But how much such fence could cost? And what about use of electricity?
This year electricity rates raised a lot.... frown
By the way, 8000 volts - are you kidding?

Uh, almost forgot to tell you about beavers. Latvia is overpopulated by these oversized rats... they don't eat fish but they ruin ponds by building dams, dragging trees into pond and so on... some of them are caught by traps but they multiply faster than can be killed.
Now they aren't under any protection (except time when they have young ones) but it doesn't help.