RV Corella 15/81

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corella (74CX)
Cruise identifier15/81
Cruise period1981-12-01 — 1981-12-15
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. To carry out an acoustic survey for sprat within the western Channel between about 2-4ºW, offshore to 50ºN, concentrating on Lyme Bay.
2. To sample and identify any major pelagic shoal concentrations with a mid-water trawl and plot their distributions in finer detail.
3. To run a series of repeat surveys over the main areas of sprat concentration to estimate repeatability errors, particuarly day/night comparisons.
4. To carry out an in situ target strength measurements on sprat using the narrow beam transducer.
Chief scientistP O Johnson (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corella 15/81 cruise report corella15_81.pdf (0.16 MB) 
Ocean/sea areas 
GeneralEnglish Channel
SpecificW. Channel (Lyme Bay)
Track chartsRV Corella 15/81 cruise track — trk2682.html
Physical oceanography 
Surface measurements underway (T,S)
CTD stationsDescription: Guildluine CTD system run throughout the survey.
Biology and fisheries 
Pelagic fishQuantity: number of hauls = 14
Description: hauls made with the pelagic Engel Trawl.
Acoustic reflection on marine organisms.
Gear researchDescription: SIMRAD QD integrator was tested during this cruise