RV Cefas Endeavour 18/15

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Cefas Endeavour (74E9)
Cruise identifier18/15
Cruise period2015-08-08 — 2015-09-05
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
ObjectivesPrimary Objective: To carry out a groundfish survey of the North Sea as part of the ICES coordinated IBTS, using a standard 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 rosette 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 8 August 2015 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 76 primary station positions. Surface and bottom salinity samples and a water column CTD profile were taken at 75 of the primary stations fished. A total of 8311 biological samples were taken for the primary target species. In addition, a total of 21 elasmobranchs were captured, tagged and released during the survey. RV Cefas Endeavour returned back to Lowestoft on 5 September.
Chief scientistJames Robert Ellis (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory), Sophy McCully Phillips (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 18/15 cruise programme endeavour18_15.pdf  (0.15 MB) 
Cruise reportRV Cefas Endeavour 18/15 cruise report endeavour18_15.pdf (2.87 MB) 
Ocean/sea areas 
GeneralNorth Sea
Physical oceanography 
CTD stationsQuantity: number of stations = 45
Description: 45 CTD casts
CTD stationsQuantity: number of stations = 45
Description: Salinity samples collected at surface and bottom using niskin at 45 stations.
Other contaminant measurementsQuantity: number of observations = 198
Description: 198 pieces of litter observed at 67 stations.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of experiments = 60
Description: Pigment and flow cytometry conducted at 60 stations
Particulate organic matter (inc POC, PON)Quantity: number of samples = 91
Description: Particulate in/organic carbon analysis of seawater was conducted across 76 stations
Dissolved organic matter (inc DOC)Quantity: number of experiments = 48
Description: Seawater collected from 24 CTD stations and 24 surface samples, incubations conducted to determine rate of dissolved organic matter degradation by the natural microbial community
Demersal fishQuantity: number of hauls = 77
Description: 76 stations fished with hybrid GOV, one additional tow
TaggingsQuantity: number of specimens = 21
Description: 21 elasmobranchs tagged with Petersen discs
Other biological/fisheries measurementQuantity: number of samples = 8311
Description: 8311 biological samples, including otoliths collected for ageing purposes for commercial fish
Data held at BODC 
Discrete samples 
23  Sample taken from ship's non-toxic supply
24  Water bottle hydrocast