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FRV Alba Na Mara 1817A

Cruise plan

Cruise Info. 
Ship name (ship code)FRV Alba Na Mara (74NM)
Cruise identifier1817A
Cruise period2017-10-17 — 2017-11-03
StatusCompleted
Port of departureGreenock, United Kingdom
Port of returnGreenock, United Kingdom
PurposeResearch
ObjectivesObjectives

1. To conduct an acoustic survey designed to survey both the open and enclosed areas of the Clyde to ultimately provide an estimate of the abundance and distribution of herring and sprat
2. To obtain samples of herring and sprat for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection.
3. All other species caught will be measured for length and weight to establish a length weight relationship.
4. CTD profiles will be taken at the end of each trawl.

Procedure

Fishing gear will be transported to Greenock by lorry on 17 October and loaded onto the vessel. Scientific staff will travel by lab vehicle to join the vessel in Greenock on 19 October. The vessel will commence the survey on 20 October at the earliest opportunity.

The survey will be carried out within an area bounded by approximately 55°N to 56°N and 04° 40' W to 05° 40' W. Echointegration will be carried out at 38, 120 and 200 kHz. Data gathered in the hours of darkness will not be used for stock assessment. Trawling operations will be carried out as and when marks are identified. Otoliths will be collected from a sub-sample of the herring and sprat to determine age. The maturity state and. presence of Icthyophonus infection will also be recorded.

A CTD profile will be taken at the end of each trawl. The track will be similar to that of previous surveys. TSG data will be gathered during the survey. The survey will involve following a pre-set survey pattern, at a steaming speed of 8 knots. The vessel will berth at James Watt Dock, Greenock at the end of the survey ready for unloading on 3 November 2017. Staff will return to the laboratory on 3 November by minibus.
Chief scientistEric Armstrong (Marine Scotland Aberdeen Marine Laboratory)
Cruise programmeFRV Alba Na Mara 1817A cruise programme 1817a.pdf  (0.07 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
SpecificFirth of Clyde
Data held at BODC Get data
Series/Profiles 
14  CTD/STD cast
Reference numbers
Temperature of the water column
Salinity of the water column
Vertical spatial coordinates
Concentration of suspended particulate material in the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Reference numbers
Temperature of the water column
Salinity of the water column
Vertical spatial coordinates
Concentration of suspended particulate material in the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
19121862017-10-23 14:05 55° 38' 51" N  4° 53' 14" W  View metadata report for BODC series reference number 1912186
19121502017-10-21 16:00 55° 51' 41" N  5° 11' 30" W  View metadata report for BODC series reference number 1912150
19121742017-10-22 14:54 56° 12' 2" N  5° 5' 16" W  View metadata report for BODC series reference number 1912174
19122172017-10-26 10:11 55° 18' 47" N  5° 25' 43" W  View metadata report for BODC series reference number 1912217
19122542017-11-01 13:09 55° 41' 46" N  5° 10' 5" W  View metadata report for BODC series reference number 1912254
19122662017-11-01 15:06 55° 41' 42" N  5° 0' 37" W  View metadata report for BODC series reference number 1912266
19121982017-10-24 14:57 55° 31' 50" N  4° 57' 7" W  View metadata report for BODC series reference number 1912198
19122292017-10-29 12:22 55° 20' 40" N  5° 6' 50" W  View metadata report for BODC series reference number 1912229
19121372017-10-20 10:53 55° 50' 45" N  4° 53' 55" W  View metadata report for BODC series reference number 1912137
19121492017-10-21 09:25 55° 55' 18" N  5° 4' 14" W  View metadata report for BODC series reference number 1912149
19122302017-10-31 09:01 55° 29' 58" N  5° 22' 23" W  View metadata report for BODC series reference number 1912230
19122422017-10-31 14:14 55° 43' 23" N  5° 21' 42" W  View metadata report for BODC series reference number 1912242
19121622017-10-22 11:20 56° 2' 55" N  5° 17' 44" W  View metadata report for BODC series reference number 1912162
19122052017-10-25 13:17 55° 27' 7" N  4° 51' 5" W  View metadata report for BODC series reference number 1912205