In the aquatic ecosystem, the pyramid of biomass may be inverted. For example, the biomass of zooplanktons is higher than that of phytoplanktons as the life span of the former is longer and the latter multiply much faster though having a shorter life span. A number of generations of phytoplanktons may thus be consumed by a single generation of zooplanktons. Biomass of fish may still be larger as fishes are larger in size with longer life span and a number of generations of zooplanktons can be consumed by fishes. However, during transfer, only 10 % of the biomass of one generation is passed on to the next trophic level.
