Comparison of three unionid mussel species in removing green microalgae grown in recirculating aquaculture system effluent
Julkunen, V., Stevčić, Č., Pirhonen, J., & Pulkkinen, K. (2024). Comparison of three unionid mussel species in removing green microalgae grown in recirculating aquaculture system effluent. Hydrobiologia, Early online. https://doi.org/10.1007/s10750-024-05547-w
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HydrobiologiaDate
2024Copyright
© The Author(s) 2024
Global increase in aquaculture production has created a need to reduce its environmental impacts. Nutrients could be recycled especially at land-based recirculating aquaculture systems (RAS) by cultivating green microalgae in aquaculture effluent. However, microalgae are difficult to harvest. As a multi-trophic solution, mussels could be used in harvesting microalgae. We tested three European freshwater mussels (duck mussel Anodonta anatina, swan mussel A. cygnea, and swollen river mussel Unio tumidus) for filtering two common green microalgae (Monoraphidium griffithii and Selenastrum sp.) grown in RAS effluent. Mussels decreased microalgal concentrations in the tanks 42–83% over three consecutive trials. Algal concentrations at the end of each trial were lowest for both microalgae in tanks containing Anodonta mussels. Clearance rates were higher for Anodonta mussels than for U. tumidus. Mussels biodeposited more microalgae to tank bottoms when M. griffithii was filtered. Ammonium concentration decreased or did not change in tanks with M. griffithii, but increased in tanks containing Selenastrum sp. These results suggest that of the tested species Anodonta mussels and M. griffithii show best potential for RAS effluent bioremediation application. We conclude that a co-culture of microalgae and unionid mussels could be used for recycling nutrients in aquaculture.
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https://converis.jyu.fi/converis/portal/detail/Publication/213396095
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Open Access funding provided by University of Jyväskylä (JYU). This study was sponsored by Maa- ja vesitekniikan tuki ry with grant number 40374 and OLVI-foundation with grant number 20210560 for VJ, by the University of Jyväskylä for ČS and by the European Maritime and Fisheries Fund (EMFF) for JP.License
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