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Fisken og havet - 2013

The fish and the Sea no. 2 - 2013: Impacts of fisheries and aquaculture on sediments and benthic fauna: suggestions for new management approaches

The report describes the fishing gears that contact the seabed used in Norway, and also details the geographical areas affected. The report describes how modifying fishing gears can reduce the impact on seabed habitats, and suggests actions to be taken to reduce the effects of trawling on sediments and benthic fauna.

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Fisken og havet nr. 7- 2013 Evaluation of a Nordic Seas 4 km numerical ocean model hindcast archive (SVIM), 1960-2011

A 52 year (1960-2011) numerical ocean model hindcast archive is evaluated. Overall, we find that the water masses that are directly influenced by Atlantic Water are realistically represented in the model, both in terms of advection/transport and hydrographic and dynamic variability. Inshore of the Norwegian Atlantic slope Current, the salt relaxation scheme applied negates variability in salinity within the Norwegian Coastal Current. This is most pronounced in the upper part of the water column. The modelled temperature variability in the near-shore waters is, however, in close agreement with observations. Within the two Norwegian Sea basins, the heat/freshwater content is unrealistically low/high, probably due to too little slope-basin eddy-fluxexchange between the slope current and the interior basins. In shelf areas (e.g. the Barents Sea and the North Sea), we find that the model to a large degree resembles the variability within the Atlantic-influenced water masses, while the salinity relaxation inhibits variability in the salinity within water masses dominated by coastal water.

 

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Fisken og havet no. 9-2013: Report on cruises and fixed oceanographic data stations, 2012

The report presents cruises carried out by the research vessels ”G.O. Sars”, ”Johan Hjort”, ”Håkon Mosby”,
”G.M. Dannevig”, “Helmer Hanssen” and some hired commercial fishing vessels on behalf of IMR and UiB during 2012. The charts mainly show CTD-, trawl and plankton stations.
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Fisken og havet nr. 10: Power-budget and echo-integrator equations for fish abundance estimation

For abundance estimation and species identification on fisheries acoustic surveys, control with temperature and finite amplitude effects in the sea demands the calibration factor C of the conventional echo-integrator equation to be fully known in terms of the sonar system’s electrical and acoustical parameters.

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