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FRV Clupea 1003C_1

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier1003C_1
Cruise period2003-06-05 — 2003-06-18
StatusCompleted
Port of departureFraserburgh, United Kingdom
Port of returnMontrose, United Kingdom
PurposeResearch
Objectives1. To investigate variation in sandeel population age structure at different locations on the Wee Bankie and Marr Bank from samples collected using the Sandeel dredge.
2. To carry out a demersal trawl survey to determine the abundance and distribution of whiting, haddock and cod, the main fish predators of sandeels. At each trawl station the length frequency of all fish species caught will be determined. Sub-samples of the three gadoids will be weighed to determine length-weight relationships. Otoliths will be taken to determine age composition. Stomach samples will be collected to establish diet and food consumption rates, and livers and gonads will be removed to determine Hepato- and Gonado- Somatic Indices. (Any sandeels and clupeid fish caught during the demersal trawling will be worked up to determine length frequency distributions, length-weight relationships and age composition). Muscle tissue samples will also be collected for fatty acid and nitrogen isotope ratio analysis.
3. To determine spatial variation in water temperature and salinity across the Wee Bankie/Marr Bank study area using a Seabird CTD sampler. Approximately 44 vertical dip stations will be sampled utilising the demersal trawl stations and additional locations mid-way between the trawl stations.
4. To undertake an acoustic survey of sandeels and clupeid fish in the water column using 38 and 120 kH. 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.
5. To conduct a RoxAnn survey of the substrate in the study area to investigate variation in the sandbank structure between this and previous cruises.
6. To conduct a survey of seabirds using the study area, to determine their abundance and distribution, using standard census methods.
7. To record all sightings of marine mammals (number of animals, species if possible, and their location) observed during the course of the cruise.
8. To conduct a hydrographic survey along a transect offshore of Stonehaven. At pre-selected locations the Seabird CTD sampler and the dual Bongo net will be deployed using a vertical dip. Water samples will be collected for salinity, nutrient and phytoplankton analysis. The 1 m plankton net will be deployed using a double oblique tow between selected stations along the transect.
Chief scientistSimon Greenstreet (Fisheries Research Services Aberdeen Marine Laboratory)
Cruise reportFRV Clupea 1003C_1 cruise report 1003c.pdf (0.25 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificWee Bankie/Marr Bank Firth of Forth
Track chartsFRV Clupea 1003C_1 cruise track — 1003ctrack.pdf (0.12 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of samples = 6
Description: Water bottles were used to collected nutrient samples along the Stonehaven Transect
CTD stationsQuantity: number of stations = 73
Description: CTD stations were located across the Firth of Forth
Chemical oceanography 
PhosphateQuantity: number of samples = 6
Description: Phosphates were collected along the Stonehaven Transect
NitrateQuantity: number of samples = 6
Description: Nitrates were collected along the Stonehaven Transect
SilicateQuantity: number of samples = 6
Description: Silicates were collected along the Stonehaven Transect
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 40
Description: Chlorophyll samples collected on most CTD dips
PhytoplanktonQuantity: number of hauls = 6
Description: Phytoplankton collected with Bongo Nets/Integrated plankton sampler
ZooplanktonQuantity: number of hauls = 6
Description: Zooplankton collected with Bongo Nets/Integrated plankton sampler
BirdsQuantity: number of surveys = 1
Description: A seabird survey was carried out along the line of the acoustic transect in the Forth
Pelagic fishQuantity: number of hauls = 7
Description: Pelagic fish were sampled in the Firth of Forth
Demersal fishQuantity: number of hauls = 19
Description: Demersal fish were sampled in the Firth of Forth
Acoustic reflection on marine organisms.Quantity: number of surveys = 1
Description: An acoustic survey was carried out in the Firth of Forth