- a global leader in aquaculture net-protection and antifouling solutions Antifouling in Aquaculture: Preferred supplier for more than 30 years Our fish farming products have been preferred by leading aquaculture companies all over the world for more than three decades. Operating methods and marine fouling differ significantly from company to company, both locally and globally. With our strong focus on the environment, fish health, fish growth and operating conditions, we are able to provide a wide range of quality products. We help you with the right choices for your operations. Steen-Hansen is ISO 9001 and 14001 certified. We also pride ourselves on being the biological leader in this field: www.bookonfouling.com