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FRV Clupea 1206C Part 2
Cruise summary report
Cruise Info. | |
Ship name (ship code) | FRV Clupea (74CU) |
Cruise identifier | 1206C Part 2 |
Cruise period | 2006-09-06 — 2006-09-15 |
Status | Completed |
Port of departure | Lochinver, United Kingdom |
Port of return | Fraserburgh, United Kingdom |
Purpose | Fisheries |
Objectives | Objectives
To conduct a 'late summer' survey of a suite of sea lochs / voes impacted to varying degrees by nutrient releases from fish farming activity. This survey forms part of an ongoing programme of work to assess the potential for eutrophication arising from nutrient 'hotspots' linked to aquaculture. This will be undertaken by measuring the following parameters at multiple stations in each loch: 1. CTD and dissolved oxygen 2. Nutrients (inc. silicates) 3. Chlorophyll a 4. Phytoplankton 5. Shoreline macroalgae 6. Organic carbon in sediments 7. Algal toxins in wild shoreline mussels, phytoplankton and water These determinands will be made available for assessment against criteria as defined by the OSPAR Eutrophication Committee and used for future eutrophication assessment of Scottish coastal waters. Data will also be compared to that collected during previous cruises and will be used to inform estimates of internal mixing within sea lochs/voes to improve laboratory models to predict nutrient enhancement from aquaculture. In addition zooplankton will be sampled by bongo net from 1-2 stations in each loch and fixed in ethanol and formalin. Sediment samples from close to fish farms will also be taken to determine the levels of metals, organic carbon and persistent organic pollutants. Surface chlorophyll a levels will be recorded by continuously recording flourometer, within a tidal excursion close to two large open water fish farms during a 12 hour tidal cycle. Narrative Clupea departed Lochinver for Shetland at 0300 on the 7 September and arrived in Scalloway at 23:30. A single CTD cast and plankton sample was taken in Scalloway harbour (a long term phytoplankton monitoring site) on the morning of the 8 September before conducting survey work with CTD and plankton sampling in Seli Voe. Similar survey work was then completed in Weisdale Voe and outer Stromness Voe. |
Chief scientist | Matt Gubbins (Fisheries Research Services Aberdeen Marine Laboratory) |
Project | AE11s-15d, AE1192-5d |
Coordinating body | FRS |
Cruise report | (0.07 MB) |
Ocean/sea areas | |
General | North Sea Inner Seas off the West Coast of Scotland North East Atlantic Ocean (limit 40W) |
Specific | North Minch & Shetland |
Measurements | |
Physical oceanography | |
Water bottle stations | Quantity: number of stations = 187 Description: CTD/rosette sampler |
CTD stations | Quantity: number of stations = 187 Description: CTD/rosette sampler |
Biology and fisheries | |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Description: surface chlorophyll over 12hr tidal cycle with fluorometer |
Phytoplankton | Quantity: number of samples = 160 Description: plankton sampling: 97 phytoplankton; 41 toxic phytoplankton; 22 zooplankton |
Phytoplankton | Quantity: number of stations = 35 Description: macroalgae |
Zooplankton | Quantity: number of samples = 160 Description: plankton sampling: 97 phytoplankton; 41 toxic phytoplankton; 22 zooplankton |
Geology and geophysics | |
Grab | Quantity: number of samples = 23 Description: Day grab, sediment, including 4 farm transects |