This e-module introduces the Icelandic Demonstrator activities in AccelWater, led by Matis and the University of Iceland, focusing on two areas: whitefish processing and land-based aquaculture of salmon. In the whitefish segment, the project explores protein recovery from processing water, particularly from filleting and waterjet cutting stages, highlighting the potential for producing collagen hydrolysates. Real-time monitoring and improved water management offer substantial water-saving opportunities. The aquaculture section addresses reducing water use during fish bleeding through dry bleeding techniques and valorizing aquaculture sludge into nutrient-rich fertilizer. Together, these innovations promote sustainability, circularity, and resource efficiency in the seafood sector.