Animal morphology, Ecosystem dynamics, Ecosystems, Trophic levels, Zoology, Animal anatomy, Biology, Food webs, Biomass, Freshwater fishes, Lentic systems, Animal scales, Predators, Fish scales, Plankton, Fish, Phytoplankton, Marine biology, Ecology, Freshwater ecosystems, Trophic dynamics, Animals, Trophic relationships, Biological sciences, Aquatic organis...