FRV Explorer 5/83

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier5/83
Cruise period1983-05-20 — 1983-06-08
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
Objectives1. To carry out a bottom trawling survey in the northern North Sea and to the north of Scotland to determine the prevalence of various pathological conditions and parasites in gadoids and flatfish.
2. To sample gadoids close to and remote from oil fields for oil degrading enzyme analysis.
3. To take bottom grab samples at one position on the Fladen ground.
4. 5 grab samples of flatfish from the Fladen ground were taken for a visiting scientist from the University of Hamburg
5. Parasite samples from various species of fish were taken for ecological and taxonomic studies

''Explorer'' arrived in Bergen on the 27/05/1983 for a half-landing but had to leave the same day due to administrative problems. Engine problems required docking at Lerwick from the 30/05/1983 until the 01/06/1983, and again at Kirkwall from the 02/06/1983 until the 04/06/1983
Chief scientistA H McVicar (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 5/83 cruise report explorer5_83.pdf (0.12 MB) 
Ocean/sea areas 
GeneralNorth Sea
Norwegian Sea
North East Atlantic Ocean (limit 40W)
SpecificN. North Sea/ North of Scotland, Firth of Forth, Bergen, Fladen grounds
Track chartsFRV Explorer 5/83 cruise track — trk2984.html
Biology and fisheries 
Demersal fishQuantity: number of stations = 47
Description: Trawling for pathology,parasitology studies. Haddock were examined for Ichthyophonus with samples of kidney being removed for microscopic examination. The flesh was examined for gross signs of disease. Examinations for Lernaeocera, pseudo branch and vertebral anomalies were done. 521 cod were examined for psuedobranch tumours, papules and ulcers. The level of Diceldophera infection was determined in 3066 whiting. Flatfish were examined for skin conditions and samples of liver were taken for oil degrading enzyme analysis and Ichthyophonus examination.
Geology and geophysics 
GrabQuantity: number of stations = 1