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Creator:: Gomez-Gutierrez, Jaime, Feinberg, Leah R., Shaw, Tracy, and Peterson, William T.
Abstract:: We compared brood sizes among adult female Euphausia pacifica Hansen, 1911 from 3 populations in the North Pacific: Puget Sound, Washington, USA; Toyama Bay, Japan; and the Oregon coast, USA. Additionally, we used multiple linear regression models to compare the interspecific brood size as a function of female length and...
Resource Type:: Article
Full Text:: ). Contents of the cod ends of these nets were poured into a cooler with 20 l of sur- face seawater. Mature

Creator:: Feinberg, Leah R., Shaw, C. Tracy, and Peterson, William T.
Abstract:: Gravid adult female Euphausia pacifica were collected off Newport, Oregon, USA and transferred to the laboratory, where females spawned eggs, eggs hatched, and larvae were reared at 10.5 degrees C. We fed 4 cohorts of larvae to excess with a combination of phytoplankton species and monitored them daily until they...
Resource Type:: Article
Full Text:: sorted and placed indi- vidually in 1 l jars of filtered seawater and monitored throughout the night

Creator:: Miller, Charles B., Crain, Jennifer A., and Marcus, Nancy H.
Abstract:: Female calanoid copepods of the family Calanidae can mature with either the juvenile and most typical female pattern of setation, termed trithek (T), or with the male pattern, termed quadrithek (Q). It was suggested by Fleminger (1985), but not proved, that females with the Q pattern have switched from development...
Resource Type:: Article
Full Text:: , Nancy H. Marcus2 1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis

Creator:: Miller, Charles B., Cowles, Timothy J., Wiebe, Peter H., Copley, Nancy J., and Grigg, Helen
Abstract:: Calanus finmarchicus (Gunnerus) stratify narrowly near 500 m depth during their fifth copepodite resting phase in North Atlantic Slope Water off southern New England, USA. They probably achieve this by migration to a specific, daytime isolume. Photoperiod information provided by light intensity at depth could serve as a cure for...
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Full Text:: Charles B. ille er', Timothy J. ~ o w l e s ' , Peter H. w i e b e 2 , Nancy J. copley2, Helen ~ r i g

Creator:: Ryer, Clifford H. and Olla, Bori L.
Abstract:: Research was undertaken to examine the influence of light intensity on the shoaling behavior, activity and anti-predator behavior of juvenile walleye pollock Theragra chalcogramma. Under a 12 h light/12 h dark photoperiod, juveniles displayed a diurnal shoaling and activity pattern, characterized by fish swimming in cohesive groups during the day,...
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Full Text:: Ecol Prog Ser l Published June 18 Effect of light on juvenile walleye pollock shoaling and their

Creator:: Ryer, Clifford H. and Olla, Bori L.
Abstract:: Prior studies have demonstrated that juvenile walleye pollock Theragra chalcogramma forage socially in schools for spatially and temporally clumped food, but forage more independently for spatially and temporally dispersed food. One advantage of social foraging is that fish in schools may be able to locate more food clumps than fish...
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Full Text:: fishes Clifford H. Ryer*, Bori L. Olla Alaska Fisheries Science Center, National Marine Fisheries

Creator:: Ryer, Clifford H. and Bori L., Olla
Abstract:: Walleye pollock and sablefish, as 0+ yr juveniles, are pelagic particulate feeding planktivores. We conducted a series of laboratory experiments to determine how illumination influences prey consumption in these species, utilizing live Artemia sp. as prey. Both juvenile walleye pollock and sablefish were characterized by a sigmoidal relationship between the...
Resource Type:: Article
Full Text:: juvenile planktivorous fish Clifford H. Ryer*, Bori L. Olla Fisheries Behavioral Ecology Group, Alaska

Creator:: Sogard, Susan M. and Olla, Bori L.
Abstract:: Larval and age-0 sablefish Anoplopoma fimbria reside in neustonic waters of the North Pacific during spring and summer. We estimated the potential impacts of elevated surface temperatures on ecological processes of growth, conversion efficiency, and behavior in early juvenile sablefish. Growth experiments tested a wide range of temperatures from 6...
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Full Text:: . Sogard*, Bori L. Olla Alaska Fisheries Science Center, National Marine Fisheries Service, Hatfield

Creator:: Morgan, Cheryl A., Peterson, William T., and Emmett, Robert L.
Abstract:: During the summer of 1994, 1996, and 1997, we conducted hydrographic and plankton surveys of the upper 70 m in the nearshore, the continental shelf, and off shelf oceanic waters off Oregon, USA. Copepod densities and biomass were estimated along 4 transects from each cruise. The on shelf copepod biomass...
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Full Text:: . Peterson2, Robert L. Emmett2 1Cooperative Institute for Marine Resources Studies, Oregon State University

Creator:: Benoit-Bird, Kelly J., Au, Whitlow W. L., Brainard, Russell E., and Lammers, Marc O.
Abstract:: The mesopelagic boundary community off the leeward coasts of 2 Hawaiian Islands, Oahu and Hawaii, was investigated with an echosounder modified to read directly into a laptop computer. Acoustic sampling was conducted over a total distance of 12.6 km off the Waianae coast of Oahu and 46.3 km off the...
Resource Type:: Article
Full Text:: . L. Au1, Russell E. Brainard2, Marc O. Lammers1 1Hawaii Institute of Marine Biology and Department

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