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e-fish
FISHBIO, in collaboration with the Army Corps of Engineers and other Federal and State agencies, is currently monitoring habitat use of various focal fish species (native anadromous salmonids and their native and introduced predators) at recent (post-2006) levee repairs on the Sacramento River. These repair sites incorporate various design types such as setback levees and wetland trenches, intended to enhance the habitat value of these sites to native fishes. Abundance surveys, timed to coincide with the peak outmigration of Chinook and steelhead, are conducted by boat electrofishing and provide crucial feedback on the habitat value of the general levee repair design types to target species. In addition, a host of associated microhabitat features, such as instream woody material, vegetation coverage, depth and current velocity are collected and evaluated to determine habitat preference of juvenile salmonids as well as predation risk (based on predator abundance). Other aspects of our monitoring work include the use of radio telemetry to evaluate habitat use of various species, photo point monitoring and side scan sonar imaging of to track repair site maturation above and below the waterline.
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juvenile-salmon-surgey
