RV Corystes COR6B/93
Cruise summary report
|Ship name (ship code)||RV Corystes (74RY)|
|Cruise period||1993-06-14 — 1993-07-04|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
|Objectives||1. To investigate the vertical distribution of spawning mackerel by day and by night using the Danish FOTO midwater trawl and rod and line.
2. To investigate the diurnal and vertical distribution of egg production using the Longhurst Hardy plankton sampler.
3. To estimate the rates of oocyte atresia in ovaries from captive mackerel.
4. To collect ovaries from spawning mackerel in order to estimate annual changes in the batch fecundity for Dr I Priede, Zoology Department, University of Aberdeen.
|Chief scientist||Michael Greer-Walker (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)|
|Cruise report||(0.19 MB)|
|General||North East Atlantic Ocean (limit 40W)|
|Specific||West of Ireland and SW Approaches|
|Water bottle stations||Quantity: number of stations = 48|
Description: surface salinity only
|Biology and fisheries|
|Eggs and larvae||Quantity: number of stations = 68|
Description: mackerel eggs
|Pelagic fish||Quantity: number of hauls = 58|
Description: 40 trawls made using the Danish FOTO midwater trawl and 18 with rod and line.
|Other biological/fisheries measurement||Description: Histological studies|