Cruise inventory

Bjarni Saemundsson B4-2013

Cruise summary report

Cruise Info. 
Ship name (ship code)Bjarni Saemundsson (46BS)
Cruise identifierB4-2013
Cruise period2013-06-10 — 2013-06-26
StatusCompleted
Port of departureReykjavík, Iceland
Port of returnReykjavík, Iceland
PurposeResearch
ObjectivesObjectives
The MRI sampling undertaken on board the RV Bjarni Sæmundsson will provide egg data in the area between 59°45´ N to 63°45´ N and 0°15´ W to 22°15´ W during period 5. Also, pelagic hauls were carried out to collect adult mackerel samples to estimate fecundity. These data will be combined to provide a fisheries-independent estimate of the spawning stock biomass of western mackerel and horse mackerel.

Methods
The sampling of the fish eggs was carried out with "Bongo 60" plankton sampler with a 280 micron mesh sized net and an opening diameter of 60 cm. The amount of water filtered during each haul was measured using a calibrated mechanical flow meter mounted in the opening of the net. The Bongo sampler was deployed on double oblique hauls to maximum depth of 200 m or to within 5 m of the bottom in shallower water. On every station temperature and salinity data were collected with a CTD applied from 0-50 m. Additionally a DST-tag was attached to the Bongo registering temperature and salinity profiles. On the way to the area to be surveyed, additional plankton stations were taken along the transect 62°45´ N. Due to the findings there, the investigation area was expanded further northwest. 2/3 of the plankton samples were sorted for fish eggs during the survey, using the spray method and mackerel eggs were staged according the sampling protocol while 1/3 of the samples were processed in the laboratory after the cruise. For quality assurance sorting of the samples was checked after the survey.
In this survey, 4 pelagic trawl hauls were carried out in the sea surface using the pelagic WB trawl.
Chief scientistBjorn Gunnarsson (Marine Research Institute, Reykjavik)
Coordinating bodyInternational Council for the Exploration of the Sea (ICES)
Cruise reportBjarni Saemundsson B4-2013 cruise report bjarnisaemundsson_b4-2013.pdf — access key 'C' (0.28 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Specific59 45N to 63 45N, 0W to 22 15W
Track chartsBjarni Saemundsson B4-2013 cruise track — bjarnisaemundsson_b4-2013trk.pdf (00 MB)