GLOBAL JOURNAL OF FISHERIES SCIENCE
Integrity Research Journals
ISSN: 2782-750X
Model: Open Access/Peer Reviewed
DOI: 10.31248/GJFS
Start Year: 2018
Email: gjfs@integrityresjournals.org
Brown Trout Redd locations in Spearfish Creek, in the City of Spearfish, South Dakota, USA, in the Fall of 2025
https://doi.org/10.31248/GJFS2026.101 | Article Number: 361E69FF3 | Vol.8 (1) - February 2026
Received Date: 11 February 2026 | Accepted Date: 27 February 2026 | Published Date: 28 February 2026
Authors: Grace Boysun , Jill M. Voorhees , Abigail Domagall and Michael E. Barnes*
Keywords: spawning, Brown trout, redds, salmonid.
A naturally-reproducing brown trout (Salmo trutta) population exists in the reach of Spearfish Creek in the city of Spearfish, South Dakota, USA. This study recorded redd spawning locations and environmental factors in three different sections within this reach in 2025. The first redd was observed on 3 October, and the last redds were observed on 7 November. A total of 46 redds were observed in all three sections over the seven-week study period. Peak spawning activity occurred on 24 and 31 October, with 14 and 16 redds observed, respectively. The northernmost (downstream) section had over twice the number of redds as the two upstream sections. In addition, redds in this section were primarily located in two hot spots.
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