Why and Who are we? Ongoing activities Why? DTU Aqua initiative - PDF document

Presentation of the NordicRAS netw ork and its activities Johanne Dalsgaard Section for Aquaculture Hirtshals, Denm ark NordicRAS Why and Who are we? Ongoing activities • Why? DTU Aqua initiative Norwegian smolt & post-smolt • Speed up stagnant aquaculture industry RAS2020 (Nordic Aquafarms) • • Kingfish (Sashimi royal) Salmon (Fredrikstad seafoods) • Atlantic Sapphire, Miami, USA • ( Aim: 90 000 t/yr) Model trout Langsand Danish farms Laks Salmon Nordic Aquafarms, Maine, USA • ( Aim: 40 000 t/yr) … Founded 2011 with NCM support • • Steering committee: Denmark, Norway, • Sweden, Finland, Iceland 2 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 1

NordicRAS Main activities W ebsite: w w w .NordicRAS.net 3 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 NordicRAS Main activities Biennial w orkshop Engineers Other profs. w. Scientists RAS interests Veterinarians Farmers Consultants Managers Equipment & syst.manuf. 4 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 2

Previous workshops NordicRAS 2 5 0 ? participants 2 2 5 ( 2 4 countries) 2 1 6 1 9 0 1 2 6 5 th 1 st 2 nd 3 rd 4 th 2 0 1 9 2 0 1 1 2 0 1 3 2 0 1 5 2 0 1 7 Berlin Helsinki Ålborg Molde Ålborg Germ any Finland Denm ark Norw ay Denm ark Back-to-back AES Aquacult. Europe 2 0 1 9 session 5 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 NordicRAS Previous workshop topics Feed and waste End-of-Pipe RAS in practice charac. treatment Gases & degassing On-growing of Saltwater RAS different species Harmful substances Complete system WQ in RAS approaches Common Therapeutants field of Microbiology & interests Online monitoring biofiltration Diseases in RAS Waste Energy Particles & management optimization microbial WQ 6 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 3

Particles and microbial WQ Particle origin in RAS: - Faeces ‒ Feed spill ‒ Dust Particle effects in RAS: - Loading on treatment units + , NO 2 - ) ‒ Stress on biofilter (elevated NH 4 ‒ Stress on fish: - Directly? - Indirectly? Particulate & dissolved organic • Heterotrops most abundant in RAS matter: feed for heterotrops: • High growth rate - Surface attached • Neutral / beneficial - Attached to particles • Opportunistic bac., potential - Free swimming pathogens Rojas-Tirado, PA 2018, Microbial water quality within Recirculating Aquaculture 7 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Systems. PhD. DTU Aqua. Technical University of Denmark Novem ber 2 0 1 8 Particle size and surface area Higher recirc. intensity  smaller particles increasingly difficult to remove Smaller particles  more surface area Relationship between particle size and specific surface area (www.shimadzu.com/an/powder/sald/data/appli/app3.html) More surface area  more bacteria activity 8 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 4

Prelim iary feed dust trial Setup 8 kg rainbow trout/tank • • 100 g feed/day/tank • 70 L makeup water/day/tank (=700 L pr kg feed) Simpel recirc. system • Bacterial activity (moving bed biofilter ) Treatments: 1 tank feed directly from bag • 1 tank sieved feed • 1 tank 25 g dust/kg feed • 1 tank 50 g dust/kg feed • Time 9 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 Coming focus areas & potential collaboration as we see it • Cannot discuss technology without discussing diseases and vice versa What makes fish susceptible to diseases? • Interactions bewteen diseases – RAS environment - management • Therapeutants and water disinfection • None of these issues can be solved by technicians or veterinarians • by themselves but require collaboration 5 th NordicRAS w orkshop, 7 -8 Oct. 2 0 1 9 , Berlin, back to back • w ith Aquaculture Europe 2 0 1 9 ( 8 -1 0 Oct. 2 0 1 9 ) ( w w w .NordicRAS.net) 10 DTU Aqua, Technical University of Denm ark 2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 5