Skip to Main Content
Movements of nonnative brook trout in relation to stream channel slopeAuthor(s): Susan B. Adams; Christopher A. Frissell; Bruce E. Rieman
Source: Transactions of the American Fisheries Society. 129: 623–638
Publication Series: Scientific Journal (JRNL)
PDF: Download Publication (222 KB)
DescriptionAbstract.We provide new insights on the ability of naturalized brook trout Salvelinus fontinalis to ascend steep, headwater streams in the western USA. We tested hypotheses that upstream movements by brook trout are limited or absent in reaches of steep streams and are more prevalent and longer in gradually sloping streams. We compared brook trout movements in headwater streams in Idaho at sites with varied channel slopes (averages of <1-12%). After eradicating fish from 200-m stream sections, we assessed immigration of marked fish into these sections. Contrary to our hypothesis, upstream movements were more prevalent than downstream movements during the summer, even in steep streams. Marked brook trout ascended stream channels with slopes of 13% that extended for more than 67 m and 22% for more than 14 m; they also ascended a 1.2-m-high falls. Nearly vertical falls, rather than steep slopes per se, apparently inhibited upstream movements. Our hypothesis that upstream movements would decrease with increasing channel slope was partially supported; fish did not move as far upstream in steep as in gradual sites, and upstream movements through steep channels were dominated by larger fish (.135 mmtotal length). Immigration by marked fish smaller than 95 mm was uncommon in all sites. Slopes up to 13% do not ensure against upstream dispersal, although other mechanisms may inhibit brook trout invasion in steep channels. In very steep channels, fewer dispersing fish and slower upstream movement rates may increase the time required for successful invasion and reduce its likelihood of occurrence.
- You may send email to email@example.com 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.
CitationAdams, Susan B.; Frissell, Christopher A.; Rieman, Bruce E. 2000. Movements of nonnative brook trout in relation to stream channel slope. Transactions of the American Fisheries Society. 129: 623–638
- Brook trout movement during and after recolonization of a naturally defaunated stream reach
- Movement of Southern Brook Charr in a North Carolina Headwater Stream
- Have brook trout (Salvelinus fontinalis) displaced bull trout (Salvelinus confluentus) along longitudinal gradients in central Idaho streams?
XML: View XML