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Salmon ladder ved Tengsfossen

A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial barriers (such as dams and locks) to facilitate diadromous fishes' natural migration.[1] Most fishways enable fish to pass around the barriers by swimming and leaping up a series of relatively low steps (hence the term ladder) into the waters on the other side. The velocity of water falling over the steps has to be great enough 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 inability to continue their journey upriver.

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Photo details

  • Uploaded on November 28, 2012
  • © All Rights Reserved
    by Amelia Heath
    • Camera: NIKON CORPORATION NIKON D5100
    • Taken on 2012/11/23 14:22:09
    • Exposure: 0.067s (1/15)
    • Focal Length: 34.00mm
    • F/Stop: f/8.000
    • ISO Speed: ISO450
    • Exposure Bias: 0.00 EV
    • No flash