RV Cefas Endeavour 17/17

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Cefas Endeavour (74E9)
Cruise identifier17/17
Cruise period2017-08-04 — 2017-09-02
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom

To carry out a groundfish survey of the North Sea as part of the ICES coordinated IBTS, using a hybrid GOV trawl in order to obtain information on:
a) Distribution, size composition and abundance of all fish species caught.
b) Age - length distribution of selected species.
c) Distribution of fish in relation to their environment.
d) Distribution of macrobenthos and anthropogenic debris.
e) Surface and bottom temperature and salinity data using CTD cast and Niskin Bottle.
f) Length weight & maturity information using individual fish measurements, in support of the EU Data Regulation.
g) To collect marine litter from the trawl


RV Cefas Endeavour sailed from Lowestoft on 4 August 2017 to begin the Quarter 3 IBTS North Sea Groundfish Survey for the UK. A valid GOV trawl haul was successfully completed at all of the 77 primary station positions. Surface and bottom salinity samples and a water column CTD profile were taken at 50 of the primary stations fished. A total of 9779 biological samples were taken for the primary target species. In addition, a total of 59 elasmobranchs were captured, tagged and released during the survey. RV Cefas Endeavour returned back to Lowestoft on 2 September.
Chief scientistBenjamin Hatton (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)
ProjectICES International Bottom Trawl Survey (IBTS)
Coordinating bodyInternational Council for the Exploration of the Sea (ICES)
Cruise programmeRV Cefas Endeavour 17/17 cruise programme endeavour17_17.pdf  (0.21 MB) 
Cruise reportRV Cefas Endeavour 17/17 cruise report endeavour17_17.pdf (2.25 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificNorth Sea (ICES area IV)
Track chartsRV Cefas Endeavour 17/17 cruise track — endeavour17_17trk.pdf (0.09 MB) 
Physical oceanography 
CTD stationsQuantity: number of stations = 50
Description: Salinity samples collected at surface and bottom using niskin at 50 stations
CTD stationsQuantity: number of stations = 64
Description: 64 CTD casts; 50 standard casts and 14 additional casts with ESM2 profiler only
Chemical oceanography 
OxygenQuantity: number of samples = 27
Description: 27 bottom water samples collected for dissolved oxygen analysis
Other contaminant measurementsQuantity: number of samples = 416
Description: 416 pieces of litter were found in the GOV trawl during the survey
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of experiments = 19
Description: Pigment and flow cytometry conducted at 56 stations
Demersal fishQuantity: number of hauls = 105
Description: 77 stations fished with hybrid GOV, one haul completed for Denmark and 23 additional tows, four were invalid.
TaggingsQuantity: number of specimens = 65
Description: 59 elasmobranchs and six wolf-fish tagged with Petersen discs
Other biological/fisheries measurementQuantity: number of samples = 9779
Description: 9779 biological samples, including otoliths collected for ageing purposes for commercial fish