Dorsal Light Response as an Index of Prey Preference in Bluegill (Lepomis macrochirus)

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Abstract
An apparatus utilizing the variation in the dorsal light response of sight-feeding planktivorous fish when exposed to prey of various lengths, was used to measure the predator’s interest in particular prey. Comparison of results with actual selection of prey by fish under experimental conditions confirms the importance of prey length in determining the preference of these predators.