Abstract
Event Abstract Back to Event Time to the first medical treatment of farmed salmon to control salmon lice, a survival analysis approach. Ekaterina Mogstad1*, Anja B. Kristoffersen1, Peder A. Jansen1 and Ingrid K. Glad2 1 Norwegian Veterinary Institute, Norway 2 University of Oslo, Norway The spread of salmon lice has long been and continues to be an increasing problem for the fish farming industry, causing economic and environmental problems. In this study we wished to increase the understanding of this problem. The main interest was analysing what factors that cause lice to appear and require fish to be treated against lice, and whether those factors can be controlled by fish farmers. The modelling approach used in this study has been multiple Cox regression. This method is widely used in survival analyses. We analysed the hazard rates related to first bath treatments against salmon lice at the farms along the Norwegian coast, and used them to model the "survival" times, i.e. time till treatment. The results showed that factors mostly addressing to the neighbor's situation (distances, neighbor's lice amount and the infection spread from them) are most significant for time till first bath treatment. Seawater temperature and amount of fish at the farm of interest also appeared to be significant in the analysis, but only when they were allowed to vary each month. We could also see that the lice situations are different in different parts of Norway, and vary from one year to the next. Keywords: statistics, survival analysis, Cox regression models, salmon lice, Salmon, Fish Farming Conference: AquaEpi I - 2016, Oslo, Norway, 20 Sep - 22 Sep, 2016. Presentation Type: Oral Topic: Aquatic Animal Epidemiology Citation: Mogstad E, Kristoffersen AB, Jansen PA and Glad IK (2016). Time to the first medical treatment of farmed salmon to control salmon lice, a survival analysis approach.. Front. Vet. Sci. Conference Abstract: AquaEpi I - 2016. doi: 10.3389/conf.FVETS.2016.02.00033 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 29 May 2016; Published Online: 14 Sep 2016. * Correspondence: Mrs. Ekaterina Mogstad, Norwegian Veterinary Institute, Oslo, Norway, katja.jakobsen123@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Ekaterina Mogstad Anja B Kristoffersen Peder A Jansen Ingrid K Glad Google Ekaterina Mogstad Anja B Kristoffersen Peder A Jansen Ingrid K Glad Google Scholar Ekaterina Mogstad Anja B Kristoffersen Peder A Jansen Ingrid K Glad PubMed Ekaterina Mogstad Anja B Kristoffersen Peder A Jansen Ingrid K Glad Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.
Highlights
1.1 BackgroundThe fish farming industry has grappled with the increasing problem of sea lice for a long time
I conclude that the Cox proportional hazards (PH) model is well validated according to some of the chosen methods
Using a survival analysis approach, and more precisely Cox analysis, allowed me to study the time-changing hazard rates related to salmon lice treatment
Summary
The fish farming industry has grappled with the increasing problem of sea lice for a long time. In Norway, a country with unique access to the sea, the fish farming industry has become one of the big players in the economy with several companies listed on the stock exchange grossing billions of Kroner every year from salmon farming. At the moment Norway is the world’s largest producer of bred Atlantic salmon [Fisheries.no 2014]. This intensification of salmon farming leads to an increased prevalence of different infectious diseases and parasites, that in turn causes economic and environmental problems. One of these parasites is the salmon louse (Lepeophtheirus salmonis), an ecto-parasite living on and off of the surface tissues of salmonid fishes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
