I wonder if the photo was 'greened up' a bit in photoshop????
Quite probably, I'd also suggest that it's a load of fictitious rubbish. What are the chances of two lads from Manchester fishing for carp a mountain lake in Switzerland? What chances are there that there are even carp in such a lake?
If the picture hasn't been "shopped" to within an inch of its life, it'll just be algae. Plenty of UK stillwaters look like someone has been throwing tins of green paint around at certain times of the year.
This might have been better to poke fun at Korda with.
[ame=http://www.youtube.com/watch?v=guLGtpS8v24]St Patrick's day parade: Chicago green river 2012 - YouTube[/ame]