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Related to Euphausiid: Chaetognatha


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 ?
E Brunton confirmed identifications of euphausiids, and EL Bousfield and CT Shih identified the amphipods.
High abundance Pacific hake schools were often close to high abundance euphausiid patches when these aggregations were close to the shelf-break, but this pattern of overlap was far less obvious along portions of transects further offshore.
Abstract: The zooplankton community structure, including copepods, euphausiids, chaetognaths, and decapod larvae, was monitored during six circadian cycles using Bongo net (500 [micro]m mesh net) samples from Bahia Magdalena, on the southwest coast of Baja California, Mexico.
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.
Predictor variable Type of variable Longitude Spatial Latitude Spatial Myctophid species Biological Myctophid standard length Biological Ostracod zooplankton (ZP) Biological composition Copepod ZP composition Biological Euphausiid ZP composition Biological Zooplankton volume Biological Mixed layer depth (MLD) Oceanographic Sea surface salinity (SSS) Oceanographic Sea surface temperature (SST) Oceanographic Surface chlorophyll (SCHL) Oceanographic Predictor variable Mean (Min.
Community structure of euphausiids and copepods in the distribution areas of pelagic fish larvae off the west coast of Baja California, Mexico.
Eight groups accounted for 95% of total abundance both in January (copepods, chaetognaths, euphausiids, amphipods, polychaetes, pteropods, fish larvae and decapods) and May (copepods, amphipods, chaetognaths, euphausiids, decapods, pteropods, fish larvae and gasteropods).
In the Shumagin region, the proportional weight of euphausiids increased from 36% in LSum00 to 64% in Sum01; subsequently, in LSum01, 51% of the stomach contents were euphausiid juveniles and adults and 40% were fish.
For example, the range of euphausiid electivity values observed may be due to the pooling of euphausiid species and life-history stages, potentially obscuring euphausiid prey selection patterns observed in other studies (Schabetsberger et al.
Daylight collection, and the use of a ring net, likely resulted in underestimating euphausiid absolute abundances.
These indices are both lower than the 86% (55 of 64 whales) of bowhead stomachs that held over 50% euphausiid contents reported by Lowry et al.