FRV Scotia 1112S
Cruise plan
| Cruise Info. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ship name (ship code) | FRV Scotia (748S) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cruise identifier | 1112S | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cruise period | 2012-09-06 — 2012-09-14 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Status | Completed | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Port of departure | Aberdeen, United Kingdom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Port of return | Ullapool, United Kingdom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Purpose | Fisheries | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Objectives | Objectives
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 scientist | James Drewery (Marine Scotland Aberdeen Marine Laboratory) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Project | Rockall Haddock Survey | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cruise programme |  (0.06 MB) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ocean/sea areas | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| General | North East Atlantic Ocean (limit 40W) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Specific | Rockall Plateau | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Track charts | (0.04 MB) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Data held at BODC | Get data | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series/Profiles | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 20 CTD/STD cast | Reference numbers Salinity of the water column Vertical spatial coordinates Temperature of the water column Concentration of suspended particulate material in the water column Density of the water column Electrical conductivity of the water column Chlorophyll pigment concentrations in water bodies Reference numbers Salinity of the water column Vertical spatial coordinates Temperature of the water column Concentration of suspended particulate material in the water column Density of the water column Electrical conductivity of the water column Chlorophyll pigment concentrations in water bodies
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