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MARCH 2-5, 2021

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5/21/2018 | 2:30 PM - 2:45 PM | RESTORATION OF A COASTER BROOK TROUT POPULATION AND A SPAWNING SITE IMPACTED BY FINE SEDIMENTS | 430 B

RESTORATION OF A COASTER BROOK TROUT POPULATION AND A SPAWNING SITE IMPACTED BY FINE SEDIMENTS

Adfluvial Brook Trout Salvelinus fontinalis, commonly known as coasters, were an important fisheries in Lake Superior until their abundance and distributions greatly declined by the early 1900s. The Salmon Trout River, Marquette County Michigan, is the south central Lake Superior tributary known to maintain a remnant breeding population of adfluvial coaster Brook Trout. Visual counts of coasters in spawning areas reveal a critically small number of adults with 134 ± 68 (SD) detected annually 2006-2016 across all identified spawning sites. Watershed degradation and resulting sedimentation likely limits current population recovery. Since 2004 fine sediment in the streambed substrates of the once primary spawning site have increased 3-4 fold, up to 98% sand. Because this site is low gradient, sand aggradation has been greater than at the other spawning sites, proportionately fewer adults are now aggregating at this site during spawning season. In 2013 we hydraulically removed sand from this spawning site and the subsequent counts of active redds increased 4-fold (4 to 16). Electrofishing surveys the following summer revealed increased juvenile Brook Trout densities in the site, motivating us to continue this restoration activity.

Sediment
Disturbance
Restoration

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Presenters/Authors

Casey Huckins (), Michigan Technological University, cjhuckin@mtu.edu;