Abstract Two techniques for locating and sampling instream brown trout microhabitat under complete ice cover conditions were devised, conducted and evaluated. Results indicate that radio telemetry by means of implanted transmitters is a superior technique over implantation of radioisotope capsules for tracking under-ice movements and locating microhabitat locations. The major drawback with transmitters was battery failure. Winter microhabitat preferences of brown trout were tentatively defined for resting and cover in terms of water depth, water velocity and substrate type.
Instream flow, brown trout, microhabitat, radio telemetry, radioisotope, winter habitat requirements, fish tracking, ice
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