Jokumsen, Alfred ; Høglund, Erik; Lund, Ivar; Madsen, Lone; Pedersen, Lars-Flemming; Nielsen, Max; Nielsen, Thorkild; Larsen, Villy J. and Larsen, Erling P. (2014) ROBUSTFISH: NEW POSSIBILITIES FOR GROWTH AND ROBUSTNESS IN ORGANIC AQUACULTURE. Poster at: Aquaculture Europe 2014, San Sebastian, Spain, 14-17 October 2014.
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Summary
The aim of Robustfish project is to answer the following research questions: (1) Is it possible to select robust rainbow trout fry early in development before they enter the more cost intensive steps in the production cycle? (2) Does sustainable (non-fish based) dietary lipid sources affect stress resilience and immune-competence of the fry? (3) Related to (1) and (2): Is improved resistance to RTFS achieved? (4) How will the market respond to a significant increase in production of organic trout, i.e. consumer preferences and competiveness by companies in the value chain?
RobustFish will strengthen the development of Danish organic trout production. In this respect the robustness of the fry to diseases is crucial, i.a. RTFS. The robustness of the fry seems to be related to larval developmental rate and to the dietary content of specific Ω-3 fatty acids (HUFAs). Stress and RTFS challenge tests will be performed to investigate if these two factors can be included in strategies to increase the robustness of the fry. Further, the effect of water treatments on health and welfare using approved agents (Pedersen et al., 2013) is tested. RobustFish will create growth – based on organic principles and in a balance between environment, ethics and economy. The efforts will also aim at improving the productivity of the conventional trout farming by a lower prevalence of RTFS, reduced medication and lower environmental impact. Connected to these efforts RobustFish also will provide needed knowledge about market conditions and consumer attitudes, including the competitive effect of increased production (Nielsen et al., 2007). Mapping the existing types of organic aquaculture products in European markets will pave the way for product development and increased market share.
Summary translation
RobustFish vil styrke udviklingen af økologisk ørred produktion i Danmark. Ifølge EU regelsættet for økologisk akvakultur skal den økologiske fiskeproduktion udelukkende være baseret på økologisk yngel fra 2016. Da medicinbehandling af økologisk ørred er uønsket og kun er tilladt i stærkt begrænset omfang, er ynglens robusthed overfor bl.a. den alvorligste yngelsygdom i dansk ørredopdræt, YDS (”yngeldødeligheds-syndrom”), særdeles vigtig. Ynglens robusthed vil blive målt i forhold til ynglens swim-up adfærd (first feeding) og performance under opvæksten. Indholdet af specifikke essentielle Ω-3 fedtsyrer i foderet til ynglen er særlig vigtig for fiskens vækst, sundhed og velfærd, herunder robusthed over for stress. Dette skal undersøges ved stress tests samt challenge tests over for YDS. Endvidere belyses effekten af vandbehandling med godkendte hjælpestoffer i økologisk opdræt i forhold til fiskevelfærd. RobustFish vil skabe vækst - baseret på økologiske principper og i en balance mellem miljø, etik og økonomi, men indsatsen vil tillige styrke den konventionelle ørredproduktion ved lavere forekomst af YDS, reduceret sygdomsbehandling og lavere miljøpåvirkning. I sammenhæng hermed vil RobustFish også bidrage med vigtig viden om markedsforhold og forbrugerkendskab, herunder effekten af forøget produktion på pris- og konkurrencevilkår. En kortlægning af eksisterende typer af økologiske akvakultur produkter i Europa skal danne afsæt for produktudvikling og øget afsætning.
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