Wayne nailed, they fly 'em in. As far as fin clipping goes they do indeed clip the adipose and even partial clips of the dorsal fin (some do get missed in the process). Changing the fin clip each year allows them to identify when it was stocked, thus allowing growth and health info to be gathered.
Specks can under ideal conditions spawn in upwelling springs as long as they can expose clean gravel that doesn't silt over before the eggs hatch. A friend has a cottage on a spring lake where I've wittnessed this many times. The trout will expose clean gravel on the lake bed where springs well up. Mind you these are wild specks and this trait is inherit, stockers may not do well in this type of situation.
As far as splake or brookie? Even to the trained eye it can be difficult. Check these links.
http://www.couplesresort.ca/Attractions/Ar...ish/Splake.html
http://www.mnr.gov.on.ca/en/Business/LetsF...age/200080.html
The thing to do would be to contact the local MNR and request stocking information on the lake, they will give it to you.
I will say it again though, they are all magnificent fish.