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A grizzly bear ambushing a jumping salmon during an annual salmon run. A salmon run is an annual fish migration event where many salmonid species, which are typically hatched in fresh water and live most of their adult life downstream in the ocean, swim back against the stream to the upper reaches of rivers to spawn on the gravel beds of small creeks.
Migration of adult Atlantic salmon may be limited by beaver dams during periods of low stream flows, but the presence of juvenile salmon upstream of the dams suggests they are penetrated by parr. [29] Downstream migration of Atlantic salmon smolts was similarly unaffected by beaver dams, even in periods of low flows. [29]
Spawning sockeye salmon in Becharof Creek, Becharof Wilderness, Alaska. Salmon population levels are of concern in the Atlantic and in some parts of the Pacific. Salmon are typically anadromous - they rear and grow in freshwater, migrate to the ocean to reach sexual maturity, and then return to freshwater to spawn.
Salmon swimming upstream in a river in Alaska. The survival of wild salmon relies heavily on them having suitable habitat for spawning and rearing of their young. [1] This habitat is the main concern for conservationists. Salmon habitat can be degraded by many different factors including land development, timber harvest, or resource extraction. [2]
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Ocean migration of Atlantic salmon from Connecticut River [4] As with various other aspects of fish life, zoologists have developed empirical classifications for fish migrations. [5] The first two following terms have been in long-standing wide usage, while others are of more recent coinage.
Officials counted more than 1,500 of the salmon in the Penobscot River, which is home to the country's largest run of Atlantic salmon, Maine state data show. That is the most since 2011 when ...
Salmon (/ ˈ s æ m ən /; pl.: salmon) is the common name for several commercially important species of euryhaline ray-finned fish from the genera Salmo and Oncorhynchus of the family Salmonidae, native to tributaries of the North Atlantic (Salmo) and North Pacific (Oncorhynchus) basins.