Cruise inventory

RV Corystes CORY 5/06

Cruise plan

Cruise Info. 
Ship name (ship code)RV Corystes (74RY)
Cruise identifierCORY 5/06
Cruise period2006-04-15 — 2006-04-21
StatusCompleted
Port of departureBelfast, United Kingdom
Port of returnBelfast, United Kingdom
PurposeFisheries
ObjectivesFinal in a series of 5 surveys in 2006 to assess the Irish Sea cod stock using the egg production method.

Main Objectives:
1. To conduct a plankton survey using a Gulf VII plankton sampler to determine the distribution and abundance of fish eggs and larvae in the Irish Sea, with particular emphasis on cod (Gadus morhua), haddock (Melanogrammus aeglifinus) and plaice (Pleuronectes platessa) eggs.
2. To remove cod-like eggs from fresh plankton samples at sea. To measure, stage and preserve these eggs in ethanol prior to species identification using a DNA technique on return to the laboratory.
3. To collect supplementary sub-surface environmental data using a self-logging package carried on the Gulf VII plankton samplers.
4. To collect surface water samples for analysis of nutrients, chlorophyll and phytoplankton species identification.

Narrative:
A full grid of 112 stations was completed.
Chief scientistSteven Beggs (Agri-Food and Biosciences Institute)
ProjectMH003, Irish Sea cod assessments by egg production
Coordinating bodyCEFAS
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
SpecificIrish Sea
Track chartsRV Corystes CORY 5/06 cruise track — cry5_06trk.pdf (00 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Description: Continuous recording of surface salinity and temperature via Seabird CTD
Water bottle stationsQuantity: number of stations = 30
Description: Samples of surface sea water collected during selected tows. Analysed ashore for conductivity to compare with Valeport CTD measurements.
CTD stationsQuantity: number of stations = 112
Description: CTD profiles recorded during plankton hauls by a Valeport CTD unit mounted on top of the sampler.
Chemical oceanography 
PhosphateQuantity: number of stations = 112
Description: Surface water samples collected at each station for later analysis ashore
NitrateQuantity: number of stations = 112
Description: Surface water samples collected at each station for later analysis ashore
NitriteQuantity: number of stations = 112
Description: Surface water samples collected at each station for later analysis ashore
AmmoniaQuantity: number of stations = 112
Description: Surface water samples collected at each station for later analysis ashore
SilicateQuantity: number of stations = 112
Description: Surface water samples collected at each station for later analysis ashore
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 112
Description: Samples of surface sea water filtered at every station, then preserved by freezing, for subsequent analysis ashore of chlorophyll pigments
PhytoplanktonQuantity: number of stations = 38
Description: Samples of surface sea water collected at selected stations (every third), fixed using Lugols iodine, for subsequent analysis of phytoplankton species ashore
ZooplanktonQuantity: number of stations = 112
Description: Samples collected using a fine-mesh (80 micro meter) ancillary net attached to the Gulf VII plankton sampler and towed from surface to near bottom in 'V' shaped profile. Zooplankton preserved in formalin for future analysis.
Eggs and larvaeQuantity: number of stations = 112
Description: Samples collected using Gulf VII plankton sampler, towed from surface to near bottom in 'V' shaped profile. Eggs and larvae collected in 270 micro metre mesh net. Cod-like eggs picked out and preserved in ethanol for species identification using genetic analysis. Remainder of sample preserved in formalin for identification and enumeration ashore.