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The ongoing study of off-flavour with John Davidson of The Freshwater Institute
April 17, 2024 By Jean Ko Din
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.
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John Davidson, research scientist at The Freshwater Institute
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Fish in purge (Photo: The Freshwater Institute)
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Geosmin and MIB levels in fed and fasted Atlantic salmon during a 6-day depuration period (Davidson et al., 2023). (Photo: Freshwater Institute)
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Weight loss percentages in fed and fasted rainbow trout over a 10-day depuration period. (Photo: Freshwater Institute)
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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)
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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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