Dutch fish ladder for sticklebacks

This video from Finland says about itself:

Three-spined stickleback and fry (Gasterosteus aculeatus)

July 19, 2010

The male stickleback guards something. I think there was a nest somewhere. Though he may protect his fry. Video was written at the Gulf of Finland in July.

Translated from Dutch wildlife ranger Erik van der Spek; his blog post on fish ladders. In the original, there is not just this photo, but a slide show:

Fish ladders for sticklebacks

Posted on February 12, 2013

For salmon and trout they existed already, fish ladders to pass dams. Threespine sticklebacks need ladders with much smaller steps. Almost 20 years ago, Forestry Texel thought about this. Through these fishways threespine sticklebacks can swim from the Wadden Sea into the Moksloot to lay their eggs in the fresh water of the Dunes of Texel. A marine threespine stickleback is twice as long and five times as heavy as a stickleback which has always lived in fresh water. Large fish lay more eggs, and are also better food for birds like spoonbills.

See also here.

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