FRV Scotia 1113S
|Ship name (ship code)||FRV Scotia (748S)|
|Cruise period||2013-09-09 — 2013-09-18|
|Port of departure||Aberdeen, United Kingdom|
|Port of return||Ullapool, United Kingdom|
1. To undertake the bottom trawl survey of haddock on the Rockall Plateau to depths of 350 m.
2. To deploy a CTD at selected trawl stations to collect temperature and salinity profiles.
3. To collect samples (genetics and otoliths) for key species for population studies, contaminant studies and other requests, e.g. MSFD litter recording.
4. To collect stomachs of Grey Gurnard to inspect for the presence of juvenile haddock.
5. To map seabed habitats and coral reefs using towed VMUX chariot video system.
Procedures Part 1
The primary objective of this part of the survey is to assess the state of the haddock stock on the Rockall Plateau. The Rockall haddock surveys employs a semi random stratified survey design comprising 4 sampling strata separated according to depth. Sampling intensity within each of the four strata reflects the fish density observed in each of the strata using haddock abundance data from previous surveys. Trawling will be carried out during the hours of daylight at randomly selected locations within the 350 metre contour. Thirty six tow positions have been generated and their allocation within each depth stratum is displayed in figure 1. The number of stations within each depth strata is as follows:
4 stations at 0 - 150m, 18 stations at 150 - 200m, 10 stations at 200 - 250m and 4 stations at 250 - 350m. One haul of 30 minutes duration will be made at each sampling station. Daily start times for survey stations will be at approximately 06:00h and continue until approximately 20:00h. The Scanmar system will be used to monitor wing spread, door spread and distance covered during each haul. A bottom contact sensor will be mounted on the footrope to record the distance of the trawl off the seabed. Catches will be worked up according to the protocols for International Bottom Trawl Surveys and all hauls will be processed and the data entered using the newly acquired EDC (Electronic Data Capture) and FSS (Fishing Survey System). A CTD will be deployed at selected trawl stations.
At night, the VMUX towed video chariot will be deployed in and outside areas closed for the protection of coldwater coral reefs and in areas of interest identified within the 12 mile limit of the islet of Rockall. In the case of weather conditions curtailing deployment of the VMUX, the swathe MBES will be considered as an option for opportunistic mapping of the seabed building on previous swathe mapping of the area. Upon completion of the Rockall haddock survey, passage will be made to Ullapool for half-landing on or around 18 September. The GOV net and associated gear will be stripped down and offloaded together with TV kit at Ullapool in exchange for the deepwater trawl gear.
|Chief scientist||James Drewery (Marine Scotland Aberdeen Marine Laboratory)|
|Cruise programme||(0.45 MB)|
|General||North East Atlantic Ocean (limit 40W)|
|Track charts||(0.19 MB)|