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BODC Cruise Metadata Report for FRV Alba Na Mara (74NM) cruise 0412A

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 0412A
Short name 0412A
Objectives and Narrative Objectives

1. To sample sandeel larvae at sites off the east-coast of Scotland and within the Wee Bankie/Marr Bank study area. Samples will be collected using a dual bongo net in a series of 15 minute double oblique tows. These samples will be aged and have their otolith microchemistry analysed in the laboratory later.

2. 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.

3. To sample 0 group sandeels at each visited dredge station by means of random drift Day grab survey.

4. To undertake an acoustic survey of clupeid fish (and sandeels if present) in the water column using 38 and 120 kHz signals. The acoustic survey will be undertaken in the Firth of Forth and off St. Andrews Bay and along the return east-coast route to Fraserburgh. Concentrations of fish will be sampled using the pelagic trawl.

5. To conduct a RoxAnn survey of substrate type along all acoustic survey tracks.

6. To sample opportunistically the variation in water temperature and salinity in the water column using a Seabird CTD sampler.

Procedure

Scientific equipment will be loaded onto Alba na Mara on 12 March 2012.

Scientists will join the vessel at approximately 1000 on the morning of Thursday 15 March. The vessel will remain in Fraserburgh through the day-time period to switch to a night-time working mode, working between 1800 and 0600 (all times are UTC). Passage will be made at 1800 for the study site visiting pre-determined stations for sandeel larvae en route. The majority of each larval sample will be stored in ethanol, with a small subsample frozen, to allow their otoliths to be analysed later. On arrival at the study site, the vessel will commence the dredge/grab sampling programme on the evening of Friday 16 March. During the next three nights Alba na Mara will sample as many of the dredge stations on the Wee Bankie, Marr Bank, Berwick's Bank, and St Andrew's Bay 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 the dredge station before the wind three to five times, deploying the Day grab repeatedly. Between 50 and 80 adequate grab samples will be collected at each station. All sandeels collected will be weighed, measured, have their otoliths extracted, and then frozen and retained for subsequent analysis in the laboratory. Further larval samples may be collected opportunistically at this time using the bongo net.

The vessel will return to Montrose early in the morning of 19 March. Scientific staff changes and a reversion to a day-time working mode will take place at this time. The vessel will then leave Montrose as early as is possible on 20 March to begin the acoustic survey. The acoustic survey will continue over the next two days. While undertaking acoustic survey, the vessel will start work at 0600 and finish at 1800. Larval samples will again be collected opportunistically at this time. 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 should be sufficient time to fish once on route south to the main study area, and two to three times each of the following days. The CTD will be deployed each time that the vessel stops to fish.

Work will cease on the evening of
Ship FRV Alba Na Mara
Departure Port Fraserburgh, United Kingdom
Departure Date 2012-03-15
Arrival Port Fraserburgh, United Kingdom
Arrival Date 2012-03-24
Principal Scientist(s) Philip Boulcott (Marine Scotland Aberdeen Marine Laboratory)
Responsible Organisation LODYC
Associated Project(s) ST007
IHB Sea Areas Visited North Sea
Marsden Squares Visited 181;3
Work Area Description Wee Bankie, Marr Bank, Berwick?s Bank and St Andrew?s Bay, 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

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
14 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  
1176618 CTD/STD cast 2012-03-16 21:42Z 56° 13' N, 2° 3' W Click for more
1176631 CTD/STD cast 2012-03-16 22:47Z 56° 13' N, 2° 2' W Click for more
1176643 CTD/STD cast 2012-03-16 23:45Z 56° 15' N, 2° 1' W Click for more
1176655 CTD/STD cast 2012-03-17 18:18Z 56° 22' N, 1° 40' W Click for more
1176667 CTD/STD cast 2012-03-21 06:40Z 56° 4' N, 2° 53' W Click for more
1176679 CTD/STD cast 2012-03-21 10:21Z 56° 4' N, 2° 36' W Click for more
1176680 CTD/STD cast 2012-03-21 14:56Z 56° 4' N, 2° 15' W Click for more
1176692 CTD/STD cast 2012-03-21 17:30Z 56° 8' N, 2° 35' W Click for more
1176711 CTD/STD cast 2012-03-22 06:17Z 56° 12' N, 2° 34' W Click for more
1176723 CTD/STD cast 2012-03-22 08:45Z 56° 15' N, 2° 15' W Click for more
1176735 CTD/STD cast 2012-03-22 12:19Z 56° 22' N, 2° 37' W Click for more
1176747 CTD/STD cast 2012-03-22 14:22Z 56° 20' N, 2° 16' W Click for more
1176759 CTD/STD cast 2012-03-22 15:51Z 56° 25' N, 2° 28' W Click for more
1176760 CTD/STD cast 2012-03-22 17:01Z 56° 27' N, 2° 33' 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