Yukon: when and where to go?

[Arnak]

Hi,
This year we would like to fly to Whitehorse and look for some good fly fishing. Anytime between May and September is good for us. Our plan is to fly to Whitehorse, rent a car and fish for a few days. Right now I'm looking for options: peak season for each species, where to go within a few hours of Whitehoses, etc.

Any info to help us start planning will be much appreciated.

Thanks