[Peter Davidson]

We were wending our way home at about 5500ft along the XC ski trail near Saas Fee when my good lady saw what looked like a fish ladder and asked me if there were salmon in the river. I doubted it but I had seen some trout here last year in March. I then moved on pondering "What is the highest altitude a salmon has been caught?"
I'm sure there'll be a cut and dried answer, no argument or deviation amongst the knowledgable 

[Mike Barrio]

Nice photo Peter

[Hamish Young]

"What is the highest altitude a salmon has been caught?"

Well I've caught one which took a dapping fly that was 4 feet up in the air.... but I don't think that's quite what Peter is asking 
I genuinely don't know, it's an interesting question and I do have a couple of ideas for Atlantic Salmon but research required.

H

[Derek Roxborough]

I would suppose they would swim as high as there was access,   Derek Roxborough

[Hamish Young]

I would suppose they would swim as high as there was access,   Derek Roxborough

Indeed, the question is.... where exactly is that

[Derek Roxborough]

Indeed, the question is.... where exactly is that

  as far as they can get?     perhaps some of the Norwegian rivers have the answer?    Derek Roxborough

[Peter Davidson]

I wondered about countries too. Currently I'm in Switzerland which is a long way from the sea compared to Norway which hs a very high ridge running down it's spine - as does much of Scotland. So my theory now tends towards specific geographics - the further from the the sea that a river can originate may have bearing on the average fall/km of that water. The lessor the rate of climb and the further away from the sea could indicate a longer but easier route for returning hens?
This is all pretty far away of the things I should be concentrating on at present. Body position, leg flex, carving turns, skating turns and falling over turns!

[Derek Roxborough]

  Hope yer not on the Piste, Peter? Derek Roxborough