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Fishway Use by Native and Non-Native Lampreys (Petromyzontidae)


Abstract - A video-based fishway monitoring system was used to count migrating salmonids that inadvertently transported Silver Lampreys Ichthyomyzon unicuspis and Sea Lampreys Petromyzon marinus upstream through a nature-like fishway that maintains connectivity between Lake Huron and the Beaver River, Ontario.  Rainbow Trout Oncorhynchus mykiss transported only Silver Lampreys from March to May with mean monthly water temperatures ranging from 6.8 15.6 oC.  Chinook Salmon Oncorhynchus tshawytscha  transported both Silver Lampreys and Sea Lampreys upstream from August (mean temp = 22.6 oC) to October (mean Temp = 9.0 oC).  Transportation rates were low and ranged from 0.08 % for Rainbow Trout with Silver Lampreys and 0.27 % and 0.61 % for Chinook Salmon that transported Silver Lampreys and Sea Lampreys, respectively.  Rainbow Trout with Silver Lampreys and Rainbow Trout with scars took significantly longer to pass compared with Rainbow Trout with no lampreys attached or scars. Chinook Salmon with Sea Lampreys had reduced swimming performance and took significantly longer to pass upstream than fish that transported Silver Lampreys and fish with no lampreys or lamprey scars. This was likely related to bioenergetic consequences of parasitism coupled with increased drag coefficients and increased hydrodynamic resistance; however, this did not preclude successful fishway use.


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