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see crustaceancrustacean
, primarily aquatic arthropod of the subphylum Crustacea. Most of the 44,000 crustacean species are marine, but there are many freshwater forms. The few groups that inhabit terrestrial areas have not been particularly successful in an evolutionary sense; most require
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commercial name of planktonic marine crustaceans of the orders Euphausiacea (genera Thysanoessa and Euphausia) and Amhipoda (genus Themisto of the order Hyperioidea).

Krill accumulates mainly on the surface of water in the temperate and frigid zones of both hemispheres. It constitutes the food of whales, pinnipeds, pelagic fishes, and birds feeding on plankton. In winter krill sinks to the bottom where it serves as food for benthic fishes. A krill industry producing feed meal, fat, and food pastes has developed in the antarctic.


(invertebrate zoology)
A name applied to planktonic crustaceans that constitute the diet of many whales, particularly whalebone whales.


any small shrimplike marine crustacean of the order Euphausiacea: the principal food of whalebone whales
References in periodicals archive ?
Similarly, the endogenously produced MUFA 18:ln-9 (oleic acid) is also a major FA in omnivorous or carnivorous zooplankton, including euphausids and amphipods (Falk-Petersen et al.
Likewise, glycine is the major single component in crustaceans when the analyses of both decapods and euphausids are combined.
Temporal and spatial variations in copepod and euphausid biomass offf the southern and south-western coasts of South Africa in 1977/78.
1986) found that while bivalves were dominant in the stomach contents of yellowfin sole during the spring, summer proportions of bivalves dropped considerably and polychaetes, echiurids, euphausids, and crangonid shrimp were most important.