I have see lots of people looking here for fishing at Mt. Whitney. The amount of fishing is very limited. The trailhead has a small pond that many kids fish in. The first lake on the main Mt. Whitney trail had quite a few fish in it when I looked at it. I also couldn’t find much fish between Lone Pine and the Mt. Whitney portal, but there is definitely some good fishing in the area. This weekend I hit some of the streams between Tioga Pass and Lee Vining, was skunked, but they are great looking spots. Sorry I can’t be of more help for the Whitney area.
-David