Overhead-Light Intensity and Vertical Positioning of the Walleye, Stizostedion vitreum vitreum

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Abstract
Laboratory experiments were devised to test field observations and eye-histological indications that light may strongly influence the spatial distribution of the walleye (Stizostedion vitreum vitreum). In 48 tests, fish were exposed to sequences of three different light intensities in discrete logarithmic steps, viz. 200, 20, 2 lx, in that and in reversed order. The result was an inverse relation between light intensity and height of fish position in the test tank, with highly significant differences between positions at different intensities. This response may provide the basis for a useful technique to detect sublethal levels of environmental toxicants.

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