fish ladder

a series of ascending pools constructed to enable salmon or other fish to swim upstream around or over a dam.

1860–65, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fish ladder
a row of ascending pools or weirs connected by short falls to allow fish to pass barrages or dams

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The boat whips to the right, and the two gunmen in the bow take aim at a
  culprit near the south fish ladder entrance.
The hatchery has a fish ladder that the salmon go through to get to their final
Salmon and steelhead jump over twenty steps to the top of the fish ladder.
The fish ladder design at this ladder is called vertical slot.
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