Cruise inventory

FRV Scotia 1112S

Cruise plan

Cruise Info. 
Ship name (ship code)FRV Scotia (748S)
Cruise identifier1112S
Cruise period2012-09-06 — 2012-09-14
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnUllapool, United Kingdom
PurposeFisheries
ObjectivesObjectives

1. To undertake the bottom trawl survey of haddock on the Rockall Plateau to depths of 350 m.
2. To deploy a CTD at each trawl station 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 map seabed habitats and coral reefs using towed VMUX chariot video system and/or the swathe multibeam echosounder.

Procedures

The primary objective of this part of the survey is to assess the state of the haddock stock on the Rockall Plateau. Although the Rockall haddock survey has existed for a number of years, since 2011 a new semi random stratified survey design is now utilised comprising four sampling strata separated according to depth. The overall survey coverage reflects that of the previous fixed station design, however, the sampling intensity for each stratum reflects the fish density in each stratum. Trawling will be carried out during the hours of daylight at randomly selected locations within the 350 metre contour. Forty 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: 2 stations at 0-140m, 12 stations at 140-200m, 11 stations at 200-250m and 15 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 06:00 hrs and continue until approximately 20:00 hrs. 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 in line with MSS Standing Instructions. A CTD will be deployed at each trawl station.

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 15 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.

Normal contacts will be maintained with the Laboratory.
Chief scientistJames Drewery (Marine Scotland Aberdeen Marine Laboratory)
ProjectRockall Haddock Survey
Cruise programmeFRV Scotia 1112S cruise programme 1112s.pdf — access key 'C' (0.06 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificRockall Plateau
Track chartsFRV Scotia 1112S cruise track — 1112strk.pdf (0.04 MB) 
Data held at BODC 
Series/Profiles 
20  CTD/STD cast
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Salinity of the water column
Concentration of suspended particulate material in the water column
Temperature of the water column
Reference numbers
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Salinity of the water column
Concentration of suspended particulate material in the water column
Temperature of the water column
Reference numbers

BODC idDate/TimeLocationDoc.
11825072012-09-08 12:23 57° 12' 54" N  13° 44' 25" W  View metadata report for BODC series reference number 1182507
11825812012-09-10 06:05 57° 27' 4" N  14° 6' 1" W  View metadata report for BODC series reference number 1182581
11826732012-09-12 04:32 55° 57' 30" N  15° 18' 33" W  View metadata report for BODC series reference number 1182673
11825202012-09-08 20:37 57° 35' 50" N  13° 0' 41" W  View metadata report for BODC series reference number 1182520
11824762012-09-08 07:20 56° 54' 35" N  13° 34' 34" W  View metadata report for BODC series reference number 1182476
11825682012-09-09 21:36 58° 3' 4" N  14° 19' 19" W  View metadata report for BODC series reference number 1182568
11826122012-09-10 17:21 57° 8' 16" N  14° 5' 17" W  View metadata report for BODC series reference number 1182612
11826612012-09-11 19:33 56° 25' 3" N  15° 21' 20" W  View metadata report for BODC series reference number 1182661
11824882012-09-08 10:02 57° 1' 40" N  13° 50' 10" W  View metadata report for BODC series reference number 1182488
11825192012-09-08 14:58 57° 20' 46" N  13° 27' 24" W  View metadata report for BODC series reference number 1182519
11825322012-09-09 04:31 57° 37' 52" N  13° 24' 33" W  View metadata report for BODC series reference number 1182532
11825442012-09-09 07:59 57° 38' 13" N  13° 8' 56" W  View metadata report for BODC series reference number 1182544
11825562012-09-09 12:59 58° 3' 20" N  13° 14' 10" W  View metadata report for BODC series reference number 1182556
11825932012-09-10 08:26 57° 45' 16" N  13° 52' 50" W  View metadata report for BODC series reference number 1182593
11826002012-09-10 13:20 57° 25' 41" N  13° 55' 39" W  View metadata report for BODC series reference number 1182600
11826242012-09-11 04:30 57° 5' 12" N  14° 55' 56" W  View metadata report for BODC series reference number 1182624
11826362012-09-11 11:43 56° 37' 33" N  14° 45' 41" W  View metadata report for BODC series reference number 1182636
11826482012-09-11 16:04 56° 25' 5" N  15° 3' 42" W  View metadata report for BODC series reference number 1182648
11826852012-09-12 17:16 56° 54' 42" N  14° 19' 40" W  View metadata report for BODC series reference number 1182685
11826972012-09-13 07:46 56° 51' 38" N  14° 8' 30" W  View metadata report for BODC series reference number 1182697