Bjarni Saemundsson B4-2013
Cruise summary report
|Ship name (ship code)||Bjarni Saemundsson (46BS)|
|Cruise period||2013-06-10 — 2013-06-26|
|Port of departure||Reykjavík, Iceland|
|Port of return||Reykjavík, Iceland|
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.
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 scientist||Bjorn Gunnarsson (Marine Research Institute, Reykjavik)|
|Coordinating body||International Council for the Exploration of the Sea (ICES)|
|Cruise report||(0.28 MB)|
|General||North East Atlantic Ocean (limit 40W)|
|Specific||59 45N to 63 45N, 0W to 22 15W|
|Track charts||(0.09 MB)|