Attributes of Yellowstone Cutthroat Trout Redds in a Tributary of the Snake River, Idaho
- 1 January 1994
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 123 (1) , 37-50
- https://doi.org/10.1577/1548-8659(1994)123<0037:aoyctr>2.3.co;2
Abstract
We characterized spawning sites of Yellowstone cutthroat trout Oncorhynchus clarki bouvieri, described the microhabitat of completed redds, and tested the influence of habitat conditions on the morphology of completed redds in Pine Creek, Idaho. Cutthroat trout spawned in June as flows subsided after peak stream discharge. During spawning, minimum and maximum water temperatures ranged 4–9°C and 16–20°C, respectively. Trout spawned where water depths averaged 20 cm beside redds and 22 cm upstream of redds. Water velocities averaged 42 cm/s beside redds and 46 cm/s upstream of redds. More than 80% of the redds were constructed in water 10–30 cm deep with velocities of 25–60 cm/s. Trout spawned in gravel with particles up to 100 mm in diameter. Most of the substrate was smaller than 32 mm; an average of 20% was less than 6.35 mm and 5% was less than 0.85 mm. The geometric mean particle size of the spawning gravel averaged 16.6 mm and the fredle index averaged 8. Microhabitat conditions differed with...Keywords
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