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Salmon parr tolerate more ammonia in the water than expected

More and more farmed salmon will have their early life in recirculating aquaculture systems. The most common production method to date in Norway has been flow-through systems, in which the water only passes the fish tank once. The recirculated water contains some ammonia which is excreted via the gills of the fish. “Today’s recommended limit of how much ammonia the salmon can tolerate is probably not adapted to the smolt production of the future,” the scientist says.

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