Undertake a co-ordinated demersal trawling survey of gurnard species on the Rockall Bank to investigate possible predation on juvenile haddock stock.
This trawl survey follows a set of protocols drawn up by an industry science survey planning group made up of Marine Scotland scientists and fishing representatives. These protocols share much in common with the sampling regimes described in Marine Scotland standing instructions for demersal trawl surveys.
One haul of 30 minutes duration will be made at each sampling station; trawling operations will occur in waters up to a maximum of 500 m in areas clear of local static gear. The Scanmar system will be used to monitor wing spread, door spread and distance covered during each haul.
A DST logger will be deployed on the trawl at each station to monitor salinity, depth and temperature.