1. To undertake a nationally co-ordinated demersal trawling survey of anglerfish species in ICES area IVa Northern North Sea.
2. To obtain temperature and depth profiles at each trawling station.
3. To record and map distributions of megrim, four spot megrim and cod.
4. To collect biological data on Angler, cod, megrim and four spot megrim.
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.
The survey track and sampling locations will be delivered to the skipper prior to departure.
One haul of 60 minutes duration will be made at each sampling station; trawling operations will occur in waters up to a maximum of 500 m. Daily starting times will be 06:00 and all trawling should be complete by approximately 24:00 each night. The Scanmar system will be used to monitor wingspread, door spread and distance covered during each haul. A bottom contact sensor will be mounted on the footrope.
Catches will be worked up according to the protocols for Marine Scotland anglerfish surveys, which are similar in principle to Marine Scotland standing instructions.
A mini logger may be deployed on the trawl at each station to monitor salinity, depth and temperature.
M Gault (Marine Scotland Aberdeen Marine Laboratory)