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Most fishways facilitate fish to pass around the barriers by swimming and leaping up a series of comparatively low steps (hence the term ladder) into the waters on the other side.
The velocity of water falling above the steps has to be great adequate to attract the fish to the ladder, but it cannot be so great that it washes fish back downstream or exhausts them to the point of incapability to continue their journey upriver.
FISH LADDER
A
fish ladder, also known as a fishway, fish pass or fish steps, is a structure
on or approximately artificial and natural barriers (such as dams, locks and
waterfalls) to aid diadromous fishes' natural migration.
Most fishways facilitate fish to pass around the barriers by swimming and leaping up a series of comparatively low steps (hence the term ladder) into the waters on the other side.
The velocity of water falling above the steps has to be great adequate to attract the fish to the ladder, but it cannot be so great that it washes fish back downstream or exhausts them to the point of incapability to continue their journey upriver.
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