Fish ladder
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A fish ladder, also known as a fishway, fish pass, fish steps or fish cannon, is a waterway structure on or around artificial and natural barriers that provides aquatic animals a "detour" to facilitat
Pool-and-weir fish ladder at Bonneville Dam on the Columbia River
Salmon climbing a ladder on Issaquah Creek, Washington
Cameras or other types of devices can be used to count fish as they pass through the ladder.
Denil Fishway on Salmon Creek, Montana
Fish migration
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Fish migration is mass relocation by fish from one area or body of water to another. Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over di
Fish ladder
…natural barriers (such as dams, locks and waterfalls) that provides aquatic animals (particularly fish) a "detour" to facilitate natural movements and migrations of diadromous and potamodromous species. Fishways enable fish to pass around the water level difference around barriers by swimming and/or leaping up…
Many species of salmon are anadromous and can migrate long distances up rivers to spawn
Life cycle of anadromous fish. From a U.S. Government pamphlet. (Click image to enlarge.)
Auklet flock Shumagins 1986
Antennarius striatus