Fishing rules In Finland are very simple: fishing on a fishing rod or on a bottom (without use of feeders) does not require any licenses, as well as fishing in winter. A spinning license is required from the age of 18-65, whether you are fishing on a spinner or a trolling. The license is divided into federal and provincial and can be easily purchased at R Kioski in Imatra or online.
https://verkkokauppa.eraluvat.fi/fi/
You can choose the license for the time you need – day, week, month or year: the license for 1 tackle (1 rod) costs 6 euros per day, for 2 weeks 15 euros, and for a year 50 euros. You can rarely be asked to show this license to the locals living on the shores of the lakes, license absence is a risk of spoiling your holiday and mood. Finns are very proud of the purity of their nature and believe that compliance with the law helps to keep nature virgin as you see it.
Therefore, they can approach you by boat and ask for the license, if you have it, they will calmly thank you and come back home, the lack of a license may force them to call the police and you will be fined and it will ruin your nerves. I kindly ask to avoid these unnecessary negative emotions and don’t risk it.