Pyramid of Biomass:
It is a graphical representation of the trophic structure and function of an ecosystem in term of biomass.
In most ecosystems, the pyramid of biomass is upright i.e., producers are more in biomass than the herbivores and the herbivores are more in biomass than the carnivores.
But, there is an exception:
The pyramid of biomass in sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton.