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BODC Cruise Metadata Report for FRV Clupea (74CU) cruise 0807C

Introduction

This report collates information from the BODC cruise inventory and oceanographic databases. It presents

Cruise Inventory Information

Long name FRV Clupea (74CU) cruise 0807C
Short name 0807C
Objectives and Narrative Objectives

The primary objective of this monitoring cruise was to determine the abundance of sandeels on the main sandbank fishing grounds (the Wee Bankie, Marr Bank and Berwick's Bank) within the northwestern North Sea sandeel closure area. The absolute abundance index is derived through combination of a demersal trawl survey index of sandeel abundance in the seabed sediments and an estimate of the abundance of sandeels in the water column determined by acoustic survey. The cruise thus had the following objectives:

1. To carry out an acoustic survey to determine an abundance estimate for sandeels in the in the water column. Three frequencies, 38, 120, and 200 kHz were used to aid species recognition. This acoustic survey also produced herring and sprat abundance estimates. Concentrations of fish were sampled using the pelagic trawl to determine species composition and length frequency distributions. Sub samples of the fish caught were weighed and had otoliths removed to establish length-weight relationships and age composition.

2. To carry out a demersal trawl survey to determine an abundance index for sandeels in the seabed sediment. This demersal trawl survey also produced abundance indices for herring and sprats, the two other main "prey" species, as well as abundance indices for the major piscivorous fish predators in the area, whiting, haddock and cod. At each trawl station, the length frequency of all fish species caught was determined. Sub-samples of sandeels, herring, sprats, cod, haddock, and whiting were weighed to determine length-weight relationships. Otoliths were removed from sandeels and clupeids to determine age composition. Sub-samples of the gadoid predators were retained and frozen for subsequent dietary and age composition analysis if required.

3. Simultaneously with the demersal trawl survey, hydrographic survey was undertaken using a Seabird 19 CTD sampler fitted with a fluorometer to dete
Ship FRV Clupea
Departure Port Fraserburgh, United Kingdom
Departure Date 2007-06-01
Arrival Port Fraserburgh, United Kingdom
Arrival Date 2007-06-14
Principal Scientist(s) Simon Greenstreet (Fisheries Research Services Aberdeen Marine Laboratory)
Responsible Organisation Fisheries Research Services Aberdeen Marine Laboratory
Associated Project(s) MF07N
IHB Sea Areas Visited North Sea
Marsden Squares Visited 181;3
Work Area Description Northwestern North Sea
Work Area Bounding Polygon 55N,5W; 60N,5W; 60N,0E; 55N,0E; 55N,5W
Southern Limit 55N
Northern Limit 60N
Western Limit 5W
Eastern Limit 0E

Cruise Inventory Datasets

Physical oceanography  
Subsurface temperature and salinity measurements Quantity: number of stations = 19
Description: hydrography  
Surface measurements underway (T,S) Quantity: number of stations = 19
Description: hydrography  
Water bottle stations Quantity: number of stations = 19
Description: water samples for chlorophyll analysis  
Biology and fisheries  
Acoustic reflection on marine organisms. Quantity: number of surveys = 3
Description: acoustic surveys  
Birds Quantity: number of surveys = 4
Description: 5 minute seabird surveys  
Demersal fish Quantity: number of stations = 19
Description: demersal trawling  
Mammals and reptiles Quantity: number of specimens = 13
Description: marine mammal sightings: minke whale, bottlenose dolphin, white-beacked dolphine, porpoise and grey seal  
Other biological/fisheries measurement Description: sandeel and clupeid otolith samples  
Pelagic fish Quantity: number of stations = 4
Description: pelagic trawl  
Phytoplankton pigs (eg chlorophyll, fluorescence) Quantity: number of stations = 19
Description: water samples for chlorophyll analysis  
Geology and geophysics  
Single-beam echosounding Quantity: number of surveys = 3
Description: acoustic surveys  

Cruise Inventory Mooring/Buoy Operations

No information on datasets is currently available

Summary of BODC Data Holdings for the Cruise

National Oceanographic Database

Summary

# Series Instrument Description Parameters
19 CTD/STD cast Chlorophyll pigment concentrations in water bodies
Electrical conductivity of the water column
Reference numbers
Salinity of the water column
Temperature of the water column
Vertical spatial coordinates

Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)

Full List

BODC Reference Instrument Description Date/Time Location  
905561 CTD/STD cast 2007-06-08 06:40Z 56° 27' N, 2° 7' W Click for more
905573 CTD/STD cast 2007-06-10 07:05Z 56° 27' N, 1° 47' W Click for more
905585 CTD/STD cast 2007-06-10 09:10Z 56° 17' N, 1° 49' W Click for more
905597 CTD/STD cast 2007-06-10 11:05Z 56° 7' N, 1° 51' W Click for more
905604 CTD/STD cast 2007-06-10 12:55Z 56° 2' N, 2° 1' W Click for more
905616 CTD/STD cast 2007-06-11 05:55Z 56° 2' N, 1° 39' W Click for more
905628 CTD/STD cast 2007-06-11 08:10Z 56° 1' N, 1° 21' W Click for more
905641 CTD/STD cast 2007-06-11 10:05Z 56° 7' N, 1° 31' W Click for more
905653 CTD/STD cast 2007-06-11 12:20Z 56° 16' N, 1° 31' W Click for more
905665 CTD/STD cast 2007-06-11 13:50Z 56° 12' N, 1° 40' W Click for more
905677 CTD/STD cast 2007-06-12 04:45Z 56° 7' N, 2° 30' W Click for more
905689 CTD/STD cast 2007-06-12 06:35Z 56° 2' N, 2° 19' W Click for more
905690 CTD/STD cast 2007-06-12 08:25Z 56° 7' N, 2° 9' W Click for more
905708 CTD/STD cast 2007-06-12 10:15Z 56° 12' N, 2° 0' W Click for more
905721 CTD/STD cast 2007-06-12 12:20Z 56° 17' N, 2° 11' W Click for more
905733 CTD/STD cast 2007-06-12 14:03Z 56° 11' N, 2° 20' W Click for more
905745 CTD/STD cast 2007-06-13 05:40Z 56° 21' N, 2° 22' W Click for more
905757 CTD/STD cast 2007-06-13 07:45Z 56° 27' N, 2° 30' W Click for more
905769 CTD/STD cast 2007-06-13 10:45Z 56° 22' N, 1° 57' W Click for more

Project Database

No data currently held for this cruise in the BODC Project Database

References

Track Charts

No track charts currently available

Reports

Cruise Report