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FRV Clupea 0900C

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier0900C
Cruise period2000-06-13 — 2000-07-03
StatusCompleted
Port of departureFraserburgh, United Kingdom
Port of returnFraserburgh, United Kingdom
Objectives1) To carry out an acoustic survey to determine the biomass and distribution of pelagic fish in an area off the Firth of Forth, which included the Wee Bankie and Marr Bank. Species composition and length frequency distributions of fish present in the major marks detected during the acoustic survey to be determined by pelagic trawling. Population age structure of the pelagic fish to be determind through otolith analysis.
2) To assess the abundance and distribution of seabirds in the area using standard transect census techniques. The location of all marine mammals observed at sea during this transect survey to be recorded.
3) To map seabird sediment type using the acoustic system RoxAnn.
4) To determine spatial variation in the water temperature and salinity profile within the study area by CTD dips.
5) To carry out a bottom trawl survey to determine the abundance, distribution, length composition and length-weight relationships of piscivorous demersal fish species in the study area. Spatial variation in fish condition to be examined and compared with previous cruises. Spatial variaiton in their diet and food consumption rates to be determined from analyssis of stomach samples taken from length-stratified sub-samples of each catch. Age structure of the piscivorous demersal fish populations to be determined by otolith analysis.
6) To carry out a night-time grab survey, over sediments previously determined as suitable sandeel habitat, to assess sandeel abundance and distribution. The sediment samples collected during this survey will be used to assess the RoxAnn derived sandeel habitat map.
Chief scientistSimon Greenstreet (Fisheries Research Services Aberdeen Marine Laboratory)
Cruise reportFRV Clupea 0900C cruise report cl9_00.pdf (0.21 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificFirth of Forth, Wee Bankie and Marr Bank
Track chartsFRV Clupea 0900C cruise track — trk4512a.html FRV Clupea 0900C cruise track — trk4512b.html
Measurements 
Physical oceanography 
BathythermographQuantity: number of profiles = 57
Description: CTD and XBT deployments
CTD stationsQuantity: number of stations = 14
Description: Stonehaven transect CTD and plankton sampling
CTD stationsQuantity: number of profiles = 57
Description: CTD and XBT deployments
Chemical oceanography 
PhosphateQuantity: number of stations = 14
Description: Nutrient stations
NitrateQuantity: number of stations = 14
Description: Nutrient stations
AmmoniaQuantity: number of stations = 14
Description: Nutrient stations
SilicateQuantity: number of stations = 14
Description: Nutrient stations
Biology and fisheries 
PhytoplanktonQuantity: number of stations = 14
Description: Stonehaven transect CTD and plankton sampling
ZooplanktonQuantity: number of stations = 14
Description: Stonehaven transect CTD and plankton sampling
BirdsDescription: Seabirds and Marine mammals surveyed using standard transect census techniques
Mammals and reptilesDescription: Seabirds and Marine mammals surveyed using standard transect census techniques
Pelagic fishDescription: Plelagic trawls using young Gadoid trawl (PT154) with a 6mm cod-end
Pelagic fishDescription: Acoustic survey of pelagic fish
Demersal fishDescription: Demersal trawls using a Jackson Rockhopper Trawl (BT158) with a 10mm cod-end
Acoustic reflection on marine organisms.Description: Acoustic survey of pelagic fish
Geology and geophysics 
GrabQuantity: number of samples = 313
Description: Grab samples