Abstract: An extruded animal feed comprising minimally dewatered microalgal biomass and a porous mineral is disclosed. The livestock feed comprises a mixture of the porous mineral, such as zeolite, and a whole algal biomass containing between 2.0% to 15.0% solids. The whole algal biomass and the porous mineral are mixed together at a ratio of 1 part whole algal biomass to between 1 to 3 parts porous mineral. The extruded mixture can be formed by extruding the whole algal biomass and the porous mineral together, with or without additional ingredients. The extruded mixture of whole algal biomass and the porous mineral can be delivered as a feed supplement or can be further processed into a final feed composition. The feed supplement may comprise: Zeolite 2.5% to 12%; Microalgal biomass 1.0% to 7.5%; Flax between 40% to 60%; and a dry feed composition between 35% to 55%.