Nei fiumi svizzeri sono state identificate oltre 50 specie di pesci. È la conclusione di un'indagine condotta da "Progetto Fiumi" che, per la prima volta, ha inventariato con metodi standardizzati la diversità ittica presente nei corsi d'acqua elvetici. "Progetto Fiumi" costituisce così la prima panoramica di gran parte della diversità ittica nei corsi d’acqua svizzeri.
Gli scienziati dell’Istituto di Ricerca sulle Acque di Eawag, con l’aiuto di professionisti nel settore e volontari, hanno pescato la fauna ittica elvetica in 324 siti fluviali, dalla pianura sino ai 2200 m.s.l.m.
Il risultato? Sono stati catturati più di 20'000 pesci appartenenti a oltre 50 diverse specie; 12'000 campioni di DNA sono stati prelevati e oltre 5'000 campioni di squame sono stati archiviati per future ricerche. Dal più piccolo al più grande: si va dallo spinarello di due centimetri al pesce gatto del Reno di 140 centimetri.
La ricerca ha infine evidenziato che la trota fario, presente nella Svizzera italiana, è minacciata di estinzione.
La pubblicazione è consultabile su admin.ch.
Sagra del Pesce
L'ora della terra 26.03.2023, 09:05
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