Cruise inventory

RV Celtic Voyager CV0603

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Celtic Voyager (45CV)
Cruise identifierCV0603
Cruise period2006-03-07 — 2006-03-15
StatusCompleted
Port of departureBelfast, United Kingdom
Port of returnDublin, Ireland
PurposeFisheries
ObjectivesThird 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:
It was aimed to complete a standard grid of 112 stations. However, due to unfavourable weather conditions, samples were collected at 81 of these stations during the survey period.
Chief scientistStephen Paul Milligan (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)
ProjectMH003, Irish Sea cod assessments by egg production
Coordinating bodyCEFAS
Cruise reportRV Celtic Voyager CV0603 cruise report celticvoyager3_06.pdf — access key 'C' (0.12 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
SpecificIrish Sea
Track chartsRV Celtic Voyager CV0603 cruise track — celticvoyager3_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 = 27
Description: Samples of surface sea water collected during selected tows. Analysed ashore in order to compare with / validate Valeport CTD values.
CTD stationsQuantity: number of stations = 81
Description: CTD profiles recorded during plankton hauls by a Valeport CTD unit mounted on top of the sampler.
Chemical oceanography 
PhosphateQuantity: number of stations = 81
Description: Surface water samples collected at each station for later analysis ashore
NitrateQuantity: number of stations = 81
Description: Surface water samples collected at each station for later analysis ashore
NitriteQuantity: number of stations = 81
Description: Surface water samples collected at each station for later analysis ashore
AmmoniaQuantity: number of stations = 81
Description: Surface water samples collected at each station for later analysis ashore
SilicateQuantity: number of stations = 81
Description: Surface water samples collected at each station for later analysis ashore
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 81
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 = 27
Description: Samples of surface sea water collected at selected stations, fixed using Lugols iodine, for subsequent analysis of phytoplankton species ashore
Eggs and larvaeQuantity: number of stations = 81
Description: Samples collected using Gulf VII plankton sampler, towed from surface to near bottom in 'V' shaped profile. Eggs and larvae collected in 270µm 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.