Passage of juvenile cutthroat trout and steelhead through retrofitted culverts Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2v23vx11t

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  • Culverts and road crossings potentially create barriers that impede or prevent movement and migration of all life stages of resident and anadromous fish. There have been very few studies of juvenile salmonid movements through retrofitted (baffled) culverts in the field. Two separate studies were conducted to assess juvenile cutthroat trout (Oncorhynchus clarki) and juvenile steelhead (Oncorhynchus mykiss) movements through retrofitted culverts. A long-term mark-recapture study observed juvenile trout movements through seven different retrofitted culverts. Cutthroat trout and steelhead moved up through three culverts in the field with the longest movement being 284 m upstream through a 84 m long culvert. The steelhead that moved was 107 mm. A short-term manipulative study of movement observed juvenile hatchery steelhead movements within the same culvert during winter and sunmier discharges. Retrofit designs tested included a control (no baffles) and baffles set at 90°, 45°, and 30° to the culvert wall. Juvenile steelhead trout were able to maintain their position within the culvert or move upstream in higher numbers when baffles were installed inside the culvert. Baffles set at 90° to the culvert sidewall had slightly better odds of allowing trout to maintain their position or move upstream when compared to the 30° and 45° angled baffles. This occurred during both summer and winter flows. Juvenile fish were observed following the culvert wall and utilizing small gaps between the baffles and the culvert wall throughout the study. Retrofitting culverts is usually less expensive than full culvert replacement, and can be a quick, temporary fix for culverts that may be barriers to juvenile salmonid movement.
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