This e-module presents the Icelandic Demonstrator activities in AccelWater, led by Matis and the University of Iceland, focusing on two key sectors: whitefish processing and land-based aquaculture of salmon. The module outlines efforts to reduce water and energy use, recover valuable proteins from fish processing water and develop high-value by-products like collagen and bioactive compounds. It also highlights innovative practices such as dry bleeding in aquaculture to reduce water use and recover undiluted blood, as well as the valorization of aquaculture sludge into fertilizer. The demonstration aims to enhance resource efficiency, circularity, and sustainability in the seafood industry.