One of the greatest misnomers in trout fishing is the use of the term "German Brown." Unless you're fishing in Germany, the chances of the fish having the genetics of a German Brown are small. Most brown trout in the USA are mutts with a mixture of genetics from German, Scottish, English and Irish fish. Lewis Lake in Yellowstone has a fairly pure strain of Loch Leven Browns from Scotland and, if I recall correctly, they lack any red spotting. Rainbow trout have a similar hodgepodge of genetics in the USA.
Here's an interesting article about Brown Trout in the USA- http://thefrogwater.com/2013/06/01/brown-trout-subspecies-in-the-u-s/
Here's an interesting article about Brown Trout in the USA- http://thefrogwater.com/2013/06/01/brown-trout-subspecies-in-the-u-s/
