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Very likely Daphnia or another zooplankter or groups of several species. They have a diurnal (daily) migration moving toward the surface at night and downward during the day or bright light. http://www.merriam-webster.com/dictionary/diurnal
Last edited by Bill Cody; 02/16/15 02:32 PM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management
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