The large carnivorous fish eating the smaller carnivorous fish is an example of predation, the shrimp eating the animal plankton is also an example of predation, and the nematodes and the various fish are examples of parasitism. The biomass is when the top three consumers in the ecosystem consume the organisms that are considered prey they would have less energy because the higher the relations get and the more they consume all the energy that the prey started out with would be either released or decomposed already.