RV Cirolana CIR4/83

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Cirolana (74CZ)
Cruise identifierCIR4/83
Cruise period1983-03-16 — 1983-04-12
Port of departureGrimsby, United Kingdom
Port of returnGrimsby, United Kingdom
Objectives1. To conduct a plankton survey of the area to assess the abundance of mackerel eggs.
2. To sample mackerel on the spawning grounds using either bottom or midwater trawls, and to sample other groundfish from the bottom trawl.
3. To use the 2m neuston net to sample mackerel larvae at the surface.
4. To rendezvous with the FRV ANTON DOHRN and do comparative hauls between the Lowestoft 53cm samplers and the nackthai net.
5. To take surface water samples for shipboard analysis of chlorophyll 'a' and phaeophytins.
6. To test run the software package for data logging all sensors on the plankton sampler Guildline and to develop programmes as requied for data handling.
7. To obtain fertile eggs of Microchirus variegatus and to rear them at a relevant range of temperature and observe development.
Chief scientistJohn H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
ProjectMackerel Egg Survey
Coordinating bodyICES
Cruise reportRV Cirolana CIR4/83 cruise report ci4_83.pdf (0.33 MB) 
Ocean/sea areas 
GeneralBay of Biscay
North East Atlantic Ocean (limit 40W)
SpecificCeltic Sea/Biscay
Track chartsRV Cirolana CIR4/83 cruise track — trk2935.html
Physical oceanography 
Water bottle stationsQuantity: number of stations = 3
Description: 110 S surface - see MAFF Fisheries Research Data Report No 17, 1989
CTD stationsQuantity: number of stations = 110
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)
PhytoplanktonQuantity: number of stations = 110
ZooplanktonQuantity: number of stations = 110
NeustonQuantity: number of hauls = 22
Description: half hour trawls.
Pelagic fishQuantity: number of hauls = 2
Demersal fishQuantity: number of hauls = 9