How do salmon swim up waterfalls?



  1. 0 Votes

    Good leaps depend on the pool below the falls – the deeper the pool, the better the take-off angle, and the faster the fish can go. Also, water falling from a ledge above hits the water surface below, and continues to plunge deep below the surface. Under pressure from more plummeting water, the water then rushes back up to the surface. The continuing falling water acts as a hydraulic jack, squeezing the water back up to the surface. The salmon are able to use the “hydraulic jump” water to boost their initial leap. The Atlantic salmon is the best leaper of all salmon.

  2. 0 Votes

    Salmon are able to swim upstream and leap up waterfalls primarily due to the power of their tail and its rapid lateral movement. But they also get some help from the waterfall itself; the water rushing down from the falls often forms a deep pool, giving salmon more room for a takeoff jump. Also, after the water plunges down from the falls, it rushes back up to the surface, creating a sort of hydraulic jack to help push jumping salmon faster and higher. Finally, there must be something said for the pure drive of salmon–after swimming up to thousands of miles to spawn in high mountain waters, what’s one little twelve-foot jump?

  3. 0 Votes

    They swim fast and as strong as they can, allowing the water current and their own mad dash to help them up the waterfall. They fling themselves up in a steeply-angled broad leap, and when they are airborne, they move their tails violently, using the momentum to propel them upward. Once they are halfway up the first cascade, they swim to the top, before leaping at the next cascade, and so on…

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