Filters: Tags: fish movement (X)
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Barriers to upstream fish movement (either long-term geologic, natural short-term, or anthropogenic barriers) will be used to assess whether individual stream segments are currently occupied by bull trout, for assessing risk of genetic introgression or disease to existing bull trout populations, or whether existing subpopulations are connected with other subpopulations. Only those barriers that are believed to have a significant influence bull trout distribution or population integrity will be identified.
Data on the detection range and efficiency of VR2W-69 kHz acoustic receivers (Innovasea Marine Systems Canada Inc., Bedford, Nova Scotia, Canada; https://www.vemco.com/) were collected to guide the development of telemetry studies of the Clear Lake Hitch (Lavinia exilicauda chi), an imperiled fish species endemic to Clear Lake, Lake County, California. The study took place June 21, 2021 through July 01, 2021. Receivers we deployed at distances of 0m, 25m, 50m, 100m, 200m, and 300m from a sentinel test tag. The test tag was deployed for 20 minutes and emitted signals approximately 6-7 times per minute. Data recorded included the total number of signals emitted by the test tag and the number of those signals that...
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