FRV Scotia 12/83

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Scotia (749S)
Cruise identifier12/83
Cruise period1983-11-09 — 1983-11-28
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
Objectives1. To carry out a dual frequency (39kHz and 120 kHz) echointegration and midwater trawling survey of herring and mackerel in the area to the north of Scotland and evaluate the use of the high frequency sounder for discriminating between herring and mackerel shoals.
2. To collect herring and mackerel pyloric caeca for parasitological investigations related to recruitment studies.
3. To collect data on individual weights of herring and certain other species for establishing length/weight relationships.
4. To collect herring ovaries for fecundity studies.
5. To collect water samples for radio-caesium monitoring.
6. Additional objectives were: (a) To collect live specimens of whiting and haddock for Laboratory studies; (b) To carry out tagging of any spurdog caught in trawls and of mackerel caught on handlines.
Chief scientistMike R Heath (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Scotia 12/83 cruise report sc12_83.pdf (0.18 MB) 
Ocean/sea areas 
GeneralNorth Sea
Inner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificNorthwest of Scotland, west of Outer Hebrides, North Minch, Fair Isle Channel, Shetland, northwestern North Sea
Track chartsFRV Scotia 12/83 cruise track — trk2979a.html FRV Scotia 12/83 cruise track — trk2979b.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 3704
Chemical oceanography 
RadioactivityDescription: water samples for radio-caesium analysis.
Biology and fisheries 
Pelagic fishQuantity: number of hauls = 22
Description: survey: distribution, biomass determination, pathology
Acoustic reflection on marine organisms.Quantity: track kilometres = 3704