Targeted surveys for channel darter and round goby along the Trent, Moira, Salmon, and Napanee rivers in 2021 / by Anita LeBaron and Scott M. Reid.: Fs97-13/1363E-PDF

"The spread of the invasive Round Goby (Neogobius melanostomus) was assessed as a significant threat to those populations of Channel Darter (Percina copelandi) identified by the Committee on the Status of Endangered Wildlife in Canada as the Lake Ontario designatable unit. However, expert-based threat assessments require validation through field research and monitoring. In 2021, electrofishing surveys to detect and monitor the two species were undertaken along four Lake Ontario tributaries: the Trent River (9 sites), Moira River (1 site), Salmon River (15 sites), and Napanee River (6 sites). Surveys were also undertaken at two sites along Depot Creek, a Napanee River tributary. A total of 60 Channel Darter and 238 Round Goby were electrofished from all sites. Channel Darter was detected at five Trent River sites and six Salmon River sites; Round Goby was detected at nine Trent River sites and one Napanee River site. Round Goby co-occurred with Channel Darter at five sites (Trent River). Angling surveys to detect Round Goby were also undertaken across five waterbodies representing potential baitfish introduction sites within the Trent River, Salmon River, and Napanee River watersheds: Crowe Lake (25 sites), Beaver Lake (24 sites), Varty Lake (24 sites), Rylstone Lake (10 sites), and Crowe River (6 sites), as well as 8 reference sites on the Trent River. Round Goby was only detected at reference sites"--Abstract, page vi.

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