The lake is open for ice fishing.
From Jan 4 the ice layer would be thick enough for ice fishing. The cable car operates from 9 am until 5 pm. Please notice that the toboggan run to Kandersteg will be closed due to risk of rock slides. The will be only return tickets sold on the cable car. The region will be closed after 5 pm.
Get you ticket online and skip the line: ticket.oeschinensee.ch
Fishing licences sold in the restaurants around the lake. Get more info under https://www.oeschinensee.ch/en/winter/icefishing/.