Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 75, Issue 11, Pages 2024-2037Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2017-0356
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Funding
- OTN through a strategic network project grant (NETGP) from the Natural Sciences and Engineering Research Council of Canada (NSERC) [375118-08]
- Canadian Foundation for Innovation (CFI) [13011]
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The stocking of juvenile eels and trap and transport programs of large yellow (American) eels (Anguilla rostrata) were initiated in Ontario to mitigate mortalities observed at hydroelectric darns and to increase escapement from the upper St. Lawrence River and Lake Ontario (Canada). A total of 380 migrating female silver eels (stocked, trapped and transported, and wild) were tagged with acoustic transmitters between 2011 and 2014. Their migration and escapement at the exit of the Gulf of St. Lawrence. the Cabot Strait, were recorded using acoustic receivers. Escapement rates varied between 8.9% and 20.0% annually (mean = 11.4%). A high proportion of stocked eels were detected (N= 27 of 43 detected at Cabot Strait), demonstrating their ability to escape the Gulf. No differences in migration speed or crossing locations at Cabot Strait were found among the three categories. Eels crossing Cabot Strait did not display diel and tidal patterns, but their estimated swimming depth indicated diel vertical migrations. The low escapement rates observed may be related to predation events and (or) the low and variable detection efficiency of the acoustic receivers' line.
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