What structure within the walleye eye reflects incoming light across the retina?

Answer

tapetum lucidum

The tapetum lucidum is a specialized, light-sensitive layer situated behind the retina within the eye structure of many nocturnal or low-light active animals, including the walleye (*Sander vitreus*). Its function is critical for enhanced vision in dim conditions because it reflects any light that has passed through the photoreceptors (rods and cones) back across the retina a second time. This second pass maximizes the capture of available photons, effectively doubling the visual signal processing capability compared to eyes lacking this reflective layer. This adaptation is precisely what grants the walleye its superior ability to hunt successfully during crepuscular hours (dawn/dusk) or in deep, stained waters where light penetration is minimal.

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biology fish characteristic Walleye