Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): R. Knapp; K. Matthews
    Date: 1996
    Source: North American Journal of Fisheries ManaKenient 16:805-820
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (1.76 MB)


    Impacts of livestock grazing on California golden trout Oncorhynchus rnykiss aguabonita and their habitat were studied inside and outside of livestock exclosures in the Golden Trout Wilderness, California. In two consecutive years, the majority of stream physical characteristics showed large differences between grazed and ungrazed areas, and the directions of these differences were consistent with the recovery of exclosed streams and riparian areas from impacts caused by livestock grazing. Ungrazed areas consistently had greater canopy shading, streamdepths, and bank-full heights and smaller stream widths than grazed areas. California golden troutwere very abundant in the study sites; their densities and biomasses were among the highest ever recorded for stream-dwelling trout in the western United States. California golden trout density and biomass per unit area were significantly higher in ungrazed than in grazed areas in three off our comparisons. Differences between grazed and ungrazed areas were less consistent when density and biomass were calculated on the basis of stream length. Our results suggest that current levels of livestock grazing are degrading the stream and riparian components of the study meadowsto the detriment of golden trout populations

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Knapp, R. and K. Matthews. 1996. Livestock grazing, golden trout, and streams in the golden trout wilderness, California: Impacts and management implications. North American Journal of Fisheries ManaKenient 16:805-820.


    golden trout, oncorhynchus rnykiss aguabonita

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page