Publications
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Trawl-based assessment of Lake Ontario pelagic prey fishes including Alewife and Rainbow Smelt
Managing Lake Ontario fisheries in an ecosystem-context, requires reliable data on the status and trends of prey fishes that support predator populations. We report on the community and population dynamics of Lake Ontario pelagic prey fishes, based on bottom trawl surveys. We emphasize information that supports the international Lake Ontario Committee’s Fish Community Objectives. In 2016, 142 bott
Authors
Brian C. Weidel, Maureen Walsh, Michael J. Connerton, Jeremy P. Holden
Electrical guidance efficiency of downstream-migrating juvenile Sea Lamprey decreases with increasing water velocity
We tested the efficacy of a vertically oriented field of pulsed direct current (VEPDC) created by an array of vertical electrodes for guiding downstream-moving juvenile Sea Lampreys Petromyzon marinus to a bypass channel in an artificial flume at water velocities of 10–50 cm/s. Sea Lampreys were more likely to be captured in the bypass channel than in other sections of the flume regardless of elec
Authors
Scott M. Miehls, Nicholas S. Johnson, Alexander Haro
Reconciling catch differences from multiple fishery independent gill net surveys
Fishery independent gill net surveys provide valuable demographic information for population assessment and resource management, but relative to net construction, the effects of ancillary species, and environmental variables on focal species catch rates are poorly understood. In response, we conducted comparative deployments with three unique, inter-agency, survey gill nets used to assess walleye
Authors
Richard T. Kraus, Christopher Vandergoot, Patrick M. KoÄŤovskĂ˝, Mark W. Rogers, H. Andrew Cook, Travis O. Brenden
Asynchrony in the inter-annual recruitment of lake whitefish Coregonus clupeaformis in the Great Lakes region
Spatially separated fish populations may display synchrony in annual recruitment if the factors that drive recruitment success, particularly abiotic factors such as temperature, are synchronised across broad spatial scales. We examined inter-annual variation in recruitment among lake whitefish (Coregonus clupeaformis) populations in lakes Huron, Michigan and Superior using fishery-dependent and -i
Authors
Mitchell T. Zischke, David B. Bunnell, Cary D. Troy, Eric K. Berglund, David C. Caroffino, Mark P. Ebener, Ji X. He, Shawn P. Sitar, Tomas O. Hook
Exploring potential effects of cormorant predation on the fish community in Saginaw Bay, Lake Huron
Stakeholders and fishery managers expressed concern that double-crested cormorant Phalacrocorax auritus predation may be a factor in the recent poor survival of yellow perch Perca flavescens in Saginaw Bay. We quantified cormorant diets from two nesting colonies in Saginaw Bay during April–September in 2013 and 2014, with special emphasis on impacts to yellow perch. Cormorants (n = 691) were colle
Authors
Robin L. DeBruyne, David G. Fielder, Edward F. Roseman, Peter H. Butchko
Feeding ecology of Brook Silverside, Golden Shiner, and Subyearling Pumpkinseed in a Lake Ontario embayment
Fish feeding ecology has been shown to vary over a 24-h period in terms of the prey consumed and feeding intensity. Consequently, in order to best determine the interspecific feeding associations within a fish community, examination of the diet at multiple times over a 24-h period is often necessary. We examined the diel feeding ecology of three fish species that were numerically dominant in a Lak
Authors
James H. Johnson, Marc Chalupnicki, Ross Abbett, Avriel R Diaz, Christopher C Nack
Age and growth comparisons of Hovsgol grayling (Thymallus nigrescens Dorogostaisky, 1923), Baikal grayling (T. baicalensis Dybowski, 1874), and lenok (Brachymystax lenok Pallas, 1773) in lentic and lotic habitats of Northern Mongolia
Despite concern over the conservation status of many Mongolian salmonids and the importance of their ecological role in Mongolia's aquatic ecosystems, little is known about their basic biology. Hovsgol grayling (Thymallus nigrescens) is endemic to Lake Hovsgol, Mongolia and listed as endangered on the Mongolian Red List. Baikal grayling (T. baicalensis) and lenok (Brachymystax lenok) are found in
Authors
Pureviin Tsogtsaikhan, Budiin Mendsaikhan, Ganzorigiin Jargalmaa, Batsaikhanii Ganzorig, Brian C. Weidel, Christopher Filosa, Christopher Free, Talia Young, Olaf P. Jensen
Disease protection and allelopathic interactions of seed-transmitted endophytic pseudomonads of invasive reed grass (Phragmites australis)
Background and aimsNon-native Phragmites australis (haplotype M) is an invasive grass that decreases biodiversity and produces dense stands. We hypothesized that seeds of Phragmites carry microbes that improve seedling growth, defend against pathogens and maximize capacity of seedlings to compete with other plants.MethodsWe isolated bacteria from seeds of Phragmites, then evaluated representatives
Authors
James F. White, Kathryn Kingsley, Kurt P. Kowalski, Ivelisse Irizarry, April Micci, Marcos Antonio Soares, Marshall S. Bergen
It's like night and day: Diel net-effects on Cercopagidae densities in the Laurentian Great Lakes
In the Laurentian Great Lakes, zooplankters are often sampled using standard ≤153 μm mesh nets without regard to the time of day they are collected. We sampled Cercopagidae during 2013–2014 in northern Lake Huron during day, dusk, and night using two different nets (a 0.5 m wide 153 μm mesh “standard” net and a 0.75 m wide 285 μm mesh “Bythotrephes” net) to determine if there were any differences
Authors
Patricia M. Dieter, David B. Bunnell, Jean V. Adams, Nicole M. Watson, Whitney Woelmer
Sparse targets in hydroacoustic surveys: Balancing quantity and quality of in situ target strength data
Hydroacoustic sampling of low-density fish in shallow water can lead to low sample sizes of naturally variable target strength (TS) estimates, resulting in both sparse and variable data. Increasing maximum beam compensation (BC) beyond conventional values (i.e., 3Â dB beam width) can recover more targets during data analysis; however, data quality decreases near the acoustic beam edges. We identifi
Authors
Mark R. DuFour, Christine M. Mayer, Patrick KoÄŤovskĂ˝, Song Qian, David M. Warner, Richard T. Kraus, Christopher Vandergoot
Isotopic structure of Lake Whitefish in Lake Huron: Evidence for regional and local populations based on resource use
Lake Whitefish Coregonus clupeaformis is the most commercially valuable species in Lake Huron. The fishery for this species has historically been managed based on 25 management units (17 in Canada, 8 in the USA). However, congruence between the contemporary population structure of Lake Whitefish and management units is poorly understood. We used stable isotopes of carbon (δ13C) and nitrogen (δ15N)
Authors
Rebecca L. Eberts, Bjorn Wissel, Gavin L. Simpson, Stephen S. Crawford, Wendylee Stott, Robert H. Hanner, Richard G. Manzon, Joanna Y. Wilson, Douglas R. Boreham, Christopher M. Somers
Production and evaluation of YY-male Brook Trout to eradicate nonnative wild brook trout populations
Nonnative Brook Trout Salvelinus fontinalis were introduced throughout western North America in the early 1900s, resulting in widespread self-sustaining populations that are difficult to eradicate and often threaten native salmonid populations. A novel approach for their eradication involves use of YY male (MYY) Brook Trout (created in the hatchery by feminizing XY males and crossing them with nor
Authors
Patrick Kennedy, Daniel J. Schill, Kevin A. Meyer, Matthew R. Campbell, Ninh V. Vu, Michael J. Hansen