Fish ladder
Fish ladder
Structure to allow fish to migrate upriver around barriers.
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Readers' pathsAug 2026 – Oct 2026
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Fish migration
Movement of fishes from one part of a water body to another on a regular basis.
16%
Elver pass
Waterway modification for eels.
10%
Bonneville Dam
Dam on the Columbia River, United States.
9.4%
Weir
Artificial river barrier.
8.7%
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Structure to channel water past an obstacle.
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Annual migration of salmon.
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Pitlochry fish ladder
Structure in Perth and Kinross, Scotland.
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Fish screen
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John Day Dam
Dam in the northwestern United States.
2.8%
Stepped spillway
Structure for energy dissipated release of flows from a dam or levee.
2.5%
Readers come from
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Dam
Barrier that stops or slows the flow of water.
14%
Weir
Artificial river barrier.
6.2%
Eel life history
Eel life cycle.
5%
Pneumatic tube
Compressed air or vacuum transport system.
4.4%
Farakka Barrage
Dam in West Bengal, India.
4.4%
Culvert
Structure to channel water past an obstacle.
3.8%
Ballard Locks
United States historic place.
2.2%
Fishing weir
Obstruction placed in tidal waters to trap fish.
1.8%
Wildlife crossing
Structures enabling wildlife to safely cross human-made barriers.
1.6%
Polavaram Project
Dam in Eluru district, Andhra Pradesh, India.
1.6%