FRV Explorer 4A/68
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | FRV Explorer (74EX) |
| Cruise identifier | 4A/68 |
| Cruise period | 1968-05-12 — 1968-05-20 |
| Status | Completed |
| Port of departure | Stornoway, United Kingdom |
| Port of return | Stornoway, United Kingdom |
| Purpose | Research |
| Objectives | ''Explorer'' sailed from Aberdeen on the 10/05/1968 and arrived in Stornoway on the 11/05/1968 to land an engineer who had been carrying out tests on the log.
1) Hydrographic and Plankton sampling 2) Trawling survey 3) Intensive hydrobiological survey of a small area on the eastern edge of Rockall Bank The Technicon Anaylser was run continuously throughout the cruise to provide surface silicate data. Phytoplankton sedimentation samples were collect for Dr Gillbricht, Kiel, for comparison with chlorophyll data and with carbon-14 estimates of production |
| Chief scientist | John H Steele (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
| Cruise report |  (0.20 MB) |
| Ocean/sea areas | |
| General | North Atlantic Ocean |
| Specific | Rockall, Butt of Lewis, |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Description: T only |
| Bathythermograph | Quantity: number of profiles = 46 Description: mechanical |
| Water bottle stations | Quantity: number of stations = 27 Description: 39 T surface |
| Chemical oceanography | |
| Phosphate | Quantity: 15 Description: Technicon Anaylser was run continuously throughout the cruise to provide surface data |
| Nitrate | Quantity: 15 Description: Technicon Anaylser was run continuously throughout the cruise to provide surface data |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: 17 Description: The Turner fluorometer was run continuously for chlorophyll. |
| Phytoplankton | Quantity: 46 Description: In virto sampling carried out for calibration purposes |
| Pelagic fish | Quantity: number of hauls = 19 Description: Depths ranging from 74-240 fathoms. Blue whiting was the priniciple species caught. Silver smelts, A.silus, A. sphyraena, rabbit fish, dogfish, and Sebastes were also caught |
