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Autor:
Mélanie Dionne, Julian J. Dodson
Publikováno v:
Canadian Journal of Zoology. 80:2006-2013
Some laboratory studies suggest that the presence of predators influences the short-term behaviour of juvenile Atlantic salmon. However, few studies have been conducted in the natural environment to confirm these observations and to document how biol
Autor:
Sayre Hodgson, Thomas P. Quinn
Publikováno v:
Canadian Journal of Zoology. 80:542-555
Anadromous fishes migrate to sea, apparently to take advantage of growing conditions, and return to fresh water to spawn. Despite favorable growing conditions at sea in summer, some populations leave the ocean in spring, many months prior to spawning
Autor:
Thomas E. Reimchen
Publikováno v:
Canadian Journal of Zoology. 78:448-457
I examine here quantity and characteristics of chum salmon (Oncorhynchus keta) captured by black bears (Ursus americanus) during autumn spawning migration in an old-growth watershed on Moresby Island (Haida Gwaii), western Canada. Spawning-salmon num
Publikováno v:
Canadian Journal of Zoology. 78:1026-1031
We evaluated the effects of handling and stocking density (3 vs. 6 fish/150 L) on the growth-rate rhythms of brook trout, Salvelinus fontinalis. The length of nonhandled fish was estimated with a stereo-video technique and the length and mass of hand
Publikováno v:
Canadian Journal of Zoology. 77:1984-1990
We studied the relative vulnerability of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri) versus rainbow trout (Oncorhynchus mykiss) stocked as fingerlings in the North Platte River, Wyoming, to Double-crested Cormorant (Phalacrocorax aurit
Autor:
Ole Kristian Berg, Andrew P. Hendry
Publikováno v:
Canadian Journal of Zoology. 77:1663-1675
Reproductive development and energy stores were characterized for sockeye salmon (Oncorhynchus nerka) maturing in the wild (Pick Creek, Bristol Bay, Alaska). Between freshwater entry and the start of spawning, ovaries increased in mass by 87.1% and s
Autor:
Bengt Finstad, Pål Arne Bjørn
Publikováno v:
Canadian Journal of Zoology. 76:970-977
The developmental rate, distribution on the host, and pathogenicity (skin damage) of salmon lice (Lepeophtheirus salmonis) were tested on artificially infected sea trout (Salmo trutta) post smolts. Male lice developed faster than females, taking appr
Publikováno v:
Canadian Journal of Zoology. 76:783-790
Habitat use by juvenile bull trout (Salvelinus confluentus) and cutthroat trout (Oncorhynchus clarki) in Trestle Creek, Idaho, changed seasonally and dielly. Both cutthroat and bull trout selected pools over riffles in both summer and winter. Both sp
Autor:
Paul W. Webb, Hongbao Zhang
Publikováno v:
Canadian Journal of Zoology. 72:423-426
We measured reaction distance, escape velocity, and the apparent looming threshold (ALT) of heat-shocked goldfish (Carassius auratus) attacked by trout (Oncorhynchus mykiss). We tested fish at the acclimation temperature of 15 °C after heat-shocking
Publikováno v:
Canadian Journal of Zoology. 72:397-405
The evolution of nonanadromous forms of salmonids has been linked to adaptive similarities between migration to the sea and migration to lakes, and to inhibition of smoltification by rapid development rates and early maturation. We examined the seaso