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fish ladder

   Also found in: Dictionary/thesaurus, Wikipedia 0.03 sec.
fish ladder [′fish ‚lad·ər]
(civil engineering)
Contrivance that carries water around a dam through a series of stepped baffles or boxes and thus facilitates the migration of fish. Also known as fishway.


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The area had been blocked for the past 50 years to steelhead migration, but was reopened in December 2004 with the help of a massive concrete fish ladder that allows the fish to swim higher up the river west of Ojai.
As well, a fish ladder was constructed, similar in nature to an underwater flight of stairs, connecting the lake to the downstream creek.
Despite special fish ladders and other bypass devices, dams alter the habitat, impede fish migrations, kill many young, seaward-migrating fish in hydroelectric turbines, and expose species to predation that they wouldn't typically encounter in a free-flowing river.
 
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