-ft Aberdeen trawl was used. This net had a vertical opening of approximately 3 m and a wing spread of 16 m. The cod-end contained a liner of 20-mm mesh 1 tonne trawl doors were used. The trawl duration was 60 min at a speed of between 3 and 4 knots over the ground. In 1998 the Grande Ouverture Verticale (GOV) trawl came into use. This is the ICES International Bottom Trawl Survey standard gear (ICES 2006). The GOV has a vertical opening between 4.5 and 5 m with a wing spread of around 20 m. The cod-end contains a liner of 20-mm mesh 1 tonne trawls doors are used. The trawl duration is 30 min at a speed of between 3 and 4 knots over the ground. Unit of abundance = IndCountInt, Unit of biomass = NA