Publikasjoner og ansvarsområder
DISTRIBUTION AND ABUNDANCE OF SEA LICE LARVAE AROUND SALMON FARMS DETERMINED BY MANUAL COUNTING AND DNA BAR-CODING.
Evaluation of plastic curtains used as management measure against sealice infestation in the Norwegian Atlantic salmon fattening Cages
Dissolved oxygen variability in a commercial sea-cage exposes farmed Atlantic salmon to growth limiting conditions
Understanding dissolved O2 flux in marine cages, and how individual fish respond to and experience such variation, is critical to optimizing growth and production performance of farmed salmon. We used a high resolution environmental monitoring system to create a 3-dimensional map of a commercial mar...
Measurement and simulation of the three-dimensional flow pattern and particle removal efficiencies in a large floating closed sea cage with multiple inlets and drains
This study investigated the three-dimensional flow structures in an ellipsoid, closed sea fish cage. The results are presented using computational fluid dynamics (CFD) simulations and experimental measurements. Experimental residence time distribution (RTD) measurement and CFD simulation are the bes...
Critical swimming speed in groups of Atlantic salmon Salmo salar
Three-dimensional deformation of a large circular flexible sea cage in high currents: Field experiment and modeling
This paper presents the full-scale measurements of the deformation and current reduction of a large-scale fish sea cage submitted to high currents. Pressure tags were used to measure the cage deformation and the vertical displacement of the bottom ring, while an Acoustic Doppler Current Profiler (AD...
Changes to flow and turbulence caused by different concentrations of fish in a circular tank
The effects of juvenile Atlantic salmon (Salmo salar) on flow and turbulence in a circular tank were investigated. Three fish sizes were studied (37.5 g, 82.5 g and 218 g) with between 268,050 and 318,000 fish in a 15 m diameter by 4 m deep tank (mean stocking densities of 15.3 kg m–3, 35.6 kg m–3, ...
Density-consistent Initialization of SPH on a Regular Cartesian Grid: Comparative Numerical Study of 10 Smoothing Kernels in 1, 2 and 3 Dimensions
Smoothed particle hydrodynamics (SPH) simulations are often initialized on a regular Cartesian grid. Ten SPH kernels were analyzed numerically with respect to their ability to correctly reproduce a uniform density distribution. Three types of kernels were identified. The number of neighboring partic...
3-DIMENSIONAL FLOW FIELD VISUALIZATION IN THE WAKE OF A GROUP OF FISH FARMING SEA CAGES
There is a need for better understanding of the flow dynamics through and around ocean fish farms. There has been documented discrepancy, between experimental measurements and Computational Fluid Dynamics (CFD), of the velocity deficit in the wake of a fish farming cage . A visualization of the a...