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BODC Cruise Metadata Report for FRV Alba Na Mara (74NM) cruise 1711A

Introduction

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

Cruise Inventory Information

Long name FRV Alba Na Mara (74NM) cruise 1711A
Short name 1711A
Objectives and Narrative Objectives

1. To undertake an acoustic survey of clupeid fish (and sandeels if present) in the water column using 38 and 120 kH. Acoustic survey will be undertaken in the Firth of Forth and off St Andrews Bay as indicated in Figure 1. Concentrations of fish will be sampled using the pelagic trawl.
2. To conduct a RoxAnn survey of the substrate along all acoustic survey track.
3. To sample 1+ aged sandeels at previously established stations on the Wee Bankie, Marr Bank, Berwick's Bank, and St Andrew's Bay using the sandeel dredge.
4. To sample 0 group sandeels at each visited dredge station by means of random drift Day grab survey.
5. To sample variation in water temperature and salinity through the water column using a Seabird CTD sampler at fishing and dredge stations and on the acoustic transect.

Procedure

Scientific equipment will be loaded onto Alba na Mara on 21 November.

The cruise will follow the following protocol:

Scientists will join the vessel at approximately 1330h on the afternoon of Wednesday 23 November to allow for an early departure time on 24 November. If conditions allow, the acoustic survey will take place over the next 3 days, covering the tracks indicated in Figure 1. Whilst undertaking acoustic survey, the vessel will start work at 0600h and finish at 1800h. Concentrations of pelagic fish will be sampled using the pelagic trawl for species composition, length-frequency distribution, weight at length and age at length analysis. Samples will be retained and frozen for subsequent sex, maturity, and condition analysis in the laboratory. It is hoped that there will be sufficient time to fish two to three times on each of the surveyed days. The CTD will be deployed each time that the vessel stops to fish. Additional CTD samples at the mouth of the Firth of Forth, St Andrews Bay, and off the acoustic tracks may also be taken, time permitting.

Once the acoustic survey is completed the vessel will berth at Rosyth Docks (provisionally, the evening of the 26 November). The vessel's routine will switch thereafter from day-time to night-time working mode, working between 1800h and 0600h. An additional member of scientific crew will join the vessel at this juncture. In the days that follow, Alba will sample as many of the dredge stations on the Wee Bankie, Marr Bank, Berwick's Bank, and St Andrew's Bay indicated in Figure 2 as is possible. The CTD will be deployed at each dredge station prior to deploying the dredge. At each station the dredge will be deployed twice. Total catch size will be determined and sub-samples examined to assess length frequency distribution, weight at length and age at length relationships. Further sub samples will be retained and frozen for subsequent sex, maturity, and condition analysis in the laboratory. Alba na Mara will then drift across sampled dredge stations before the wind between three and five times deploying the Day grab repeatedly until between 50 and 80 adequate grab samples have been collected at each station. All sandeels collected will be weighed, measured, have their otoliths extracted, and the 0-group frozen and retained for subsequent analysis in the laboratory.

Work will cease on the night of 30 November/1 December in time to allow the vessel sufficient time to be in Leith by 0600h.

Scientists will leave the vessel and scientific equipment and samples will be offloaded on Thursday 1 December.
Normal contacts will be maintained with the Marine Laboratory.
Ship FRV Alba Na Mara
Departure Port Leith, United Kingdom
Departure Date 2011-11-24
Arrival Port Leith, United Kingdom
Arrival Date 2011-12-01
Principal Scientist(s) Philip Boulcott (Marine Scotland Aberdeen Marine Laboratory)
Responsible Organisation National Science Foundation
Associated Project(s)
IHB Sea Areas Visited North Sea
Marsden Squares Visited 181;3
Work Area Description East Coast of Scotland (Wee Bankie)
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

No information on datasets is currently available for this cruise

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
8 CTD/STD cast Chlorophyll pigment concentrations in water bodies
Concentration of suspended particulate material in the water column
Density of the water column
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  
1155614 CTD/STD cast 2011-11-24 14:58Z 56° 9' N, 2° 40' W Click for more
1155626 CTD/STD cast 2011-11-25 08:24Z 56° 27' N, 2° 18' W Click for more
1155638 CTD/STD cast 2011-11-25 11:03Z 56° 22' N, 2° 36' W Click for more
1155651 CTD/STD cast 2011-11-26 08:39Z 56° 12' N, 2° 36' W Click for more
1155663 CTD/STD cast 2011-11-28 00:09Z 56° 14' N, 2° 2' W Click for more
1155675 CTD/STD cast 2011-11-28 01:09Z 56° 15' N, 2° 1' W Click for more
1155687 CTD/STD cast 2011-11-28 21:18Z 56° 14' N, 2° 3' W Click for more
1155699 CTD/STD cast 2011-11-29 19:28Z 56° 25' N, 2° 26' W Click for more

Project Database

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

References

Track Charts

Track Chart

Reports

No reports currently available