![]() The smallest zooplankton are single-celled protozoans, also called microzooplankton, which eat the smallest phytoplankton cells in the ocean. ![]() Included in this group are jellyfish and comb-jellies (see below), plus some worms, mollusks, and chordates. Another major category is the gelatinous zooplankton or jellies, unrelated groups that all have soft, transparent bodies and spend much of their life drifting in the water column. A major category of zooplankton is crustaceans, both the larval form of larger animals such as crabs and shellfish, and smaller, floating crustaceans that are an abundant and critical food source for larger animals. Most zooplankton spend their entire lives drifting, but the larvae of many fish and bottom-living animals, before they develop adult forms, are also part of this group. Zooplankton live virtually everywhere in the ocean, but the largest number are in the upper ocean, where there is enough sunlight to support phytoplankton, the first link in the food chain and food for many zooplankton. These include a wide range of animals, from primitive protozoans to the larvae of more complex animals and range in size from microscopic organisms to some of the longest animals in the sea. They are generally either very small animals (and therefore weak swimmers) or large but soft-bodied (and also, therefore, weak swimmers) that are of swimming long distances or against currents like fish, squid, or marine mammals. Zooplankton are animals that live all or part of their life as plankton (from the Greek word for “drifting”) suspended and drifting in fresh or salt water rarely, if ever, coming in contact with hard surfaces. Other Expeditions Highlighting WHOI Research.Expedition to Stellwagen Bank National Marine Sanctuary.How do polynyas help feed emperor penguins?.Why is pressure different in the ocean?.What’s the difference between climate and weather?.
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