Could a microscopic algae bloom quietly reshape Norway's salmon farming season before most of the industry even understands what's happening? This week, we're tracking the Pseudochattonella bloom spreading across southern Norway, walking through the three distinct phases of the outbreak so far, from the early mortality events at Mowi's Flekkefjord sites in early March to the second wave building near Arendal just days ago. We break down what makes this particular species behave the way it does, how it compares to the Chrysochromulina bloom that devastated northern Norway in 2019, and why Chile's catastrophic 2016 event still serves as the industry's clearest warning of what's possible when conditions align. We close with what farmers and operators should be watching in the weeks ahead, and why the difference between a contained event and a serious operational problem often comes down to how early the right signals are being read. 

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