The most successful animal , in terms of biomass , is the Antarctic krill , Euphausia superba , with a biomass of probably over 500 million tons , roughly twice the total biomass of humans . Biomass may also be a measure of the dried organic mass of an ecosystem . Biomass can refer to species biomass , which is the mass of one or more species , or to community biomass , which is the mass of all species in the community .