Browsing NTNU Open by Author "Volent, Zsolt"
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Characteristic current flow through a stocked conical sea-cage with permeable lice shielding skirt
Jonsdottir, Kristbjørg Edda; Pascal, Klebert; Volent, Zsolt; Alfredsen, Jo Arve (Peer reviewed; Journal article, 2021)The characteristic current flow field around a 55 m deep full-scale stocked conical Atlantic salmon sea-cage equipped with a 10 m permeable skirt was studied experimentally using acoustic Doppler velocimeters and profilers. ... -
Current flow and dissolved oxygen in a full-scale stocked fish-cage with and without lice shielding skirts
Jónsdóttir, Kristbjörg Edda; Volent, Zsolt; Alfredsen, Jo Arve (Peer reviewed; Journal article, 2020)Shielding skirts are widely used on Atlantic Salmon sea-cages as a non-invasive preventive measure against salmon lice infestations. The skirts are however known to impact the current flow and thereby the environment within ... -
Detection of a stress related acoustic signature by passive acoustic monitoring in Atlantic salmon farming
Jónsdóttir, Kristbjörg Edda; Mathiassen, John Reidar Bartle; Svendsen, Eirik Starheim; Rosten, Carolyn; Bloecher, Nina; Føre, Martin; Olsen, Rolf Erik; Finstad, Bengt; Volent, Zsolt (Peer reviewed; Journal article, 2024)Crowding is a necessary operation for moving fish out of or between sea cages in Atlantic salmon farming. These operations consist of gradually reducing available volume in the nets to increase the biomass density. This ... -
Dynamics of dissolved oxygen inside salmon sea-cages with lice shielding skirts at two hydrographically different sites
Jónsdóttir, Kristbjörg Edda; Volent, Zsolt; Alfredsen, Jo Arve (Peer reviewed; Journal article, 2020)Shielding skirts are widely used as a non-invasive preventive measure against salmon lice Lepeophtheirus salmonis infestations on Atlantic salmon Salmo Salar L. in sea-cages. Low levels of dissolved oxygen (DO) are reported ... -
Experimental study of current forces and deformations on a half ellipsoidal closed flexible fish cage
Strand, Ida Marlen; Sørensen, Asgeir Johan; Volent, Zsolt; Lader, Pål (Journal article; Peer reviewed, 2016)Closed flexible fish cages are proposed as a new concept in marine aquaculture, replacing the conventional net cages in order to meet ecological challenges related to fish lice and escapes. It is important to understand ... -
Experimental study of installation procedure and volume estimation of tarpaulin for chemical treatment of fish in floating cages
Volent, Zsolt; Birkevold, Jens; Stahl, Annette; Lien, Andreas Myskja; Sunde, Leif Magne; Lader, Pål Furset (Journal article; Peer reviewed, 2017)In the salmon industry chemical delousing is done by enclosing the cage in a tarpaulin, and then mixing the chemical agent in the enclosed water volume. Correct dosage is important to obtain the wanted effect, and in order ... -
Identification of spectral signature for in situ real-time monitoring of smoltification
Svendsen, Eirik; Volent, Zsolt; Schellewald, Christian; Tsarau, Andrei; Bjorgan, Asgeir; Venås, Birger; Bloecher, Nina; Bondø, Morten Steen; Føre, Martin; Jónsdóttir, Kristbjörg Edda; Stefansson, Sigurd Olav (Peer reviewed; Journal article, 2021)We describe the use of an optical hyperspectral sensing technique to identify the smoltification status of Atlantic salmon (Salmo salar) based on spectral signatures, thus potentially providing smolt producers with an ... -
Modeling of Hydroelastic Response of Closed Flexible Fish Cages due to Sea Loads
Strand, Ida Marlen (Master thesis, 2013)Norway is presently the worlds biggest producer of Atlantic salmon. The traditionally used open-net-structures are probably the most important reason for the Norwegian success.The very nature of aquaculture, where fish is ... -
Modellforsøk med dukbasert avlusing Beskrivelse av gjennomføringen av modellforsøk i Hirtshals - Foreløpig rapport
Volent, Zsolt; Birkevold, Jens; Stahl, Annette (Research report, 2014)Det er avgjørende å ha god kontroll på volumet under en avlusing, for å kunne beregne innblanding av lusemidler, slik at en oppnår ønsket behandlingskonsentrasjon. En for høy konsentrasjon kan skade fisken, og for lav ... -
Modelling the cultivation and bioremediation potential of the kelp Saccharina latissima in close proximity to an exposed salmon farm in Norway
Broch, Ole Jacob; Ellingsen, Ingrid H.; Forbord, Silje; Wang, Xinxin; Volent, Zsolt; Alver, Morten; Handå, Aleksander; Andresen, Kjersti; Slagstad, Dag; Reitan, Kjell Inge; Olsen, Yngvar; Skjermo, Jorunn (Journal article; Peer reviewed, 2013)A 3-dimensional hydrodynamic−ecological model system (SINMOD) was used to estimate the full-scale cultivation potential of the brown alga Saccharina latissima in integrated multi-trophic aquaculture (IMTA) with Atlantic ... -
Ocean Colour and Phytoplankton Dynamics - An examination of the Forel-Ule scale in a modern context
Mynors, Julie Christine Towers (Master thesis, 2017)The Forel-Ule scale as a method of determining ocean colour has been in use for over 100 years. Ocean colour is a result of inherent optical properties (IOP) in the water, including phytoplankton biomass, coloured dissolved ... -
Remote sensing of marine environment: Applied surveillance with focus on optical properties of phytoplankton, coloured organic matter and suspended matter
Volent, Zsolt (Doktoravhandlinger ved NTNU, 1503-8181; 2009:178, Doctoral thesis, 2009)Light from the Sun reaching the Earth and sea surface contains the entire wavelength band from ultraviolet (180-400 nm), visible (400-700 nm) and far into the infrared and radio wave region (>700 nm). The light penetrates ... -
Wave response of closed flexible bags
Lader, Pål; Fredriksson, David W.; Volent, Zsolt; DeCew, Jud; Rosten, Trond Waldemar; Strand, Ida Marlen (Journal article; Peer reviewed, 2017)Recent environmental considerations, as salmon lice, escape of farmed fish and release of nutrients, have prompted the aquaculture industry to consider the use of closed fish production systems (CFPS). The use of such ...