DYKT? Fishways / échelle à poissons


Fish_ladder

Fishways, most commonly referred to as fish ladders but also known as fish passes, are structures placed on or around man-made barriers (such as dams and weirs) to assist the natural migration of diadromous fishes. Most fishways enable fish to pass around the barrier 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 as to wash fish back downstream or to exhaust them to the point where they cannot continue their journey upriver (…)

I just LOVE the wikipedia :love:

en français:[/U]

échelle à poissons

Une échelle à poissons ou passe à poissons est un dispositif permettant aux poissons de franchir un obstacle créé par l'Homme sur un cours d'eau, généralement un barrage ou un seuil.

Se présentant schématiquement sous la forme d'une sorte d'escalier constitué d'une succession de petits bassins, une échelle à poissons permet aux poissons migrateurs (anguille, alose, saumon…) effectuant leur montaison, ainsi qu'aux poissons cherchant les têtes de bassin pour se reproduire (par exemple les truites) de s'affranchir des obstacles créés par l'Homme et mettant leur survie en danger (…)

J'aime le wikipedia:love:

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5 Comments

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5 responses to “DYKT? Fishways / échelle à poissons

  1. wickedlizard

    that is so neat! thanks for sharing! 😀

  2. pfelelep

    My pleasure, indeed you'll show off with your friends then.

  3. wickedlizard

    ok… 😀

  4. michael_aka_emilien

    I love wiki too!:DThe image you posted is very interesing. I like it :)M.

  5. pfelelep

    unbelievable, eh?I just learn something everyday 😛

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