Cruise inventory

FRV Scotia 0313S

Cruise plan

Cruise Info. 
Ship name (ship code)FRV Scotia (748S)
Cruise identifier0313S
Cruise period2013-02-19 — 2013-03-12
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeFisheries
ObjectivesObjectives

1. Demersal trawling survey of the grounds off the north and west of Scotland in ICES Subarea VIa.
2. To obtain temperature and salinity data from the surface and seabed at each trawling station.
3. Collect additional biological data in connection with the EU Data Collection Framework (DCF).
4. Opportunistic sampling using the Gulf 7 to determine densities of mackerel eggs within the area covered by the trawl survey.

Procedures

General

Loading of the trawl gear and scientific equipment will take place on 15 February with rigging and testing being completed on the same day. Scotia will then sail on the morning of 19 February. A training haul will be undertaken during the passage north to ensure all fishing gear/sensors are working effectively. Scotia will then proceed north and commence fishing operations the next morning on predefined stations off the north Scottish coast and west of 4'W with weather conditions thereafter determining the route taken on the survey.

Trawling

This is a random-stratified survey design with trawl locations being randomly distributed within ten predefined sampling strata (See Figure1). The intention is for trawls to be undertaken on suitable ground as near to the specified sampling position (See Table 1) as is practicable and where possible within a radius of 5 nautical miles of the sampling position. In the event that suitable ground cannot be sourced to trawl at a particular sample location (or within 5nm of) the nearest 'secondary' or additional station will be used. Hauls will be of 30 minutes duration and in the main fishing operations will be restricted to daylight hours between 0700 and 1800 though exact start and finish times will vary slightly according to geographical location. The Scanmar system will be used to monitor the headline height, wing spread and door spread for each haul. Bottom contact data from each trawl will also be collected using the NOAA bottom contact sensor which will be mounted on a bar in the centre of the ground-gear. In addition to the routine sampling, biological data will be collected for target species in line with the EU data regulation. All fish will be processed in accordance with Standing Instructions.

Hydrography

CTD casts will be taken at each trawl station; in addition, the thermosalinograph will run continuously to obtain sea surface temperature and salinity throughout the survey area.

Gulf 7 sampling

Oblique tows will be carried out opportunistically during the hours of darkness using the Gulf 7 Sampler. The intention will be to collect, where possible, one sample within each half statistical rectangle bisected vertically (e.g. 45E1W/45E1E). The daily sampling plan will be discussed and then decided after consultation with the Captain and Fishing Master.

Normal contact will be maintained with the Marine Laboratory.
Chief scientistFinlay Burns (Marine Scotland Aberdeen Marine Laboratory), James Drewery (Marine Scotland Aberdeen Marine Laboratory)
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
Track chartsFRV Scotia 0313S cruise track — 0313strk.pdf (00 MB)