krill

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Related to Euphausiid: Chaetognatha

krill:

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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.

Krill

 

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.

krill

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

krill

any small shrimplike marine crustacean of the order Euphausiacea: the principal food of whalebone whales
References in periodicals archive ?
Although defined vertical migration pattern with respect to time of day was not identified, the VDI suggested that euphausiid species were concentrated in the 50-100 m layer during night and day.
Hake and euphausiid acoustic studies in the Strait of Georgia.
This difference in biomass is largely explained by the presence of large oceanic populations of euphausiids (krill), which can account for more than 30% of the zooplankton biomass.
E Brunton confirmed identifications of euphausiids, and EL Bousfield and CT Shih identified the amphipods.
Myctophids consumed, primarily, ostracods offshore (76.4% mean percentage by number [[MN.sub.i]]), euphausiids nearshore (45.0%), and copepods (66.6%) in the intermediate region.
Growth production of the euphausiid Nyctiphanes simplex at the coastal shelf off Magdalena Bay, Baja California Sur, Mexico.
Community structure of euphausiids and copepods in the distribution areas of pelagic fish larvae off the west coast of Baja California, Mexico.
comm., and Juberthie-Jupeau, 1972; Alvinocaris markensis: Chamberlain, 2000); or in which juvenile individuals feature apposition eyes, but adults have superposition eyes (e.g., Panulirus longipes: Meyer-Rochow, 1975; mysids and euphausiids: Nilsson et al., 1986); or in which the dioptric elements are lost and the retina changes from the imaging type to a nonimaging one (bresiliid shrimps: Gaten et al., 1998).
Euphausiid-rich diets may simply reflect the advantage of a body size that enabled the consumption of large euphausiids. However, recent research during late summer indicates that euphausiid populations in the Kodiak region can be substantially denser than in the Shumagin and Semidi regions (senior author, unpubl.
On a larger scale, if euphausiids are expatriates from the northern Pacific and not endemic to the Chukchi and Beaufort seas, then euphausiid presence near Barrow is a function of their transport northward from the Pacific Ocean.
Diets ofthese fishes varied temporally, spatially, and between species, but were dominated by insects, euphausiids, and decapod larvae.