挪威通过有效的全球营销战略，将养殖三文鱼产业发展成为世界规模最大，目前供应全球超过一半的大西洋三文鱼[1]。作为挪威第二大出口产业，三文鱼养殖的产值达180亿美元，仅次于石油[1]。然而，这一产业的快速扩张正在对当地海洋生态造成严重破坏。
由于现有养殖场缺乏底部密闭设施，鱼类粪便和饲料直接排入峡湾，引发营养过剩、有害藻类爆发和水体缺氧等连锁反应[1]。哈当格峡湾深层水体的氧气含量自20世纪50年代以来已下降三分之一[1]。同时，养殖产业还面临鱼类健康问题加剧的局面——低等级"生产鱼"的数量在不到十年内增加了一倍多[1]。此外，即使在已闲置20年的养殖地点，研究人员仍能检测到农药残留[1]。
为应对这些环境挑战，企业开始探索替代方案。Hofseth公司开发的封闭式养殖系统被称为"鸡蛋"，但其成本至少是标准开放式网箱的10倍[1]，这使得推广面临经济障碍。
Norway has become the world's dominant farmed salmon producer through aggressive marketing of salmon sushi globally, now supplying more than half of all Atlantic salmon consumed worldwide.[1] The industry represents the country's second-largest export sector, valued at $18 billion annually and surpassed only by oil revenues.[1] However, this expansion has come at a significant environmental cost to Norway's fjord ecosystems.
The rapid growth of open-net salmon farming has created severe ecological damage in Norwegian waterways.[1] Most farms lack closed bottoms, allowing fish waste and feed to flow directly into fjords, triggering nutrient pollution, harmful algal blooms, and oxygen depletion that have degraded local marine habitats.[1] In Hardanger Fjord, deep-water oxygen levels have declined by one-third since the 1950s.[1] The health of farmed salmon stocks has also deteriorated noticeably: the population of low-grade "production fish" has more than doubled in less than a decade.[1] Researchers have detected pesticide residues even at sites that have remained inactive for two decades.[1]
Addressing these environmental consequences presents significant technical and financial obstacles. Hofseth, a company developing closed-containment farming systems known as "eggs," has created an alternative to standard open-net cages, but the cost of such systems is at least ten times higher than conventional operations.[1]