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Description: |
16 pages : illustrations, charts ; 26 cm |
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Bibliography Note: |
Includes bibliographical references (pages 15-16). |
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Summary, Etc. Note: |
Abstract: A recording white-line depth sounder was used to study annual fish distribution in two deep reservoirs on the White River, Arkansas and Missouri. Varying seasonal activity levels of fish, attenuation of sound beam at depths over 100 feet, and lack of precision in the identification of echo traces precluded rigorous intrepretation of echograms. The inherent picture sense of echograms provided seasonal perspectives of fish distributed with respect to (1) diel movement, (2) depth and basin location, (3) limnetic concentrations, and (4) oxygen-temperature conditions. Scattering layers associated with planktonic chaoborid populations and suspected chemical constituents were disclosed in one of the reservoirs undergoing initial filling. |
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Action Note: |
will digitize $c 20140129 $z Queued for digitization January 29, 2014 $2 pda $5 miu |