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Efficacy of three Denil fish ladders for low-flow fish passage in two tributaries to the Blackfoot River, Montana

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dc.contributor.authorSchmetterling, D A
dc.contributor.authorPierce, R W
dc.contributor.authorLiermann, B W
dc.date2023-09-23T05:06:28.000
dc.date.accessioned2024-04-26T17:22:44Z
dc.date.available2024-04-26T17:22:44Z
dc.date.issued2002-01-01
dc.description.abstractWe evaluated the efficacy of three Denil fish ladders retrofitted to three irrigation diversions in two tributaries to the Blackfoot River, Montana. Fish ladders were 2.4-6.1 m long, with slopes of 9.6-15.8% and mean velocities of 18-140 cm/s. We captured west-slope cutthroat trout Oncorhynchus clarki lewisi, brown trout Salmo trutta, bull trout Salvelinus confluentus, and slimy sculpins Cottus cognatus upstream of the fish ladders (treatment groups), and in three nearby stream reaches without a ladder (control groups). Fish were marked and then released downstream of the fish ladders (treatment) or immediately downstream of their capture reaches (control). Fish lengths were similar between treatment and control sites (t-tests P > 0.05). We resampled the reaches 5-7 d after marking and recaptured similar numbers of marked westslope cutthroat trout and brown trout in both treatment and control sections (chi(2) = 0.13; df = 2; P = 0.94). No slimy sculpins were recaptured in treatment or control sections. Lengths of recaptured westslope cutthroat trout ranged from 92 to 305 mm after the trout ascended the ladders and were similar to lengths of marked fish in those sections (t-tests; P > 0.05). Although it was the longest, the fish ladder with the lowest slope and velocities appeared to limit small (<300 mm) brown trout movement. Recaptured brown trout in the treatment reach were significantly larger (P = 0.05; range = 215-352 mm) than marked brown trout. Fish ladders on irrigation diversions require frequent maintenance. When we evaluated the three structures, only one was operating correctly. Nevertheless, the ladders demonstrate promise for passing small stream-resident or juvenile fishes over irrigation diversions
dc.description.pages929-933
dc.identifier.urihttps://hdl.handle.net/20.500.14394/27804
dc.relation.ispartofNorth American Journal of Fisheries Management
dc.source.issue3
dc.source.issue22
dc.source.statuspublished
dc.subjectBrown trout
dc.subjectdenil
dc.subjectdiversion
dc.subjectfish ladder
dc.subjectfish length
dc.subjectfish passage
dc.subjectirrigation
dc.subjectjuvenile
dc.subjectmarking
dc.subjectsalmo trutta
dc.subjectslope
dc.subjectstructures
dc.subjecttrout
dc.subjectupstream
dc.titleEfficacy of three Denil fish ladders for low-flow fish passage in two tributaries to the Blackfoot River, Montana
dc.typearticle
dc.typearticle
digcom.contributor.authorSchmetterling, D A
digcom.contributor.authorPierce, R W
digcom.contributor.authorLiermann, B W
digcom.identifierfishpassage_journal_articles/266
digcom.identifier.contextkey2447543
digcom.identifier.submissionpathfishpassage_journal_articles/266
dspace.entity.typePublication
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