Copper paint used to be the default answer. Coat the nets, kill the fouling, move on. But copper accumulates in sediments, and regulators across Europe have started pushing back. Norwegian fjords already have restrictions. The EU Biocidal Products Regulation is tightening approval conditions. So farms are combining methods instead — wrasse that eat hydroids, silicone coatings that let barnacles slide off, mechanical cleaners that run between production cycles. No single method replaces copper entirely, but the methods comparison tool shows how the mix can get close. Read more about copper-free alternatives that are gaining traction across the industry.