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The ongoing study of off-flavour with John Davidson of The Freshwater Institute
April 17, 2024 By Jean Ko Din
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Research scientist, John Davidson, and The Freshwater Institute team are conducting some of the leading research around understanding off-flavour in recirculating aquaculture systems. In this episode, he shares his latest findings with co-hosts Jean Ko Din and Justin Henry. They talk about how conversations around off-flavour in the industry have changed over time.
- John Davidson, research scientist at The Freshwater Institute
- Fish in purge (Photo: The Freshwater Institute)
- Geosmin and MIB levels in fed and fasted Atlantic salmon during a 6-day depuration period (Davidson et al., 2023). (Photo: Freshwater Institute)
- Weight loss percentages in fed and fasted rainbow trout over a 10-day depuration period. (Photo: Freshwater Institute)
- Geosmin levels in depurating barramundi at different stocking densities and flushing rates. Broken lines indicate approximate human threshold of detection at 100 ng/kg. (Photo: Freshwater Institute)
- Replicated depuration systems with focus on the feeders (Photo: Sam Levitan, courtesy of The Freshwater Institute)
Further reading:
- Research summary: “Evaluating the feasibility of feeding RAS-produced fish during the depuration process” By John Davidson, Snir Azaria and Jaap van Rijn (Hatchery International, March/April 2024)
- Full peer-reviewed article: “Evaluating the feasibility of feeding RAS-produced Atlantic salmon (Salmo salar) during the depuration process: effects on fish weight loss and off-flavor remediation” (Journal of Applied Aquaculture, Sept. 27, 2023)
- “Water quality, waste production, and off-flavor characterization in a depuration system stocked with market-size Atlantic salmon Salmo salar” (World Aquaculture Society, February 2023)
- “Depuration system flushing rate affects geosmin removal from market-size Atlantic salmon Salmo salar” (Aquaculture Engineering, August 2020)
- More research from The Freshwater Institute
- John Davidson and Justin Henry’s first RAS Talk episode together on “Keys to mitigating off-flavour in RAS-raised fish“
- Sign up to RASTECH 2024 conference to attend the Freshwater Institute’s research session. Check out the full program.
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