Document Type

Article

Journal/Book Title/Conference

Transactions of the American Fisheries Society

Volume

121

Issue

3

Publisher

American Fisheries Society

Publication Date

1992

First Page

395

Last Page

398

DOI

10.1577/1548-8659(1992)121<0395:VFBJBL>2.3.CO;2

Abstract

Young-of-the-year Bear Lake sculpin Cottus extensus feed throughout the day on benthic invertebrates and cease feeding at night when they migrate to the metalimnion. We investigated their reliance on vision by conducting feeding trials at different light levels in the laboratory. Feeding rate reached a maximum at intermediate light levels (near 10^16 photons sm^–2 ss^–1; approximately 1 lux) but decreased as light intensity increased beyond this range. At this maximum rate, the fish fed nine times faster than they were able to feed in the dark, showing that young Bear Lake sculpin rely heavily upon vision to feed. The light intensity at which feeding was greatest corresponded to intensities found on the bottom of Bear Lake (40–60 m) during the day.

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