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(invertebrate zoology)
An order of Crustacea commonly included in the Entomostraca; contains free-living, parasitic, and symbiotic forms.



an order of invertebrate animals of the class Crustacea. Copepoda are from 0.1 to 13 mm in size. A streamlined body with strongly developed extremities, which carry long falling antennules, is characteristic for Copepoda living mainly in the water, whereas Copepoda living near the bottom have thickened bodies and short extremities. Parasitic Copepoda have strongly adapted bodies in accordance with their modes of existence. Copepoda show various colorations. Specific (copepodan) stages of metamorphoses are characteristic of the Copepoda; they occur after the nauplius stage. Copepoda are distributed everywhere, in sea and fresh water. In the sea they constitute up to 90 percent of the plankton. Copepoda, particularly the large types of the calanides (Calanus finmarchicus, C. plumchrus, Eucalanus bungii, Pseudocalanus elongatus, and others) and the cyclopeds (Oithinia similis), have great practical significance, as feed for many commercial fish (herring, sardines, anchovies, and sprats) and for the young of almost all fish. In addition, Copepoda feed the baleen whale. A genus of Copepoda (the Cyclopes) are the intermediate hosts for certain worms (tapeworms and round worms) that are parasitical to humans and can cause serious illnesses, such as guinea worm. Certain maritime Copepoda are parasites on worms, ascidians, fish, and whales. The freshwater varieties are parasites on fish and often cause massive kills in the pond and lake fish industry.


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V. A. Dogel’. Zoologiia bespozvonochnykh, 5th ed. Moscow, 1959.


References in periodicals archive ?
Off Concepcion in central southern Chile, upwelling becomes intense in the spring-summer (Sobarzo et al, 2007), although copepods dominate the zooplankton community year-round over the continental shelf (Escribano et al, 2007).
Ergasilid copepods are found on the body surface, gills and bronchial and nasal cavities of many fish species including sea bass, grouper, mullet, pearl spot, and tilapia, where it feeds on the blood and epithelium [14].
in the MIT-WHOI Joint Program in Oceanography and to follow my interests in studying the copepods relationship with Vibrio and other bacteria.
4] for several reasons: (1) cladocerans are generally more sensitive to copper than copepods (Wong et al.
Spatial distribution of copepods in the north of the Humboldt Current region off Chile during coastal upwelling.
In spring, the most frequent (>70% of all collected samples) zooplankton taxa were Keratella cochlearis, Keratella quadrata, Polyarthra dolichoptera, Chydorus sphaericus, and copepodites and nauplii of cyclopoid copepods (Table 1).
We then exposed groups of 5 Nile tilapia, fathead minnows, or mosquitofish (Gambusia affinis) to groups of 50 copepods (Table).
We use available RNA-sequencing (RNA-seq) data from 12 species of ecologically and taxonomically diverse copepods to identify expressed phototransduction genes.