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L'Ufficio caccia e pesca fino a giovedì si occupa del censimento della popolazione ittica del fiume Brenno. Un gruppo di tecnici, muniti di stivali e guanti di gomma, misura e quantifica la fauna fluviale nella zona di Pian Segno, in Val di Blenio, usando la tecnica dell’elettropesca: due elettrodi vengono posti in due punti del corso (a 150-200 metri di distanza), attraendo i pesci con il polo negativo.
La misurazione dei pesci a Pian Segno
"Qui la conduttività dell’acqua è una delle maggiori in Ticino, bisogna stare attenti" avverte Bruno Polli, responsabile del progetto, al microfono di Francesca Calcagno delle Cronache della Svizzera italiana. "Una volta catturato, addormentiamo il pesce mediante un prodotto, per poi fare le misurazioni".
Si registrano lunghezza, età e peso. Una volta raccolti i dati, le trote si risvegliano e vengono rilasciate in acqua. "Anche se spostate di diversi metri, riescono a ritrovare la tana". I dati raccolti saranno discussi anche con la federazione Ticinese per l’acquicoltura e la pesca. In base alle conclusioni si deciderà il piano di gestione della fauna ittica.
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