Downstream migratory behavior of hatchery-reared, radio-tagged Atlantic salmon (Salmo
By Agnes V. Spicer, John R. Moring, Joan G. Trial
Fisheries Research, Volume 23, Issues 3-4, June 1995, Pages 255-266, ISSN 0165-7836, DOI: 10.1016/0165-7836(94)00352-W.
Migratory patterns and timing of smolt movements of Atlantic salmon (Salmo salar) were assessed by placing radio tags on salmon in 1990 and 1991 and releasing fish at Howland, Maine, about 91 km upstream from the mouth of the Penobscot River. Fish movements were tracked by vehicles on streamside roads and by airplanes. Fish released in April moved quickly into the main channel of the river, although 47% of the signals ceased or became stationary within 10 km of the release site, owing to predation, battery failure, or cessation of migratory behavior. Only 3% of smolts were tracked over 40 km downstream. Of those fish actively migrating downstream, the passage rate averaged 3.7 km day-1, ranging from 0.5 to 15.7 km day-1.
Keywords: Salmo salar, Migration; Tagging