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BODC Cruise Metadata Report for FRV Clupea (74CU) cruise 0806C

Introduction

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

Cruise Inventory Information

Long name FRV Clupea (74CU) cruise 0806C
Short name 0806C
Objectives and Narrative 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 kH will be used to aid species recognition. This acoustic survey will also produce abundance estimates for herring and sprats. Concentrations of fish will be sampled using the pelagic trawl. Species composition and length frequency distributions of fish caught will be determined. Sub samples will be weighed and their 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 will also produce abundance indices for herring and sprats, the two other main "prey" species as well as the major piscivorous fish predators in the area, whiting, haddock and cod. At each trawl station the length frequency of all fish species caught will be determined. Sub-samples of sandeels, herring, sprats, cod, haddock, and whiting will be weighed to determine length-weight relationships. Otoliths will be taken to determine age composition. Sub-samples of the gadoid predators will be retained and frozen for subsequent dietary analysis.

3. Simultaneously with the demersal trawl survey, a hydrographic survey will be undertaken using a Seabird 19 CTD sampler fitted with fluorometer and transmissometer to determine spatial variation in water temperature, salinity fluoroescence and turbidity across the study area. Approximately 44 vertical dip stations will be sampled. These data are required to inform the analysis of the demersal trawl and acoustic survey data to derive an overall sandeel abundance estimate.

4. Simultaneously with the acoustic survey, a survey of seabirds at sea within the study area will be undertaken using standard census methods. Protection of local breeding seabirds was one of the principal motives underpinning the sandeel fishery closure.

5. Whilst c
Ship FRV Clupea
Departure Port Fraserburgh, United Kingdom
Departure Date 2006-06-15
Arrival Port Fraserburgh, United Kingdom
Arrival Date 2006-06-28
Principal Scientist(s) Simon Greenstreet (Fisheries Research Services Aberdeen Marine Laboratory)
Responsible Organisation Fisheries Research Services Aberdeen Marine Laboratory
Associated Project(s) MFO7n
IHB Sea Areas Visited North Sea
Marsden Squares Visited 181;3
Work Area Description off Firth of Forth
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  
CTD stations Quantity: number of stations = 45
Description: Hydrographic sampling stations, work undertaken between 0400h and 1600 BST. A grid of hydrographic stations, utilising the demersal trawl stations along with additional stations, was sampled. At each station CTD deployed. The hydrogrpahic stations in the hydro transect were re-sampled to assess changes in hydrographic conditions over the course of the cruise. Water samples were collected at a hydro transect of stations for subsequent chlorophyll analysis to calibrate the flurometer.  
Biology and fisheries  
Acoustic reflection on marine organisms. Quantity: activity duration in days = 3
Description: Acoustic survey. Work conducted between 0400h and 1500 BST when sandeels were most likely to be active in the water column. Acoustic data integrated over 5 minute periods. RoxAnn data were routinely collected throughout the entire duration of the acoustic survey including additional track between transects and whilst steaming to and from anchorages.  
Birds Quantity: activity duration in days = 3
Description: Sea bird survey. Work conducted between 0400h and 1500 BST. Data were aggregated over the same 5 minute periods of acoustic integration to allow direct comparison of predator abundance and prey density.  
Demersal fish Quantity: number of stations = 19
Description: Demersal trawl stations, work undertaken between 0400h and 1600 BST. At each station A Jackson Rockhopper demersal trawl gear (BT158) with 10mm codend mesh was deployed. The total numbers at length of all species in the catch was determined. Samples of herring, sprats and sandeels were weighed to determine length-weight relationships and otoliths were collected to determine age at length keys. Samples of whiting and haddock were retained and frozen for dietary analysis at the laboratory  
Mammals and reptiles Quantity: number of observations = 8
Description: Grey seal sightings. The numbers, identity and locations of all marine mammals observed at sea recorded.  

