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Usinas hidroelétricas são destruídas para permitir passagem de peixes. | AQUABR
Notícias

Usinas hidroelétricas são destruídas para permitir passagem de peixes.

Barragens são destruídas para permitir passagem de peixes nos EUA, usinas feitas na primeira metade do século 20 não tinham escada de peixes.

  • Por: AQUABR
  • 17/09/2011
  • 1959 visualizações

Duas barragens que vinham atrapalhando o fluxo de peixes no Rio Elwha, no estado de Washington. O rio fica dentro do Parque Nacional Olympic e conta com uma variedade de espécies de salmão do Oceano Pacífico.


As represas foram importantes para o desenvolvimento da Península Olympic, mas estão obsoletas, Na época em que foram construídas, ainda não se usava  passagem de peixes, um tipo de escada que permite que os animais subam o rio.

Orçada em cerca de US$ 325 milhões e com previsão de durar três anos, a remoção das barragens foi considerada a maior da história dos EUA. O projeto é um desejo de ambientalistas desde os anos 1970. A administração do parque estima que, antes da existência das barragens, cerca de 400 mil salmões subiam o rio a cada ano.

Os salmões são importantes para todo o ecossistema da região. Eles servem de alimentos para animais maiores, como ursos, e beneficiam também árvores, já que os peixes mortos fertilizam o solo.

Além disso, tribos nativas que habitam o parque nacional veem o salmão como um símbolo de sua cultura. O alto do rio, com seus salmões, é uma região sagrada para eles.

 

hidroelétricas de Elwha Elwha Truta

 

Fonte: G1/globo.com
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