Fiskaaling Aquaculture Research Station of the Faroes

Faroe Islands

Fiskaaling Aquaculture Research Station of the Faroes

Faroe Islands
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Patursson E.J.,Fiskaaling Aquaculture Research Station of the Faroes | Patursson E.J.,Technical University of Denmark | Simonsen K.,Fiskaaling Aquaculture Research Station of the Faroes | Visser A.W.,Technical University of Denmark | Patursson O.,Fiskaaling Aquaculture Research Station of the Faroes
Aquaculture Environment Interactions | Year: 2017

We assessed variations in salmon lice Lepeophtheirus salmonis population dynamics in Faroese salmon farms in relationship to their physical exposure to local circulation patterns and flushing with adjacent waters. Factors used in this study to quantify physical exposure are estimates of the freshwater exchange rate, the tidal exchange rate and dispersion by tidal currents. Salmon farms were ranked according to the rate of increase in the average numbers of salmon lice per fish. In a multiple linear regression, physical exposure together with temperature were shown to have a significant effect on the rate of lice infection. The sites with low exposure revealed higher rates of self-infection and internally driven outbreak dynamics, while high-exposure sites showed lower rates of self-infection, tending towards externally driven outbreak dynamics. The lowexposure sites also appeared to have a lower threshold of salmon stocking numbers for outbreaks of infection. The study presents a simple method of characterizing salmon farming fjords in terms of their different exposure levels and how they relate to potential self-infection at these sites. © The authors 2017.


Mols-Mortensen A.,Fiskaaling Aquaculture Research Station of the Faroes | Ortind E.a.G.,Fiskaaling Aquaculture Research Station of the Faroes | Ortind E.a.G.,Faroese Food and Veterinary Agency | Jacobsen C.,Technological University of Denmark | Holdt S.L.,Technological University of Denmark
Journal of Applied Phycology | Year: 2017

Ropes seeded directly with Saccharina latissima were deployed at different exposures (sheltered, current exposed and wave exposed) in a Faroese sound and characteristics of growth and quality of the biomass and surroundings were evaluated during the growth season from March to August 2015. Saccharina latissima individuals cultivated at the current exposed location were heavier compared to the individuals cultivated at the other locations; however, the total biomass yield was significantly lower at the current exposed location. The protein and nutritional value of the biomass varied with season but showed no correlation with exposure. The highest protein levels and EAA (essential amino acid) score were measured in the spring (April and May) samples. The amino acid composition was dominated by glutamate followed by aspartic acid; however, this was replaced by methionine in the July samples. Total Kjeldahl nitrogen was significantly higher in May and August compared to July, and the nitrate concentration in the biomass was significantly lower in May and August compared to July. Nitrate was most available in the seawater at the time of deployment (3rd of March) and decreased during spring and summer. Saccharina latissima was cultivated successfully at the sheltered, current exposed and wave exposed locations using a direct seeding method. However, our results indicate that the lower biomass yield at the current exposed cultivation location compared to the sheltered and wave exposed are due to the direct seeding method, and possible limitations using this method need further testing and optimization. © 2017 The Author(s)


a Nordi G.,Fiskaaling Aquaculture Research Station of the Faroes | Simonsen K.,Fiskaaling Aquaculture Research Station of the Faroes | Danielsen E.,Fiskaaling Aquaculture Research Station of the Faroes | Eliasen K.,Fiskaaling Aquaculture Research Station of the Faroes | And 5 more authors.
Aquaculture Environment Interactions | Year: 2015

The abundance of planktonic sea lice in the surface waters of the strait of Sundalagid, Faroe Islands was investigated from November 2013 to June 2014. The strait is 38 km long and hosts 6 salmon farms with coordinated farming cycles. The spatial distribution of planktonic sea lice for the entire strait was examined in 2 surveys with different wind and hydrographic conditions. Temporal changes were investigated every 2-3 wk at 3 set stations throughout the study. The spatial distribution of Lepeophtheirus salmonis copepodids was clearly influenced by the actual wind direction, as the copepodids were found where winds pushed surface waters towards the shore. The same spatial pattern was not found for Caligus elongatus copepodids. This might be related to a different vertical migration pattern. The abundance of C. elongatus was seasonal. It was the dominant planktonic sea louse during winter, with a mean abundance of 0.34 ± 0.13 ind. m-3, and was virtually absent during summer. Lepeophtheirus salmonis was present throughout the study, except during the last survey when the coordinated farming sites lay fallow. During winter when the warmest seawater was deep in the water column, L. salmonis copepodids were present in 47% of the samples and nauplii were only observed in 9%. In samples where the highest seawater temperature was at the surface, nauplii prevalence attained a high value of 53%, while copepodid prevalence increased to 60%. These results indicate that nauplii might actively seek the highest possible seawater temperature. © The authors 2015.


Winthereig-Rasmussen H.,Fiskaaling Aquaculture Research Station of the Faroes | Simonsen K.,Fiskaaling Aquaculture Research Station of the Faroes | Patursson O.,Fiskaaling Aquaculture Research Station of the Faroes
Ocean Engineering | Year: 2016

Computational fluid dynamics (CFD) simulations were performed on the flow through and around full-scale sea cages. The Reynolds average Navier–Stokes equations were solved using a finite volume approach. The realizable k−ϵ model was used to describe turbulence and porous media to represent the flow resistance effect of the net. Velocity deficit was investigated for a single cage, a row of five cages, and two rows of five cages, corresponding to the salmon farm at Gulin in the Faroe Islands. CFD simulations were compared with field measurement data from this farm. The comparison showed that the flow was overpredicted with up to 50% by the CFD simulations using a net solidity corresponding to the net specifications. A hypothesis is presented for the discrepancy between CFD simulations and field measurements, which includes net deformation and fish behavior. Using different cage layouts, different distances between cage centres, and different net soldities, the effects on flow through and around sea cages were examined and discussed. © 2016 Elsevier Ltd

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