Movement and homing of cutthroat trout (Salmo clarki) in Clear and Bridge Creeks, Yellowstone National Park
Journal or Book Title
Transactions of the American Fisheries Society
Mature cutthroat trout (Salmo clarki) exhibited in-season homing to tributaries andredds in Clear and Bridge Creeks, Yellowstone National Park, in 1967, 1968 and 1969. Of 532fish displaced from a small stream tributary to Clear Creek, 135 (26.4%) horned, 23 (4.5%)strayed and 281 (52.8%) were unaccounted for. Significantly fewer anosmic and blind fish hornedthan controls. More blind fish strayed than other groups. Of 190 fish displaced from the North andSouth Forks of Bridge Creek in 1968 and 1969, 60 (31.6%) horned, 7 (3.6%) strayed and 114(60.0%) were unaccounted for. Fewer anosmic and blind fish horned than control and nonanesthetised.Mean homing times were shortest for non-anesthetised and progressively greaterfor control, anosmic and blind fish in both Clear and Bridge Creeks. Mean homing time for allgroups from Clear Creek in 1969 was double that of 1968. Twenty-nine (40.9%) of 71 fishdisplaced from redds in Clear Creek in 1969 horned to the same redd from which they weretaken. Eighteen (25.4%) returned to within 2-3 m of the home redd. Nine (12.7%) strayed and 14(19.7%) were unaccounted for. Homing to redds did not appear to be affected by the distancedisplaced.