FRV Explorer 9/74
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | FRV Explorer (74EX) |
| Cruise identifier | 9/74 |
| Cruise period | 1974-10-09 — 1974-10-23 |
| Status | Completed |
| Port of departure | Aberdeen, United Kingdom |
| Port of return | Aberdeen, United Kingdom |
| Purpose | Research |
| Objectives | 1) To undertake a pre-recruit survey of the North Sea fish stocks.
2) Stomachs from selected cod and haddock were brought back for examination 3) Blood smears of cod were collected for Plymouth Polytechnic from various stations in the North Sea 4) Samples of young gadoids from the northern North Sea were preserved for examination for larval nematodes 5) Organisms were collected from the visceral cavities of skate and preserved for future use 6) 0+ group herring were preserved in Bouin's Fluid for histological examination of skin in connection with a biological tag project Problems with the ship's main generator delayed sailing till the 09/10/1974 and forced an early return |
| Chief scientist | Norman T Nicoll (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
| Cruise report |  (0.08 MB) |
| Ocean/sea areas | |
| General | North Sea Norwegian Sea North East Atlantic Ocean (limit 40W) |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: number of hauls = 34 Description: Taken with the Dutch Gulf III high-speed sampler |
| Water bottle stations | Quantity: number of hauls = 34 Description: Taken with the Dutch Gulf III high-speed sampler |
| Subsurface temperature and salinity measurements | Quantity: number of hauls = 34 Description: Taken with the Dutch Gulf III high-speed sampler |
| Biology and fisheries | |
| Primary productivity | Quantity: number of hauls = 33 Description: 1 hour duration. |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Description: chlorophyll from the pumped non-toxic seawater supply, taken with the Dutch Gulf III high-speed sampler for dry weight determination |
| Particulate organic matter (inc POC, PON) | Quantity: number of samples = 11 Description: carbon from the pumped non-toxic seawater supply taken with the Dutch Gulf III high-speed sampler for dry weight determination |
| Phytoplankton | Quantity: number of samples = 14 Description: Obtained from standard net hauls for dry weight determination |
| Zooplankton | Quantity: 14 Description: taken with the Dutch Gulf III high-speed sampler for dry weight determination |
| Demersal fish | Quantity: number of hauls = 33 Description: 1 hour duration made with the 48 ft Aberdeen trawl fitted with a small mesh cover. A codend mesh size of 74.4 mm.. Haddock and whiting were caught |
