Oltre 70 salmoni stanno risalendo il Reno verso la Svizzera. È un record, rileva venerdì il WWF in una nota. Ogni anno il numero aumenta grazie alla realizzazione di istallazioni che permettono ai pesci di superare ostacoli come le centrali idroelettriche.
In autunno è stato messo in servizio a Strasburgo un passaggio per pesci. Inoltre, entro il 2020 altre quattro centrali che si trovano in Alsazia (F) e quella di Birsfelden (BL) disporranno di analoghi dispositivi, precisa oggi l'organizzazione ambientalista.
Tutto questo permetterà quindi al salmone dell'Atlantico di risalire il Reno e di raggiungere poi l'Aare, la Limmat e la Reuss. I passaggi realizzati non sono utili solo per i salmoni, ma anche per altri pesci migratori come l'abramide, il barbo e l'anguilla che seguono lo stesso percorso.
Sabato si tiene la giornata mondiale dei pesci migratori e oggi il WWF proietta a Basilea immagini del mondo sottomarino su muri e facciate lungo il Reno.
ats/joe.p.
RG 18.30 del 20.05.2016 Il servizio di Maria Jannuzzi
RSI Mondo 20.05.2016, 20:46
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