Use of the Average and Fluctuating Velocity Components for Estimation of Volitional Rainbow Trout Density

Autor: Mufeed Odeh, Ernest L. Brannon, Bahman Shafii, David L. Smith
Rok vydání: 2006
Předmět:
Zdroj: Transactions of the American Fisheries Society. 135:431-441
ISSN: 1548-8659
0002-8487
Popis: The relationship between discharge and fish density in streams is commonly accepted to be curvilinear, progressing from low discharge and low fish density to a peak and then declining to high discharge and low fish density. Discharge is related to water velocity; in general, as discharge increases velocity increases. Habitat complexity is an important aspect of salmonid ecology; more complex habitats support higher fish densities. Habitat complexity also influences the flow of water through the process of flow separation and turbulence production. More complex habitats generally exhibit higher levels of turbulence even though both may have similar average velocities. We tested whether the physical link between habitat complexity and turbulence was correlated with fish density. Turbulent kinetic energy and average velocity for three different levels of discharge and habitat complexity were measured in a flume. Turbulent kinetic energy was found to predict fish density, whereas average velocity did...
Databáze: OpenAIRE
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