Cruise inventory

FRV Clupea 0707C

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier0707C
Cruise period2007-05-21 — 2007-05-29
Port of departureFraserburgh, United Kingdom
Port of returnFraserburgh, United Kingdom

1. To collect samples of the sediment plumes behind objects towed over the sea bed using a towed sledge.
2. To test the high resolution load cell data logger.


Fifty tows were carried out using the benthic sledge at sites between Sandend and Cullen and between Burghead and Nairn in the period 21-28 May. A number of gear elements were fitted ahead of the sledge. These were a segment of rock hopper ground gear; a segment of small disc ground gear; a length of chain and a trawl door. To obtain baseline readings tows were also carried out using the sledge alone at both locations.

The sediment plumes were sampled (i) by water samplers mounted on the sledge and triggered by acoustic releases, (ii) by small plankton nets and (iii) by the LISST 100X instrument. Towing speed was measured using a self-recording flowmeter and a self recording camera recorded the triggering of the water samplers. Sediment samples were taken at each site using the day grab. The sediment plume samples were filtered, subsampled and stored on board the Clupea.
Analysis of the suspended solids, particle size and nutrient will take place at the Laboratory and comparisons will be made between the sampler bottle data, the day grab data and the LISST 100X data.
Chief scientistF G O'Neill (Fisheries Research Services Aberdeen Marine Laboratory)
Coordinating bodyFRS
Cruise programmeFRV Clupea 0707C cruise programme 0707c.pdf — access key 'C' (0.02 MB) 
Cruise reportFRV Clupea 0707C cruise report 0707c.pdf — access key 'C' (0.01 MB) 
Ocean/sea areas 
GeneralNorth Sea
Physical oceanography 
Transparency (eg transmissometer)Quantity: number of deployments = 50
Description: sample sediment plumes by water samplers and by LISST 100X instrument
Biology and fisheries 
PhytoplanktonQuantity: number of hauls = 50
ZooplanktonQuantity: number of hauls = 50
Geology and geophysics 
DredgeQuantity: number of hauls = 50
Description: benthic sledge
GrabDescription: sediment samples
In-situ seafloor measurement/samplingQuantity: number of deployments = 50
Description: sample sediment plumes by water samplers and by LISST 100X instrument