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Filtering by: Creator Olla, Bori L. Remove constraint Creator: Olla, Bori L. Decade 1990-1999 Remove constraint Decade: 1990-1999 Non-Academic Affiliation Hatfield Marine Science Center Remove constraint Non-Academic Affiliation: Hatfield Marine Science Center

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Effect of light on juvenile walleye pollock shoaling and their interaction with predators

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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Article
Altered search speed and growth: social versus independent foraging in two pelagic juvenile fishes

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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Article
Food deprivation affects vertical distribution and activity of a marine fish in a thermal gradient: potential energy-conserving mechanisms

Creator:

Sogard, Susan M. and Olla, Bori L.

Abstract:

The effects of reduced food availability on the behavior of juvenile walleye pollock Theragra chalcogramma were examined in laboratory experiments designed to test for potential energy-conserving responses. Groups of juvenile fish were held on 1 of 6 ration treatments ranging from ad libitum to near starvation, and then vertical distribution...

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Article
Comparison of growth, behavior and lipid concentrations of walleye pollock Theragra chalcogramma larvae fed lipid-enriched, lipid-deficient and field-collected prey

Creator:

Davis, Michael W. and Olla, Bori L.

Abstract:

While growth and survival of marine fish larvae in the sea may be dependent on prey type, size and concentration, nutritional quality of prey may also play an important role. This study investigates the relationships of lipid content of prey with growth, gas bladder size, sinking rate, behavior and survival...

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Article
Comparison of Predator Avoidance Capabilities with Corticosteroid Levels Induced by Stress in Juvenile Coho Salmon

Creator:

Olla, Bori L., Davis, Michael W., and Schreck, Carl B.

Abstract:

The relationship between predator avoidance deficits induced by a simple handling stress and the level of plasma corticosteroids was determined for juvenile coho salmon Oncorhynchus kisutch. Groups of fish were held out of water for 1 min, then allowed to recover from this stress for 1, 90, or 240 min....

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Article
Effects of physical factors on the vertical distribution of larval walleye pollock Theragra chalcogramma under controlled laboratory conditions

Creator:

Olla, Bori L. and Davis, Michael W.

Abstract:

This study examined, under controlled laboratory conditions, behavioral responses of larval walleye pollock (4 to 8 mm) to various physical factors that may potentially play a role in vertical movements and distribution. Diel periodicity in vertical distribution was evident and appeared to be under exogenous control. During the day, with...

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Creator

Olla, Bori L.[remove]6
Davis, Michael W.3
Ryer, Clifford H.2
Schreck, Carl B.1
Sogard, Susan M.1

Date

Date range begin – Date range end

Current results range from 1990 to 1998

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Decade

1990-1999[remove]6

Language

English [eng]6

Non-Academic Affiliation

Hatfield Marine Science Center[remove]6

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Yes6

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Article6

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Copyright Not Evaluated5
In Copyright1

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