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Preliminary results from an inexpensive motion analyzer for free-swimming zooplankton

Mirrors are used to reflect two orthogonal views of a small aquarium into the lens of a single video camera, thus creating distortion-free, three-dimensional images. Zooplankton motion is quantified with computer software that categorizes different zooplankton behaviors and measures parameters such as distance, duration, angle of movement, and overall swimming speed. Using this system, we have found a strong behavioral response of Diaptomus minutus to the presence of conspecifics; Diaptomus greatly increases swimming speed and frequency of jumps under moderately crowded conditions.