Cruise inventory

FRV Scotia 1412S

Cruise plan

Cruise Info. 
Ship name (ship code)FRV Scotia (748S)
Cruise identifier1412S
Cruise period2012-10-16 — 2012-10-22
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeFisheries
ObjectivesObjectives

1. Obtain individual in-situ TS measurements of mackerel.
2. Obtain sonar recordings of mackerel schools.
3. Obtain echosounder recordings of mackerel schools.
4. Obtain biological samples of mackerel from schools (trawl).
5. Obtain biological samples of mackerel from dispersed single targets (rod and line).
6. Calibrate Sv and TS gains on the Simrad EK60.
7. Obtain and freeze a length stratified sample of mackerel for analysis on the laboratory.
8. Obtain biological samples of spurdog.
9. Obtain echosounder recordings of spurdog.
10. Obtain hydrographic data from vertical CTD casts

Procedure

All gear will be loaded in Aberdeen between 13 and 15 October. The vessel will depart Aberdeen on 16 October and make passage for Loch Erribol, where a calibration of all echosounders will take place (approximately 8-12 hours at anchor). Crew training and trial deployments of fishing gear will take place en route as convenient for the fishing master.

Scotia will make her way to the survey area after the calibration has been completed. However, this is based on the expected position of the Scottish pelagic fleet which will be fishing for mackerel at this time. Contact will be maintained with the fleet and the survey area/design may be altered to reflect any changes in the fish distribution. The survey will follow a pattern of parallel transects running east/west, at normal steaming speed (approximately 10.5 knots) until an area with suitable shoals is found. Work will then be concentrated in that area.

Acoustic data will be collected at four frequencies (18, 38, 120 and 200 kHz) between 0800 and 2000 hours. Fish shoals seen on the echosounder will be identified using a pelagic trawl (PT160). Trawling operations will be carried out up to three times per day at anytime between 0800 and 2000. The vessel's netsonde systems will be required to monitor catch density and position of shoals in the water column during trawling. Where there is evidence of shoals dispersing or single targets then fishing may also be carried out using rod and line.

Biological sampling of all species caught will be carried as per standard sampling protocol. If required a vertical hydro dip will be carried out immediately following a pelagic trawl, this will require the vessel to use its DP system to remain on station. The ships thermosalinograph will be run continuously to obtain sea surface temperature and salinity throughout the survey area.

Acoustic surveying may continue on an opportunistic basis between 2000 and 0800 to collect data on spurdogs. Rod and line fishing will be carried out to obtain biological samples of these species.

Scotia will be unloaded of fishing and scientific gear on her return to Aberdeen on 22 October 2012.
Chief scientistPhilip J Copland (Marine Scotland Aberdeen Marine Laboratory)
ProjectSV02NP (20158)
Ocean/sea areas 
GeneralNorth Sea
SpecificNorthern North Sea
Track chartsFRV Scotia 1412S cruise track — 1412strk.pdf (00 MB) 
Data held at BODC 
Series/Profiles 
4  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.
11840892012-10-19 20:51 60° 25' 25" N  1° 38' 53" W  View metadata report for BODC series reference number 1184089
11840772012-10-19 09:49 60° 38' 44" N  1° 23' 4" W  View metadata report for BODC series reference number 1184077
11841082012-10-20 19:49 60° 22' 31" N  1° 41' 13" W  View metadata report for BODC series reference number 1184108
11840902012-10-20 09:36 60° 22' 42" N  1° 43' 5" W  View metadata report for BODC series reference number 1184090