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 — 2015-09-06
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom

1. 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;
e) Surface and bottom temperature and salinity data using the ESM2 profiler/mini-CTD logger and Niskin Bottle.
f) Length, weight and maturity information from individual fish, in support of the EU Data Regulation.
2. Total alkalinity and dissolved inorganic / organic carbon analysis of seawater by filtration at selected stations.
3. Tag and release specimens of starry smooth-hound (Mustelus asterias), greater spotted dogfish (Scyliorhinus stellaris), spurdog (Squalus acanthias), tope (Galeorhinus galeus), common skate (Dipturus batis) species-complex, and blonde ray (Raja brachyura), in support of the ICES Working Group for Elasmobranch Fishes work to inform on stock units for demersal elasmobranchs.
4. To freeze any unusual fish species for subsequent identification / verification in the laboratory, including specimens of eelpout (Zoarces, Lycodes and Lycenchelys), sea scorpions (Cottidae, sub-area IVa only), Sebastes spp., and any unusual fish species, which may also be used in otolith research.
5. To freeze samples of smooth-hound (Mustelus spp.) for biological studies.
6. Record litter caught in the trawl in support of Defra projects.
7. Retain all dead specimens of shad (Alosa spp.) and lamprey (Lampetra fluviatilis) for study by Cefas scientists.
8. Collect fisheries acoustic continuously data at four operating frequencies (38 kHz, 120 kHz, 200 kHz and 333 kHz), using the Simrad EK60 split beam sounder. The data will contribute to the existing 15 year time series of acoustic data in the North Sea and will be used as part of the Defra funded project Poseidon (MF1112) to monitor changes in mackerel distribution and abundance.
9. To retain empty skate egg cases with corresponding positional information for the Shark Trust.
10. Collect plankton biodiversity samples from selected stations for pigment and analytical flow cytometry analysis. If time and conditions allow, additional profiles to be completed with the ESM2 logger.
11. Collecting, preserving and analysing samples of seawater in order to determine the spatial-temporal variability of Transparent Exopolymer Particles (TEP) and DOM in the North Sea. Incubation experiments will be conducted for TEP detection.
12. Cetacean observations will be recorded where possible and send to the SeaWatch Foundation.
13. Collect data on incidental mortality of crabs caught in the trawl in support of Defra projects.
14. Obtain jellyfish samples from the North Sea to allow baseline isotopic signature to be determined in order to compare these with the isotopic signatures of higher trophic level species. Using these isotope maps it should be possible to geolocate different commercially important and ecologically important species to their feeding origins within UK waters.
15. To retain samples of Alloteuthis subulata where possible for further biological study.
16. To collect tissue samples of thornback ray (Raja clavata) in Divisions IVa and IVb for genetic studies.

Narrative in attached cruise report.
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)
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
Data held at BODC 
Discrete samples 
23  Sample taken from ship's non-toxic supply
24  Water bottle hydrocast