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Redband Trends (Draft)

Middle Snake Geographic Unit

Historical Stream Miles Occupied: 8,379

For the Middle Snake Geographic Unit, researchers have estimated that 8,379 miles of streams are occupied by redband trout in the geographic unit.

Researchers have found that redband trout are widespread and abundant in the Idaho portion of the geographic unit with more than 3 million fish existing throughout the Idaho section (excludes Jarbidge River drainage and Duck Valley Reservation). Unfortunately, trends across time do not exist for the populations.

The Malheur Lakes section of the geographic unit includes ten populations in the closed interior basin of Harney and Malheur lakes. Historically, all of the streams were connected; however, the populations are now isolated due to man-made barriers. Surveys (2007-2011) in the Malheur Lakes section of the geographic unit indicate that the abundance of age-1+ redband trout declined by 27% between 2007 and 2010; however, an increase was observed in 2011. Managers suggest redband trout abundance is likely correlated with annual stream flows.

Limiting factors throughout the geographic unit include water quality, habitat degradation, water quantity (flows), connectivity, and non-native fish species.

Adapted From:
Meyer, K.A., D.J. Schill, E.R.J.M. Mamer, C.C. Kozfkay, and M.R. Campbell. 2014. Status of Redband Trout in the Upper Snake River Basin of Idaho. North American Journal of Fisheries Management 34:507-523.

ODFW. 2005. 2005 Oregon Native Fish Status Report. Oregon Department of Fish and Wildlife. Salem, OR.

Malheur Watershed Council and Burns Paiute Tribe. 2004. Malheur River Subbasin Plan. Prepared for the Northwest Power and Conservation Council. Portland, OR

Muhlfeld, C.C., S.E. Albeke, S.L. Gunckel, B.J. Writer, B.B. Shepard, B.E. May. 2015. Status and Conservation of Interior Redband Trout in the Western United States, North American Journal of Fisheries Management 35:1, 31-53.