Acoustic estimates of abundance and distribution of spawning lake trout on Sheboygan Reef in Lake Michigan

Warner, David M.; Claramunt, Randall M.; Janssen, John; Jude, David J.; Wattrus, N. J.

doi:10.1016/j.jglr.2008.11.005

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…At Lake Bluff Reef, suitable spawning substrate included a large patch of fractured bedrock debris crowning the summit of the reef (Figures 4a and 7a), while at Gumby's Reef, this patch (Figure 4c) partially encircled the summit at the base of cliff‐like scarp faces. This finding matches other deep‐water observations by Warner et al (2009) in which the highest densities of lake trout observed using hydroacoustics at Sheboygan Reef, Lake Michigan, were over the shallowest point of the reef, composed of rubble and cobble substrate.…”

Section: Discussionsupporting

confidence: 91%

“…Though they may spend the rest of the year dispersed across different regions and depths, in October and November, lake trout converge onto spawning grounds (Ivanova et al, 2021) and show strong interannual spawning site fidelity (Binder et al, 2016). At a finer scale, even amongst vast areas of habitat, lake trout tend to select small, discrete hotspots where spawning activity takes place (Binder et al, 2018; Warner et al, 2009). In this study, lake trout observed on underwater video tended to be associated with the shallowest part of the reef, on or near the steepest slopes, and directly on or in the vicinity of the largest patches of suitable spawning substrate while being largely absent from surrounding areas nearby.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of fish spawning habitat at offshore reefs in southwest Lake Michigan using side‐scan sonar and underwater video

Stacy‐Duffy,

Redman,

Roswell

et al. 2024

Aquatic Conservation

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Offshore reefs in the Laurentian Great Lakes provide critical spawning habitats for native lake trout. Though many historic spawning reefs have been documented, thorough evaluation of the habitat they contain is rare. After decades of stocking, natural recruitment of lake trout has increased dramatically in the Illinois waters of Lake Michigan since 2010, reinforcing the need for information about the viability and distribution of spawning habitats. Using side‐scan sonar and underwater video, this study sought to map bottom substrates at Lake Bluff Reef and Gumby's Reef, offshore of the northern Illinois coast of Lake Michigan, to describe and quantify the availability of substrates suitable for lake trout spawning. Substrates were manually delineated in ArcGIS using side‐scan sonar imagery mosaics. Underwater video was used to verify substrate classifications through direct observation. Suitable spawning substrate consisting of fractured bedrock debris and piled boulder/cobble was observed at both reefs. Underwater video revealed the presence of lake trout at both reefs in the weeks leading up to the spawning season. The largest congregation of fish was observed in the vicinity of the shallowest points, steep slopes, and the largest patches of spawning substrate. The distribution, amount, and condition of spawning substrate available at each reef was in line with others studied in the region and their likely importance for lake trout spawning was reinforced by observed aggregations of mature fish. This study has expanded the inventory of well‐documented offshore reefs in the Illinois waters of Lake Michigan, enhancing appreciation of what is coming to be understood as the Illinois Reef Complex. Knowledge of the distribution and status of habitats critical to the life history of native fishes in the Great Lakes are necessary for managers to properly assess, manage, and conserve lake trout and other fish populations.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Evaluation of fish spawning habitat at offshore reefs in southwest Lake Michigan using side‐scan sonar and underwater video

Stacy‐Duffy,

Redman,

Roswell

et al. 2024

Aquatic Conservation

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show abstract

“…Judas techniques may be useful for other species. For example, spawning aggregations of lake trout Salvelinus namaycush (Walbaum) (Warner et al. 2009) might be located and targeted using Judas fish to control these invasive fish in western lakes (Ruzycki et al.…”

Section: Discussionmentioning

confidence: 99%

“…Judas techniques may be useful for other species. For example, spawning aggregations of lake trout Salvelinus namaycush (Walbaum) (Warner et al 2009) might be located and targeted using Judas fish to control these invasive fish in western lakes (Ruzycki et al 2003). Similar techniques might be also explored for the Asian carp Hypophthalmichthys sp., which also appear to shoal (D. Chapman, US Geological Survey, personal communication).…”

Section: Discussionmentioning

confidence: 99%

Using the Judas technique to locate and remove wintertime aggregations of invasive common carp

Bajer

Chizinski

Sorensen

2011

Fisheries Management Eco

115

105

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Radio‐ and acoustic telemetry in three Midwestern lakes demonstrated that common carp, Cyprinus carpio L., aggregate as water temperatures descend below 10 °C. Particularly dense aggregations formed at temperatures <5 °C, and once located, these aggregations could be removed with an efficiency of up to 94% using seine nets. Carp aggregated just below the surface of the ice (approximately 1.5 m) and rarely descended to warmer waters, which extended down to 10 m. Although aggregations consistently formed close to shore, their locations could not be explained by temperature or dissolved oxygen. The aggregations also moved frequently, making radio‐tagged fish invaluable to locate them. Coldwater aggregations of carp may reflect a type of shoaling behaviour and can be exploited with the aid of radio‐tagged (Judas) fish to control this invasive fish effectively. Similar approaches might be developed for other gregarious invasive fishes.

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Habitat

Marsden

Binder

Riley

et al. 2021

The Lake Charr Salvelinus Namaycush: Biology, Ecology, Distribution, and Management

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Acoustic estimates of abundance and distribution of spawning lake trout on Sheboygan Reef in Lake Michigan

Cited by 7 publications

References 20 publications

Evaluation of fish spawning habitat at offshore reefs in southwest Lake Michigan using side‐scan sonar and underwater video

Evaluation of fish spawning habitat at offshore reefs in southwest Lake Michigan using side‐scan sonar and underwater video

Using the Judas technique to locate and remove wintertime aggregations of invasive common carp

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