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: To improve modeling of juvenile salmon behavior and movement in the Sacramento River, smaller winter-run Chinook and larger late-fall-run Chinook salmon were tagged and released into a 2D telemetry array during the winter of 2015. Detection positions were filtered and discretized to create two-dimensional tracks and measure movement characteristics, evaluate space use, and assess whether these runs displayed distinct behavioral differences. Speed over ground and turning angle were not significantly different between release times, fish size, or run. Only the initial movement rate between release and array locations was significantly different between the runs. Both runs displayed a non-uniform distribution within the channel and tended to use space along the outer bend more frequently than the inner bend. Winter-run Chi-nook salmon tracks were slightly farther towards the outer bend than late-fall-run Chinook. A similar result was not ob-served in smaller and larger late-fall-run Chinook, which suggested that differential space use may be influenced more by run identity than variation in size between runs. Although small differences between runs were measured, it is reasonable to aggregate these results for a singular juvenile salmon behavior model, rather than developing independent juvenile behavior models based on adult run-timing.

Two-dimensional movement patterns of juvenile winter-run and late-fall-run Chinook salmon at the Fremont Weir, Sacramento River, CA