Fish Ladder
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<fishfyi-glossary slug="fish-ladder"></fishfyi-glossary>定義
A structure built alongside dams and barriers that creates a series of ascending pools, allowing migratory fish like salmon to bypass the obstruction and reach spawning grounds.
詳細説明
Fish ladders (fishways) come in multiple designs: pool-and-weir ladders create a series of pools connected by cascades; vertical slot fishways use a narrow vertical slot allowing fish to ascend at any depth; and denil fishways use a series of baffles to create a slow-water corridor within a steeper channel. Effectiveness is highly variable: traditional pool-and-weir ladders designed for salmon may be completely impassable for weaker swimmers like shad or lamprey. Fish elevators (trapping fish below the dam and lifting them hydraulically) achieve near-100% passage rates but require intensive operation. Dam removal — increasingly pursued on old, small, economically unviable dams — restores connectivity more completely than any passage structure.