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Le catture di pesce siluro sul Verbano sono in aumento: è quanto segnalano alcuni pescatori attivi sul lago. Bisognerà però aspettare ancora qualche mese per avere dei dati che confermino questa generale impressione. A dirlo è Danilo Foresti, consulente scientifico all’Ufficio Caccia e pesca.
Il siluro è una specie aliena presente nelle acque della Svizzera italiana da una ventina d’anni. Si tratta di un pesce invasivo, originario dell’Europa orientale, che può raggiungere i due metri di lunghezza. La sua presenza in un ecosistema come quello del Verbano porta a uno scompenso iniziale, che poi si trasforma in un nuovo equilibrio, aggiunge Foresti.
La presenza in un ecosistema di una specie invasiva porta inizialmente a uno scompenso, spiega l’esperto, ma poi a lungo andare a un nuovo equilibrio.
Il siluro oggi non può essere più eliminato: la sua presenza potrà essere controllata solo tramite la pesca ormai.
CSI/mrj
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