Biomass or biomass (iodine) from the point of view of Ecology refers to the mass of all biological organisms (including plant iodine substances، microalgae and organisms bacterial or fungal) in a given region or ecosystem at a given time. Biomass can refer to the biomass of a species which is the mass of one or more species in consideration، or to the collective and general biomass، which refers to the mass of all species that make up the community. It can include microorganisms - plants or animals. This crime can be expressed as the average mass per unit area of iodine or as the total mass in society. > how biomass is measured depends on the reason for the measurement of iodine. Sometimes biomass is regarded as the natural mass of organisms in situ-exactly as they are. For example, in fisheries, salmon trout biomass Trout possible, as the total wet weight the salmon in the same taken from the water to be considered. In other areas, for., the biomass can be in terms of mass, organic dried the size of the vote. so maybe the real weight of only 30% by weight may account for is the rest of the water. For other purposes-only biological tissues are counted, and teeth - bones and shells are excluded. In some applications iodine biomass is measured as the mass of carbon dependent on iodine substances: "total iodine carbon" (iodine) that exists.