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.
Use of an ELISPOT immunoassay to detect euphausiid
predation on larval anchovy.