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

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Johanne Dalsgaard Section for Aquaculture Hirtshals, Denm ark

Presentation of the NordicRAS netw ork and its activities

2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 2 DTU Aqua, Technical University of Denm ark

Why and Who are we?

• Why?

DTU Aqua initiative Speed up stagnant aquaculture industry

• Founded 2011 with NCM support
• Steering committee: Denmark, Norway,

Sweden, Finland, Iceland

Model trout farms Langsand Laks Danish Salmon

Ongoing activities

• Norwegian smolt & post-smolt
• RAS2020 (Nordic Aquafarms)
• Kingfish (Sashimi royal)
• Salmon (Fredrikstad seafoods)
• Atlantic Sapphire, Miami, USA

(Aim: 90 000 t/yr)

• Nordic Aquafarms, Maine, USA

(Aim: 40 000 t/yr)

• …

NordicRAS

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2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 3 DTU Aqua, Technical University of Denm ark

Main activities

W ebsite: w w w .NordicRAS.net NordicRAS

2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 4 DTU Aqua, Technical University of Denm ark

Main activities

Engineers Scientists Farmers Managers Equipment & syst.manuf. Consultants Veterinarians Other profs. w. RAS interests

Biennial w orkshop NordicRAS

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2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 5 DTU Aqua, Technical University of Denm ark

1 st 2 0 1 1

Helsinki Finland

2 nd 2 0 1 3

Ålborg Denm ark

3 rd 2 0 1 5

Molde Norw ay

4 th 2 0 1 7

Ålborg Denm ark AES session

5 th 2 0 1 9

Berlin Germ any Back-to-back

• Aquacult. Europe 2 0 1 9

Previous workshops

1 2 6 1 9 0 2 1 6

NordicRAS

2 2 5 ( 2 4 countries) 2 5 0 ? participants

2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 6 DTU Aqua, Technical University of Denm ark

Previous workshop topics

End-of-Pipe treatment Saltwater RAS Complete system approaches Online monitoring Energy

• ptimization

RAS in practice On-growing of different species WQ in RAS Microbiology & biofiltration Waste management Feed and waste charac. Gases & degassing Harmful substances Therapeutants Diseases in RAS Particles & microbial WQ

Common field of interests NordicRAS

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2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 7 DTU Aqua, Technical University of Denm ark

Particles and microbial WQ

Particle origin in RAS: - Faeces

‒ Feed spill ‒ Dust

Particle effects in RAS: - Loading on treatment units

‒ Stress on biofilter (elevated NH4

+, NO2

• )

‒ Stress on fish: - Directly?

• Indirectly?

Particulate & dissolved organic matter: feed for heterotrops:

• Surface attached
• Attached to particles
• Free swimming
• Heterotrops most abundant in RAS
• High growth rate
• Neutral / beneficial
• Opportunistic bac., potential

pathogens

Rojas-Tirado, PA 2018, Microbial water quality within Recirculating Aquaculture

• Systems. PhD. DTU Aqua. Technical University of Denmark

2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 8 DTU Aqua, Technical University of Denm ark

Particle size and surface area

Higher recirc. intensity  smaller particles increasingly difficult to remove Smaller particles  more surface area More surface area  more bacteria activity

Relationship between particle size and specific surface area

(www.shimadzu.com/an/powder/sald/data/appli/app3.html)

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2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 9 DTU Aqua, Technical University of Denm ark

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

(moving bed biofilter) Time Bacterial activity

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

2 nd Nordic w orkshop on fish health and w elfare of fish held in RAS Novem ber 2 0 1 8 10 DTU Aqua, Technical University of Denm ark

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)