Cruise inventory

RV Corystes COR1B/97

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corystes (74RY)
Cruise identifierCOR1B/97
Cruise period1997-01-18 — 1997-01-27
StatusCompleted
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
PurposeResearch
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: a) whether sperm production and sex steroid levels are affected by the presence of ripe spawning females; b) whether sex steroid levels are linked to body size; c) whether sex steroid levels are affected by environmental xenoestrogens. This is a continuation of studies carried out on CORYSTES 1/94 and CORYSTES 1/96.
2. Conconmitant plankton net collections of fertilised plaice eggs to assess the intensity of spawning in the sampling areas (Bromley).
3. Concomitant collection of plasma samples from male dabs.
4. Collection of pools of blood plasma from female plaice eggs (stage IV and stage V/VI to be collected separately) for mass spectrometry studies.
5. Collection of plaice pituitaries for purification of gonadotrophins. Due to damage to one of the liquid nitrogen containers, pituitaries and brains were not collected.
6. Collection of plaice brain hypothalami for possible purification of gonadotrophin-releasing hormones by Dr Sherwood of the University of Victoria in Canada. Due to damage to one of the liquid nitrogen containers, pituitaries and brains were not collected.
7. Experiments in deck tanks to determine the time course in the drop in sex steroid levels which has been found in captured male plaice.
8. Collection of live male plaice for return to the laboratory.
All aims with the exception of 5 and 6 were successfully completed.
Chief scientistAlexander Pickering Scott (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corystes COR1B/97 cruise report co1_97.pdf — access key 'C' (0.31 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificSouthern North Sea
Track chartsRV Corystes COR1B/97 cruise track — trk4215.html
Measurements 
Biology and fisheries 
Biochemical measurements (eg lipids, amino acids)Quantity: number of specimens = 570
Description: Plaice. Sex steroid levels in plasma; gonad weights
ZooplanktonQuantity: number of stations = 20
Description: Density of plaice eggs
Demersal fishQuantity: number of stations = 20
Description: Density of plaice eggs
Demersal fishQuantity: number of specimens = 570
Description: Plaice. Sex steroid levels in plasma; gonad weights