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
53 CTD/STD cast Chlorophyll pigment concentrations in water bodies
Density of the water column
Electrical conductivity of the water column
Salinity of the water column
Temperature of the water column
Transmittance and attenuance 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  
722783 CTD/STD cast 2006-06-20 06:45Z 56° 17' N, 1° 40' W Click for more
722795 CTD/STD cast 2006-06-20 07:45Z 56° 17' N, 1° 46' W Click for more
722802 CTD/STD cast 2006-06-20 09:05Z 56° 17' N, 2° 0' W Click for more
722814 CTD/STD cast 2006-06-20 09:55Z 56° 17' N, 2° 9' W Click for more
722826 CTD/STD cast 2006-06-20 10:42Z 56° 17' N, 2° 19' W Click for more
722838 CTD/STD cast 2006-06-20 11:30Z 56° 17' N, 2° 30' W Click for more
722851 CTD/STD cast 2006-06-20 12:55Z 56° 7' N, 2° 39' W Click for more
722863 CTD/STD cast 2006-06-22 05:40Z 56° 7' N, 2° 40' W Click for more
722875 CTD/STD cast 2006-06-22 07:15Z 56° 7' N, 2° 30' W Click for more
722887 CTD/STD cast 2006-06-22 09:05Z 56° 2' N, 2° 30' W Click for more
722899 CTD/STD cast 2006-06-22 09:30Z 56° 2' N, 2° 18' W Click for more
722906 CTD/STD cast 2006-06-22 10:00Z 56° 2' N, 2° 10' W Click for more
722918 CTD/STD cast 2006-06-22 11:30Z 56° 8' N, 2° 8' W Click for more
722931 CTD/STD cast 2006-06-22 12:05Z 56° 7' N, 2° 0' W Click for more
722943 CTD/STD cast 2006-06-22 13:35Z 56° 1' N, 2° 2' W Click for more
722955 CTD/STD cast 2006-06-23 05:40Z 56° 2' N, 1° 39' W Click for more
722967 CTD/STD cast 2006-06-23 06:28Z 56° 2' N, 1° 30' W Click for more
722979 CTD/STD cast 2006-06-23 07:50Z 56° 1' N, 1° 20' W Click for more
722980 CTD/STD cast 2006-06-23 08:30Z 56° 7' N, 1° 19' W Click for more
722992 CTD/STD cast 2006-06-23 10:00Z 56° 6' N, 1° 31' W Click for more
723006 CTD/STD cast 2006-06-23 10:45Z 56° 12' N, 1° 30' W Click for more
723018 CTD/STD cast 2006-06-23 12:20Z 56° 10' N, 1° 40' W Click for more
723031 CTD/STD cast 2006-06-23 12:51Z 56° 7' N, 1° 40' W Click for more
723043 CTD/STD cast 2006-06-23 13:44Z 56° 2' N, 1° 49' W Click for more
723055 CTD/STD cast 2006-06-24 05:41Z 56° 9' N, 1° 51' W Click for more
723067 CTD/STD cast 2006-06-24 06:08Z 56° 12' N, 1° 49' W Click for more
723079 CTD/STD cast 2006-06-24 07:36Z 56° 18' N, 1° 46' W Click for more
723080 CTD/STD cast 2006-06-24 08:06Z 56° 17' N, 1° 40' W Click for more
723092 CTD/STD cast 2006-06-24 09:29Z 56° 16' N, 1° 31' W Click for more
723111 CTD/STD cast 2006-06-24 10:22Z 56° 22' N, 1° 40' W Click for more
723123 CTD/STD cast 2006-06-24 11:00Z 56° 27' N, 1° 40' W Click for more
723135 CTD/STD cast 2006-06-24 12:20Z 56° 27' N, 1° 48' W Click for more
723147 CTD/STD cast 2006-06-25 03:45Z 56° 25' N, 2° 36' W Click for more
723159 CTD/STD cast 2006-06-25 05:04Z 56° 27' N, 2° 28' W Click for more
723160 CTD/STD cast 2006-06-25 05:35Z 56° 27' N, 2° 19' W Click for more
723172 CTD/STD cast 2006-06-25 07:17Z 56° 27' N, 2° 6' W Click for more
723184 CTD/STD cast 2006-06-25 07:45Z 56° 27' N, 2° 0' W Click for more
723196 CTD/STD cast 2006-06-25 08:45Z 56° 22' N, 1° 49' W Click for more
723203 CTD/STD cast 2006-06-25 10:08Z 56° 22' N, 2° 0' W Click for more
723215 CTD/STD cast 2006-06-25 10:45Z 56° 22' N, 2° 10' W Click for more
723227 CTD/STD cast 2006-06-25 12:22Z 56° 21' N, 2° 24' W Click for more
723239 CTD/STD cast 2006-06-25 12:45Z 56° 22' N, 2° 30' W Click for more
723240 CTD/STD cast 2006-06-25 13:20Z 56° 17' N, 2° 30' W Click for more
723252 CTD/STD cast 2006-06-25 13:56Z 56° 12' N, 2° 30' W Click for more
723264 CTD/STD cast 2006-06-26 04:58Z 56° 13' N, 2° 20' W Click for more
723276 CTD/STD cast 2006-06-26 05:36Z 56° 7' N, 2° 19' W Click for more
723288 CTD/STD cast 2006-06-26 06:35Z 56° 12' N, 2° 10' W Click for more
723307 CTD/STD cast 2006-06-26 08:09Z 56° 12' N, 1° 57' W Click for more
723319 CTD/STD cast 2006-06-26 08:40Z 56° 12' N, 1° 50' W Click for more
723320 CTD/STD cast 2006-06-26 09:30Z 56° 12' N, 1° 40' W Click for more
723332 CTD/STD cast 2006-06-26 10:45Z 56° 17' N, 2° 0' W Click for more
723344 CTD/STD cast 2006-06-26 12:43Z 56° 17' N, 2° 13' W Click for more
723356 CTD/STD cast 2006-06-26 13:15Z 56° 17' N, 2° 20' 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