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Knowledge of Spawning Phenology may Enhance Selective Barrier Passage for Wetland Fishes

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Abstract

Within the Laurentian Great Lakes, many native fishes use wetlands for spawning; however, these areas are also used by non-native common carp (Cyprinus carpio) that may impart negative ecological impacts. There is interest in managing common carp using physical barriers to decrease passage to specific habitats (e.g., their spawning sites), but these barriers could also exclude native wetland spawners such as largemouth bass (Micropterus salmoides) and northern pike (Esox lucius). Our objective was to determine if differences in spawning movements could be exploited in shallow areas to operate seasonal barriers that are opened and closed to promote selective fragmentation. Using a long-term dataset from the Cootes Paradise Marsh Fishway (Hamilton, Ontario), we generated predictive models for spawning movements based on cumulative growing degree day (CGDD) for all three fishes. These models successfully predicted earlier arrival by all species in a warmer year and delayed spawning movements during a cold year, highlighting the role of temperature as a driver of interannual variation in spawning movements. We then compared the Fishway model predictions to spawning movements within nearby Toronto Harbour, which were derived from acoustic telemetry data. We found that the model outputs were correlated with movements of all three species, but performance was weakest for northern pike. Resource managers could use these predictive models to assist in the operation of seasonal barriers to decrease access of common carp to spawning sites, while maximizing passage to native fishes.

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Data Availability

The datasets generated during this study are available from the corresponding author upon reasonable request. Telemetry data are available through GLATOS.

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Acknowledgements

We would like to thank staff members of the Toronto and Region Conservation Authority (TRCA) for their support in the field and for planning including Rick Portiss, Don Little, Brian Graham, Brynn Coey, Gord MacPherson, Adam Weir, Pete Shuttleworth, Bradley Bloemendal, Meg St. John, Kaylin Barnes, Matthew Fraschetti, and Ross Davidson (among others). We also thank the members of the Fish Ecology and Conservation Physiology Laboratory at Carleton University including Maxime Veilleux and Andrew Rous. We extend thanks to those working for the Great Lakes Acoustic Telemetry Observation System, especially Nancy Nate. The team at Fisheries and Oceans Canada including Christine Boston, David Reddick, Erin Budgell, Sarah Larocque, and Dallas Linley provided assistance with array maintenance and fish tagging.

Funding

Morgan Piczak and Steven Cooke were supported by the Natural Sciences and Engineering Research Council of Canada. Funding for both TRCA and Carleton University came from the Great Lakes Sustainability Fund. Funding to Jon Midwood and Susan Doka for these projects came from the Great Lakes Action Plan administered by Environment and Climate Change Canada, as well as support from Fisheries and Oceans Canada through the Freshwater Habitat Initiative.

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Contributions

All authors contributed to the study concept and design. Data collection was led by Tys Theÿsmeÿer, Susan Doka and Jon Midwood, with analysis completed by Morgan Piczak with supervision from Steven Cooke. The first draft of the manuscript was written by Morgan Piczak, with all authors providing feedback. All authors read and approved the final manuscript.

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Correspondence to Morgan L. Piczak.

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The authors have no competing interests to disclose.

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Piczak, M.L., Theÿsmeÿer, T., Doka, S.E. et al. Knowledge of Spawning Phenology may Enhance Selective Barrier Passage for Wetland Fishes. Wetlands 43, 72 (2023). https://doi.org/10.1007/s13157-023-01723-1

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  • DOI: https://doi.org/10.1007/s13157-023-01723-1

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