Browsing NTNU Open by Author "Skøien, Kristoffer Rist"
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A Modular Software and Hardware Framework with Application to Unmanned Autonomous Systems: Interacting Modules, Error Detection and Hardware Design
Skøien, Kristoffer Rist (Master thesis, 2011)The Department of Engineering Cybernetics at the Norwegian University of Science andTechnology established the Unmanned Vehicle Laboratory fall 2010. The goal is to havestudents develop a fully functional autonomous aerial ... -
Determining spatial feed distribution in sea cage aquaculture using an aerial camera platform
Lien, Andreas Myskja; Schellewald, Christian; Stahl, Annette; Frank, Kevin; Skøien, Kristoffer Rist; Tjølsen, Jan Inge (Journal article; Peer reviewed, 2019)Within this paper we describe an unmanned aerial vehicle (UAV) based method to estimate the spatial feed pellet distribution in salmon fish-cages and exploit it within a case study to determine the radial pellet distribution ... -
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 ... -
Intrinsic settling rate and spatial diffusion properties of extruded fish feed pellets
Skøien, Kristoffer Rist; Aas, Turid Synnøve; Alver, Morten; Romarheim, Odd Helge; Alfredsen, Jo Arve (Journal article; Peer reviewed, 2016)Spatial and temporal feed distribution in sea cages are important factors for the farmer, fish and environment due to the strong relation to growth, feed loss, pollution and welfare. This study presents a set of experimentally ... -
Modelling and simulation of rotary feed spreaders with application to sea cage aquaculture – A study of common and alternative designs
Skøien, Kristoffer Rist; Alver, Morten; Alfredsen, Jo Arve (Journal article; Peer reviewed, 2018)Rotary feed spreaders are extensively used in large scale fish aquaculture and are tasked with distributing pelletized feed in a spatially uniform manner over the water surface. Questions have been raised with respect to ... -
Precision fish farming: A new framework to improve production in aquaculture
Føre, Martin; Frank, Kevin; Norton, Tomas; Svendsen, Eirik; Alfredsen, Jo Arve; Dempster, Timothy David; Eguiraun, Harkaitz; Watson, Win; Stahl, Annette; Sunde, Leif Magne; Schellewald, Christian; Skøien, Kristoffer Rist; Alver, Morten; Berckmans, Daniel (Journal article; Peer reviewed, 2017)Aquaculture production of finfish has seen rapid growth in production volume and economic yield over the last decades, and is today a key provider of seafood. As the scale of production increases, so does the likelihood ...