Salmon farming has been a great success story in Norway over the last 50 years, but the industry is still much disputed. Right from the start, farmers were licensed, with a limit on total production. In addition, each site was regulated according to carrying capacity. Over the years, various management measures have been used to regulate both the total production and environmental conditions, before ending up with Maximum Allowable Biomass (MAB). Since 2005, this has been the common “currency” in all regulations. Since then, the industry has experienced various new management schemes, to cater for environmental sustainability (green licenses, the traffic light system, development licenses, offshore as well as land based production), all based on MAB. The article sets out to explain why and how Norwegian authorities have chosen to regulate total production at national level, and when this failed, why they have maintained MAB as a key regulatory instrument.

在过去的 50 年里，三文鱼养殖在挪威取得了巨大的成功，但该行业仍然存在很多争议。从一开始，农民就获得许可，总产量有限制. 此外，每个站点都根据承载能力进行调节。多年来，在最终达到最大允许生物量 (MAB) 之前，已使用各种管理措施来调节总产量和环境条件。自 2005 年以来，这一直是所有法规中的通用“货币”。从那时起，该行业经历了各种新的管理计划，以适应环境可持续性（绿色许可证、交通灯系统、开发许可证、海上和陆上生产），所有这些都基于 MAB。文章着手解释挪威当局为何以及如何选择在国家层面监管总产量 ，以及当这失败时，他们为何将 MAB 保持为关键监管工具。