Identifying sources and year classes contributing to invasive grass carp in the Laurentian Great Lakes
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Abstract
Relative contributions of aquaculture-origin and naturally-reproduced grass carp (Ctenopharyngodon idella) in the Laurentian Great Lakes have been unknown. We assessed occurrence and distribution of aquaculture-origin and wild grass carp in the Great Lakes using ploidy and otolith stable oxygen isotope (δ18O) data. We inferred natal river and dispersal from natal location for wild grass carp using otolith microchemistry and estimated ages of wild and aquaculture-origin fish to infer years in which natural reproduction and introductions occurred. Otolith δ18O indicated that the Great Lakes contain a mixture of wild grass carp and both diploid and triploid, aquaculture-origin grass carp. Eighty-eight percent of wild fish (n = 49 of 56) were caught in the Lake Erie basin. Otolith microchemistry indicated that most wild grass carp likely originated in the Sandusky or Maumee rivers where spawning has previously been confirmed, but results suggested recruitment from at least one other Great Lakes tributary may have occurred. Three fish showed evidence of movement between their inferred natal river in western Lake Erie and capture locations in other lakes in the Great Lakes basin. Age estimates indicated that multiple year classes of wild grass carp are present in the Lake Erie basin, recruitment to adulthood has occurred, and introductions of aquaculture-origin fish have happened over multiple years. Knowledge of sources contributing to grass carp in the Great Lakes basin will be useful for informing efforts to prevent further introductions and spread and to develop strategies to contain and control natural recruitment.
Study Area
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Identifying sources and year classes contributing to invasive grass carp in the Laurentian Great Lakes |
Series title | Journal of Great Lakes Research |
DOI | 10.1016/j.jglr.2020.07.008 |
Volume | 47 |
Issue | 1 |
Year Published | 2021 |
Language | English |
Publisher | Elsevier |
Contributing office(s) | Columbia Environmental Research Center |
Description | 15 p. |
First page | 14 |
Last page | 28 |
Country | Canada, United States |
State | Michigan, New York, Ohio, Ontario |
Other Geospatial | Cuyahoga River, Grand River, Lake Erie, Lake St. Clair, Maumee River, Niagara River, Portage River, River Raisin, Sandusky River, Welland Canal |
Google Analytic Metrics | Metrics page |