Environmental Biology of Fishes

, Volume 19, Issue 1, pp 73–77

Diel food utilization by woundfin, Plagopterus argentissimus, in Virgin River, Arizona

  • Paul D. Greger
  • James E. Deacon

DOI: 10.1007/BF00002740

Cite this article as:
Greger, P.D. & Deacon, J.E. Environ Biol Fish (1987) 19: 73. doi:10.1007/BF00002740


Woundfin, Plagopterus argentissimus, fed predominantly on simuliid larvae during the day, and shifted to the larger Hydropsyche spp. at night. Ephemeropteran larvae were eaten nearly uniformly throughout the 24 hour period. Mean weight of food consumed varied from 20–40 mg per individual (0.7–2.5% body weight) throughout the 24 h period. Our estimated daily ration of about 8% body weight, at temperatures that varied between 15–25°C, is based upon our measure of mean gut contents over a 24h period, combined with intestinal evacuation rates suggested for other cyprinids in the literature. The relatively continuous feeding pattern suggests a foraging strategy that would minimize competition with other species for food during June, a period of minimum annual food abundance in Virgin River.

Key words

Freshwater fishEndangered minnowDiel feedingForaging strategyFood availability

Copyright information

© Dr W. Junk Publishers 1987

Authors and Affiliations

  • Paul D. Greger
    • 1
  • James E. Deacon
    • 1
  1. 1.Biological SciencesUniversity of NevadaLas VegasU.S.A.