Marine biofouling costs the European aquaculture industry an estimated 260 million euros per year. That number covers the obvious expenses — cleaning crews, replacement nets, anti-fouling treatments — but also the hidden ones: fish that grow slower in fouled pens, higher mortality from gill disease, and mooring chains that fail under loads they were never designed to carry. When a farmer in Norway hoses barnacles off a cage net, the bill for the cleaning crew is the smallest part of what that fouling actually cost. Use the biofouling cost calculator to estimate the full picture for your own operation.