Secret spot?

We are heading to Kuusamo next week. I have made inquiries at Finnish fly fishing forums and received replies and even private messages of few small streams over there. These are possibilities for excellent grayling fishing. Some say that there are 50 cm (20”) graylings there, while others say that majority of the fish are around more typical 30 cm (12").

I'll be happy if I get few small ones, but the possibility of big grayling is exciting.