The fishing permits of the local fishing association (Associazione Pescatori Basso Sarca) are on sale on this page (see box below), and at the Information Offices of Garda Trentino:
Prices: Daily permit € 18,00. Daly permit for Lake Tenno € 12,00. 3 days promotion, not valid for Lake Tenno, € 40,00. 5 days promotion, not valid for Lake Tenno, € 70,00. Daily permit in October € 20,00.
The fishing season on the river Sarca begins on 09.02.2019 and ends on 30.09.2019. For the small lakes (except Tenno) and "no kill" fishing grounds the season ends on 31.10.2018. Fishing in the rivers and lake Tenno is forbbiden on fridays, except on public holidays. For the full list of fishing grounds and the regulations in English, please refer to the website of the fishing association: Zones, Map, Regulations.