FRV Clupea 0707C
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | FRV Clupea (74CU) |
| Cruise identifier | 0707C |
| Cruise period | 2007-05-21 — 2007-05-29 |
| Status | Completed |
| Port of departure | Fraserburgh, United Kingdom |
| Port of return | Fraserburgh, United Kingdom |
| Purpose | Fisheries |
| Objectives | Objectives
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. Narrative 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 scientist | F G O'Neill (Fisheries Research Services Aberdeen Marine Laboratory) |
| Coordinating body | FRS |
| Cruise programme |  (0.02 MB) |
| Cruise report | (0.01 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Measurements | |
| 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 | |
| Phytoplankton | Quantity: number of hauls = 50 |
| Zooplankton | Quantity: number of hauls = 50 |
| Geology and geophysics | |
| Dredge | Quantity: number of hauls = 50 Description: benthic sledge |
| Grab | Description: sediment samples |
| In-situ seafloor measurement/sampling | Quantity: number of deployments = 50 Description: sample sediment plumes by water samplers and by LISST 100X instrument |
