I wouldn't count on fish as a sure thing, based on the number of times I've NOT caught fish, even in my "honey holes". I consider fish and game as an opportunistic meal, with the odds of your success being propotrional to your skill level and experience.
But suppose I got hoplessly lost and knew I might be in the field a while, before I could reasonably excpect to be found and rescued. I would save my freeze dried and munchies, and begin setting up snares for game, and fish traps, and making a fish spear, if there was enough water near by to hold a population of fish. I'd use my freeze dried and other items, when unsuccessful at snaring rabbits or what ever, in that scenario.

If I fish now, it's just for the fun of it, but I wouldn't mind keeping a catfish, crappie or trout for dinner.

J. laugh