Fish Movements in Toronto Harbour Associated with Upwelling Events

Thursday, August 21, 2014: 11:30 AM
2104A (Centre des congrès de Québec // Québec City Convention Centre)
Liset Cruz-Font , Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada
Maxime Veilleux , Biology, Carleton University, Ottawa, ON, Canada
Bogdan Helvca , Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON
Jon Midwood , Department of Biology, Carleton University, Ottawa, ON, Canada
Mathew Wells , University of Toronto, Toronto, ON, Canada
Steven J. Cooke , Biology, Carleton University, Ottawa, ON, Canada
Susan Doka , Great Lakes Laboratory for Fisheries and Aquatic Science, Fisheries and Oceans Canada, Burlington, ON, Canada
Fish habitat selection and movements are influenced by a suite of environmental variables. Water temperature is one of the most studied due to the intrinsic effect of this variable on the biological processes of organisms. Littoral fish are particularly influenced by fluctuations in water temperatures, mainly during the summer where this process is more common. The Toronto Harbour exhibits such temperature fluctuations, or upwellings, with changes of around 10-16oC in relatively short time periods. This type of event can occur several times during the summer, and with different intensities, such that the effects can be spread to relatively protected areas of the inner harbour. Fish that inhabit these areas of the lake have to cope with the rapid changes in temperature; therefore their movements should be influenced by the irregular environmental process. This study explores fish movements in the Toronto Harbour during three upwelling events of 2012. Fish were tagged with acoustic transmitters, released and tracked with an array of receivers that covered the area of the harbour. Water temperatures were recorded throughout the duration of the study. This research will help understand the habitat selection for resident and non-resident fish during environmental disturbances such as the upwelling events