Apparatus and methods for hydrolyzing protein-containing raw material intowater soluble protein and other products. The apparatuses and methods comprisean optional collection or processing stage in which protein-containing rawmaterial, such as fish or animal carcasses from food production plants, arecollected and optionally processed. The raw material is then reacted with oneor more enzymes to hydrolyze the protein present, after which the one or moreenzymes are inactivated and the components separated. The processes andapparatuses, which can be run as a batch processes or, advantageously as acontinuous processes, can yield water soluble protein, oils, bone meal andother products that have utility as food or food additives.
