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

Sep 25, 2023 •177 likes •245 views

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

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

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