There is an increasing focus on the recovery of proteinaceous components from marine biomass. In the future it is expected that more food and feed will come globally from the oceans. A lot of marine biomass is today under-utilized or used for low value products. In other cases, the biomass is from under-utilized marine resources such as seaweed, low trophic species or mesopelagic species. The reason why they are not being used can be due to difficult catching or harvesting methods or due to insufficient availability of processes and infrastructure. Much of this biomass is suitable for human consumption; however, the right processing technologies are not put into place in order to make these products available. In this chapter, the focus will be on marine biomass that is currently of low value or currently wasted, and possible solutions for use of these will be evaluated. An overview of possible products from a variety of marine biomasses is presented, the desired properties of the different products towards specific markets are described and the possibilities of these products becoming a commodity that can be produced in large volumes is evaluated based on technological and market possibilities.