Ecologists typically model patterns among trophic levels by drawing pyramids. the general name for these pyramids are ecological or trophic pyramids. one more specific type of pyramid is called the pyramid of biomass. this pyramid shows all the biomass at different trophic levels at one point in time. because this ecosystem has only two trophic levels (algae and catfish), it can be represented with a two-tiered pyramid. what ideas do you have about the structure of the biomass pyramid in this pool based on what you already know?