Your limit is "in possesion". Once eaten, who can prove it is in your possesion? Catch your limit. Eat them. Go catch more. The bigger issue is that 10 days of nothing but trout may be more than most people want to eat. But yes, the trail bar-trout diet can work if you can catch lots of fish. Better yet, catch a few really big ones. I have never been able to catch enough fish in the Sierra to live off them, but I have done this in the Wind Rivers on 4-day 40-mile survival treks.