FRV Explorer 5/82

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier5/82
Cruise period1982-05-28 — 1982-06-10
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
ObjectivesTo carry out a bottom trawling survey in the northern North Sea and to the north of Scotland to :-
1. Determine the effect and distribution of infection of the fungal parasite Ichthyophonus in haddock and plaice.
2. Determine the effect and distribution of infection of the copepod parasite Lernaeocera.
3. Determine the prevalence and distribution of skin and fin lesions in gadoids and flatfish.
4. Parasites and other samples from various species of fish were taken from all hauls for ecological and taxonomic studies
5. A water sample for radio-caesium monitoring was collected near Fair Isle

''Explorer'' was forced to dock in Aberdeen on the 30/05/1982 until the 04/06/1982 due to mechanical and engine problems.
Chief scientistA H McVicar (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 5/82 cruise report explorer5_82.pdf (0.09 MB) 
Ocean/sea areas 
GeneralNorth Sea
North East Atlantic Ocean (limit 40W)
SpecificN. North Sea/ N. Scotland, St. Abbs Head, Forth-Tay area, SE of Fair Isle, Moray Firth
Track chartsFRV Explorer 5/82 cruise track — trk2868.html
Chemical oceanography 
RadioactivityQuantity: number of stations = 1
Description: radio-caesium monitoring sample from 59 30'n,002 00'W
Biology and fisheries 
Demersal fishQuantity: number of hauls = 24
Description: distribution,pathology. 1184 haddock sampled for Ichthyophonus, samples of kidney being removed from all for microscopic examination. Gills were examined for Lernaeocera. Gel diffusion antibody tests were carried out on blodd serum of 50 haddock. Kidneys from 345 plaice were similarly sampled and serum of 131 tested for anibodies. 3 dorsal and ventral surfaces of 2562 common dab, 451 lemon sole and 345 plaice were examined for lymphocystis, skin papillomas, ulcerations and fit rot. 330 cod and 1184 haddock tested for psuedobranchial tumours and skin lesions. Haddock were tested for the evidence of vertebral abnormality