The food chain of this biome consists of tertiary consumers preying on carnivorious zooplankton, secondary consumers preying on zooplankton, and not many herbivores due to the depth of the zones. Their arent any living organisms in the bottoms zones of these biomes, for this reason not many plants exist.The organisms that make their home in the pelagic zone can be divide into three types, phytoplankton, zooplankton and nekton. Phytoplankton ,these primary producers are the basis of the ocean's food chain. Like plants, phytoplankton are autotrophs, able to produce their own food by photosynthesis, but they also need nutrients such as salts and minerals from ocean water. Some principle types of phytoplankton are cyanobacteria, diatoms and dinoflagellates. Zooplankton are animal-like plankton are heterotrophs, meaning they are unable to produce their own food. Zooplankton include protozoa, krill, and the larval stages of many crustaceans, worms, mollusks, fish and other marine animals. Zooplankton feed on phytoplankton. Nekton are organisms that are capable of freely swimming rather than drifting with the current are known as nekton. This category includes crustaceans, mollusks, fish and marine mammals and reptiles