The seafood sector is facing difficulties to meet the increasing demand for product greenhouse gas emission (GHG) assessments. We quantified GHGs of important seafood products of Norway, the world's second largest seafood exporter. We present results and improvement options for products of farmed salmon and wild-caught shrimp, king crab, cod, and herring, followed to their dominating markets, based on detailed data for 2017. To enable more frequent monitoring, without engaging in a full assessment, we then suggest a simplified approach, focusing on the main drivers of production-related emissions. The simplified approach is used to analyze temporal trends from 2007–2017 for fisheries and 1990–2017 for salmon aquaculture. Finally, the simplified approach was compared to the comprehensive assessment for 2017 to define species-specific upscaling factors. Results show that salmon and crustacean products in 2017 caused higher emissions than cod and herring products, with feed and fuel use being the main emission drivers, whereas airfreighted products had the highest emissions of all products. Large improvement potential from average to best performers within each production system exists. The simplified approach shows that the fuel-use intensity of Norwegian fisheries has increased by almost 50% for shrimp over the past decade whereas it has decreased for fish by 20% for demersal species such as cod and 5–10% for pelagic species such as herring. Feed-related emissions for salmon, on the other hand, have increased by almost 30% during the same period, because of an increasing feed conversion ratio and increased inclusion of emission-intensive feed inputs.

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挪威海产品的温室气体排放：从综合评估到简化评估

海产品行业面临着满足日益增长的产品温室气体排放 (GHG) 评估需求的困难。我们对世界第二大海产品出口国挪威的重要海产品的温室气体进行了量化。我们根据 2017 年的详细数据，展示了养殖鲑鱼和野生捕捞虾、帝王蟹、鳕鱼和鲱鱼产品的结果和改进方案，以及它们进入主导市场的情况。为了更频繁地进行监测，而不是进行全面评估，然后我们建议采用一种简化的方法，重点关注与生产相关的排放的主要驱动因素。简化方法用于分析 2007-2017 年渔业和 1990-2017 年鲑鱼养殖的时间趋势。最后，将简化方法与 2017 年的综合评估进行比较，以确定特定物种的升级因子。结果显示，2017 年鲑鱼和甲壳类产品的排放量高于鳕鱼和鲱鱼产品，饲料和燃料使用是主要的排放驱动因素，而空运产品的排放量是所有产品中最高的。每个生产系统中都存在从平均水平到最佳水平的巨大改进潜力。简化方法表明，挪威渔业的燃料使用强度在过去十年中对虾增加了近 50%，而鱼类对鳕鱼等底层物种的燃料使用强度降低了 20%，对远洋物种（例如鲱鱼。另一方面，鲑鱼与饲料相关的排放量在同一时期增加了近 30%，