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La trota fario è quasi completamente assente dal medio corso del fiume Maggia e completamente scomparsa tra Ponte Brolla e la foce. Lo dice uno studio condotto tra il 2015 e il 2016 dal Dipartimento del territorio e da un’azienda specializzata di Olten. Le conclusioni, realizzate dopo due anni di misurazioni e prelievi, sono state pubblicate dal mensile “Caccia e Pesca” e confermano in questo modo quanto si temeva da tempo.
Sono diverse le cause che hanno portato a questo impoverimento ittico, tra queste le temperature sempre più alte delle acque (nell’agosto del 2015 per esempio 27 gradi costanti) e la scarsa presenza di esemplari maturi, quindi riproduttori.
CSI/AlesS
02:17
CSI 18.00 del 20.8.2017 Il servizio di Luigi Frasa
RSI Info 20.08.2017, 19:45
Contenuto audio
Laghi privati - Povero fiume
Falò 22.09.2016, 21:10
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