• A Formation of Unmanned Vehicles for Tracking of an Acoustic Fish-Tag 

      Zolich, Artur Piotr; Johansen, Tor Arne; Alfredsen, Jo Arve; Kuttenkeuler, J; Erstorp, E (Chapter; Peer reviewed, 2017)
      In this paper we present a proof-of-concept for an hydro acoustic fish-tag position estimation and tracking system. In our field-tested concept, a formation of Unmanned Surface Vehicles (USV) creates a mobile array of ...
    • A novel Doppler based speed measurement technique for individual free-ranging fish 

      Hassan, Waseem; Føre, Martin; Pedersen, Magnus Oshaug; Alfredsen, Jo Arve (Chapter, 2019)
      A novel Doppler based speed measurement technique for free-ranging acoustically tagged fish was developed and validated through a field experiment in a marine aquaculture farm. For emulated swimming speeds in the range ...
    • Akustisk posisjoneringssystem for fisk: PinPoint 

      Hammer, Joakim (Master thesis, 2008)
      Sammendrag Hensikten med denne masteroppgaven har vært å utvikle en autonom hydrofonbøye for PinPointsystemet. Hydrofonbøyen består av tre moduler; en kommunikasjonsmodul, en GPS-modul og en hydrofonmodul. PinPoint-systemet ...
    • Assimilering av sonardata med matematiske modeller av fiskeatferd i oppdrettsmerder 

      Myrberg, Sondre (Master thesis, 2019)
      En viktig del av det å drive med oppdrett er å ha kontroll på tilstanden i merden. Ekkolodd er et hjelpemiddel for å overvåke og følge med på hva som skjer under overflaten, men hva slags informasjon gir egentlig et ekkolodd, ...
    • Automated First-Feeding and Monitoring System for Marine Hatchery 

      Eriksen, Tor-Inge J (Master thesis, 2013)
      CodTech provides the Norwegian, and European aquaculture industry with facilities for testing new techniques and equipment related to the rearing of marine fish larvae. The facilities provides cutting edge technology to ...
    • Automatic Inspection of Cage Integrity with Underwater Vehicle 

      Jakobsen, Rolf Arne Hult (Master thesis, 2011)
      This thesis is a preliminary study for the initiative to develop an autonomous AUV foruse in aquaculture. A micro-ROV is used to test the concept of inspecting net integrityin sh cages by analyzing video feed from a video ...
    • Automatisert system for marin fiskeyngelproduksjon 

      Lund Jensen, Olav (Master thesis, 2008)
      Stor etterspørsel etter hvitfisk på verdensmarkedet har ført til økt interesse for oppdrett av marine fiskearter. For å oppnå en storskala produksjon av marin fisk kreves det også en storskala produksjon av fiskeyngel av ...
    • Autonomous environmental monitoring probe for aquaculture sites 

      ramezaniakhmareh, alireza (Master thesis, 2012)
      This project aims to develop an instrument that is capable of moving vertically in a controlled manner along a taut string from the sea surface to a predetermined depth while measuring pertinent seawater parameters. The ...
    • Biomonitoring using tagged sentinel fish and acoustic telemetry in commercial salmon aquaculture: A feasibility study 

      Føre, Martin; Frank, Kevin; Dempster, T; Alfredsen, Jo Arve; Høy, Erik (Journal article; Peer reviewed, 2017)
      We tested if it is technically feasible to monitor fish in real-time in full-scale commercial fish farms using acoustic telemetry. 31 Atlantic salmon were equipped with acoustic transmitter tags containing depth sensors. ...
    • Control system for rotifer production 

      Rumí Pastor, Alejandro (Master thesis, 2007)
      Rotifers are used extensively as start feed for many cultured marine fish species and commercial size hatcheries require stable daily supply of high quality rotifers of substantial volumes. This is often done relying on ...
    • Design of a low power acoustic Telemetry Buoy 

      Moen, Stian Orø (Master thesis, 2009)
      A telemetry buoy is a standalone device used to receive acoustic pulse-position modulated signals from digital tags attached to fish. The buoy is submerged in the sea and will store any valid signals from tagged fish. The ...
    • Designing an embedded closed loop motor control system 

