RV Dana 1497H
Cruise summary report
|Ship name (ship code)||RV Dana (26D4)|
|Cruise period||1997-04-21 — 1997-04-30|
|Port of departure||Aberdeen, United Kingdom|
|Objectives||1. To carry out an echo-integrator survey to determine the biomass and distribution of pelagic fish in an area off the Firth of Forth. This survey to be carried out during daylight hours when sandeels are most likely to have emerged from the seabed. Trawling to be carried out in areas with high densities of pelagic fish in order to determine fish species, size and age composition and weight-length relationships of the pelagic fish species and their main fish predators.
2. To map seabed sediment type using the acoustic system RoxAnn. Sediment samples to be collected by Box Corer from areas of varying sediment type, as determined by RoxAnn, so as to "groundtruth" the RoxAnn data. A video camera system to be deployed at each Box Core station in order to determine sediment macro-structure over a larger seabed region.
3. To sample sandeels buried in the sediment using a modified scallop dredge from a range of different sediment habitats and over a range of water depths. This sampling to be carried out at night when sandeels are usually absent from the water column.
4. To collect meteorological data, sea surface salinity, temperature and phytoplankton load, and water current velocity and direction at various depths continuously during the course of the cruise. To collect information on water temperature and salinity profiles at regular intervals throughout the cruise.
[Cruise report not entire and hence it is unknown whether all objectives were fulfilled and a complete set of measurements taken]
|Chief scientist||Simon Greenstreet (Fisheries Research Services Aberdeen Marine Laboratory)|
|Cruise report||(0.07 MB)|
|Specific||Firth of Forth|
|Track charts||(00 MB)|
|Biology and fisheries|
|Demersal fish||Quantity: number of stations = 16|
|Acoustic reflection on marine organisms.|