Researchers from the Natural Resources Institute Finland (Luke) and VTT Technical Research Centre of Finland (VTT) have developed novel fiber-based materials to address off-flavors and water mold in recirculating aquaculture systems (RAS), according to the Global Seafood Alliance. 

The cellulose-based fibers are chemically treated to capture off-flavor compounds and water mold spores from the water, significantly reducing their presence in fish and the environment. Initial tests demonstrated that the materials accumulated off-flavor compounds at concentrations up to 1,000 times higher than untreated water, effectively reducing these compounds to below sensory thresholds in farmed fish.

Water mold causes significant economic losses in aquaculture, particularly in salmonid farms, while also threatening biodiversity in conservation efforts. Existing treatments for water mold often lack safety or efficacy. However, the new fibers demonstrated a marked reduction in mold spores during trials, according to the researchers.

Patent applications for these technologies have been filed, and commercial-scale testing is planned.

"These new cellulose-based capture materials will capture water mold spores and off-flavor compounds from the water, preventing them from accumulating in the fish," said Hannes Orelma, research team leader at VTT.

"Our solutions can have a significant impact on the profitability of the industry," added Jani Lehto, director of Luke’s bioeconomy and environment unit.