Planned maintenance — 18th January 2018 12:00 to 22nd January 2018 09:00 [more]

Cruise inventory

RV Corystes COR1/96

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corystes (74RY)
Cruise identifierCOR1/96
Cruise period1996-01-03 — 1996-01-12
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. Collection of blood, sperm and testis samples from male plaice caught on and off the main spawning areas of the North Sea - to determine the extent to which sperm production and sex steroid levels are affected by the presence of ripe spawning females. This is a continuation of studies which were started on CORYSTES 1/94.
2. Concomitant plankton net collections of fertilised plaice eggs to assess the intensity of spawning in the sampling areas (Bromley).
3. Collection and preservation of plaice ovaries in formalin (for subsequent sizing and counting on the HLAC) and Chan's fixative (for staging the oocytes).
4. Collection of plaice pituitaries for purification of gonadotrophins.
5. Collection of plaice brain hypothalami for possible purification of Gonadotrophin-releasing hormones by Dr Sherwood of the University of Victoria in Canada.
6. Collection of plasma from spawning female flounders for steroid identification by Dr Jan Lambert of the University of Utrecht. No flounders were caught at any of the stations, therefore making this aim impossible to achieve.
7. Experiments in the deck tanks to determine the time course in the drop in sex steroid levels which has been found in captured male plaice (Vermeirssen).
8. In vitro incubations of plaice oocytes to test the effectiveness of '17,20b-P'-like steroids in triggering final oocyte maturation (Scott). Due to bad weather and pressure to achieve some of the other more major aims, no in vitro incubations were carried out.
9. Collection of live male plaice for return to the laboratory.
Chief scientistAlexander Pickering Scott (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corystes COR1/96 cruise report co1_96.pdf — access key 'C' (0.24 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificSouthern North Sea
Track chartsRV Corystes COR1/96 cruise track — trk4226.html
Biology and fisheries 
Demersal fishQuantity: number of specimens = 65
Description: Plaice for analysis of weight,length,testis,blood hormones