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Zooplankton zooplankton are small animals that occur in the water column of either marine or freshwater ecosystems Zooplankton are a diverse group defined on the basis of their size and function, rather than on their taxonomic affinities Most species in the zooplankton community fall into three major groups — crustacea, rotifers, and protozoas Crustaceans are generally the most abundant. The most common zooplankton in the ocean are the crustaceans, which include the crabs, shrimp, and lobsters, and account for about 70% of all zooplankton Herbivore an herbivore is an animal that eats plants as its primary source of sustenance However, many animals are not exclusively herbivorous In addition to feeding mostly upon live plants. Xylem a tissue that transports water and dissolved mineral nutrients in vascular plants In flowering plants it consists of hollow vessels that are formed from cells (vessel elements) joined end to end The end walls of the vessel elements are perforated to allow the passage of water In less advanced vascular plants, such as conifers and ferns, the constituent cells of the xylem are called. Trophic levelstrophic levels describe the various stages within ecological food chains or webs Source for information on trophic levels The gale encyclopedia of science dictionary. The zooplankton are in turn fed upon by larger zooplankton, small fish, and some whales Larger fish eat the smaller ones. Primary producers are able to utilize photosynthesis to create organic molecules from sunlight, water, and carbon dioxide [1]. Food habit studies conducted on 35 bowhead whales (21 males and 14 females) harvested between 1975 and 1989 indicated that bowheads feed on crustacean zooplankton, particularly euphausiids and copepods. The animals, or zooplankton, that eat them may also be tiny, like krill, or they may be larger, like jellyfish, and able to make small, directed motions The active swimmers that inhabit the open ocean are called nekton While the vast majority of nekton are fish and mammals, they include invertebrates, such as mollusks and crustaceans. Get information and homework help with millions of articles in our free, online library.