      Riple, Laurits Telle (Master thesis, 2018)
      A Polargraph drawing machine is a machine that positions the drawing gondola by using a couple of cords. By doing that and controlling the drawing action it s possible to print an image much larger than conventional ...
    • Development of DP System for Merlin WR200 ROV 

      Knausgård, Lasse Muri (Master thesis, 2013)
      This thesis presents and documents the efforts to model, develop and implement a full six-degree-of-freedom dynamic positioning system for IKM Subsea's Merlin WR200 ROV. It also documents the performance of the system ...
    • Dynamic Positioning for ROV Operating in Fish Farms 

      Drozdik, Ron (Master thesis, 2015)
      The usages of Remotely Operated Unmanned Underwater Vehicles (ROVs') for inspection of marine structures is today an essential part of the offshore industry. However, in the case of inspection of fish farms, the ROV has ...
    • Feed Distribution in Large Scale Sea Cage Aquaculture: Experiments, modelling and simulation 

      Skøien, Kristoffer Rist (Doctoral theses at NTNU;2017:14, Doctoral thesis, 2017)
      The objective of this thesis was to gain new insight into the process of feeding in large scale sea cage aquaculture and investigate novel methods of feeding in order to increase profitability, welfare and minimize ...
    • Feed intake in Atlantic salmon fed with or without surface spreading of feed 

      Aas, Turid Synnøve; Ytrestøyl, Trine; Åsgård, Torbjørn Einar; Skøien, Kristoffer Rist; Alver, Morten Omholt; Alfredsen, Jo Arve (Journal article, 2020)
      In intensive salmon farming, it is common practice to spread the feed over a large surface area, assuming that spreading of the feed increases feed intake in the fish. However, the impact on the feed pellets during spreading ...
    • Feed intake in Atlantic salmon fed with two different spreading patterns of feed 

      Aas, Turid Synnøve; Ytrestøyl, Trine; Åsgård, Torbjørn Einar; Skøien, Kristoffer Rist; Alver, Morten Omholt; Alfredsen, Jo Arve (Report;14, Research report, 2015)
      Atlantic salmon with initial body weight 0.6 kg kept in 3.3 m3 tanks was fed one meal daily, either by dropping the feed from one point, or by spreading the feed over the water surface, for one month. The relative feed ...
    • Feed spreaders in sea cage aquaculture – Motion characterization and measurement of spatial pellet distribution using an unmanned aerial vehicle 

      Skøien, Kristoffer Rist; Alver, Morten; Zolich, Artur Piotr; Alfredsen, Jo Arve (Journal article; Peer reviewed, 2016)
      Pneumatic rotary feed spreaders represent essential equipment in the feeding system of present day industrial-scale sea cage aquaculture. This study presents experimentally obtained attitude measurements and corresponding ...
    • Fish welfare based classification method of ocean current speeds at aquaculture sites 

      Jónsdóttir, Kristbjörg Edda; Hvas, Malthe; Alfredsen, Jo Arve; Føre, Martin; Alver, Morten; Bjelland, Hans Vanhauwaert; Oppedal, Frode (Journal article; Peer reviewed, 2019)
      ABSTRACT: A major trend in marine aquaculture is to move production to more exposed sites with occasionally rough ocean current events. However, it is unclear whether fish will thrive in these extreme environments, since ...
    • Heart rate and swimming activity as stress indicators for Atlantic salmon (Salmo salar) 

      Svendsen, Eirik; Føre, Martin; Økland, Finn; Gräns, Albin; Hedger, Richard David; Alfredsen, Jo Arve; Uglem, Ingebrigt; Rosten, Carolyn; Frank, Kevin; Erikson, Ulf Gøran; Finstad, Bengt (Peer reviewed; Journal article, 2020)
      We investigated the relationship between telemetry measurements of heart rate and swimming activity and the physiological status in farmed Atlantic salmon (Salmo salar) to assess the potential to use telemetry measurements ...