Crustaceans, especially copepods, dominate the zooplankton. Prey include crustaceans, bivalves, worms and copepods. The zooplankton includes copepods, cladocerans and protozoans. The diet consists of mostly zooplankton which includes copepods, amphipods, and many other crustaceans. Polyp prey includes plankton such as copepods and fish larvae. Particularly important groups of zooplankton are the copepods and krill. Its food consists of crustacean larvae, small copepods, diatoms, algae and detritus. Other accidental or opportunistic consumption of copepods and amphipods have been documented. Polyp prey includes copepods and fish larvae. Microscopic adult marine crustaceans include some copepods, cladocera and tardigrades (water bears). Its food consists of small schooling fish, squid, and crustaceans including copepods and krill. Generally, the "A. ocellaris" feed on algae, copepods, and zooplankton. Possible parasites include nematodes, copepods, protozoa, and helminths. Spring produces blooms of swarming phytoplankton which provide food for copepods. Their diets consist of a variety of copepods, small crustaceans, and small fish.