RRS Challenger CH23A
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Challenger (74CH) |
| Cruise identifier | CH23A |
| Cruise period | 1988-01-06 — 1988-01-27 |
| Status | Completed |
| Port of departure | Aberdeen, United Kingdom |
| Port of return | Aberdeen, United Kingdom |
| Purpose | Research |
| Objectives | 1. To carry out a survey of the distribution of herring larvae, plankton and hydrographic parameters in the North Sea.
2. To perform a series of intensive studies of the vertical distribution of herring larvae. |
| Chief scientist | Mike R Heath (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
| Cruise report |  (0.12 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| CTD stations | Quantity: number of stations = 11 |
| Subsurface temperature and salinity measurements | |
| Optics (eg underwater light levels) | |
| Current profiler (eg ADCP) | Description: all trip |
| Chemical oceanography | |
| Phosphate | Quantity: number of stations = 11 |
| Nitrate | Quantity: number of stations = 11 |
| Biology and fisheries | |
| Phytoplankton | |
| Zooplankton | |
| Eggs and larvae | Description: routine sampling of herring larvae carried out using a 5 metre squared Methot-Isaacs Kidd net. |
