These might actually work for fly fishing, depending upon how you use them. They would probably work best if you spend most of your time fishing from shore, only occasionally wading into the water. The sole looks fairly grippy, but all bets are off on slippery river rocks. One concern would be that if you are going to be spending a lot of time in the water, gravel will tend to accumulate in the shoes (and there don't appear to be good drains to help prevent this), then you would need to untie them and take them off to get the gravel out.

One problem in finding good shoes for flyfishing (including the ones made specifically for this purpose) is that the ones that seem to work best in the water look like, well, water shoes (which limits their use when not fishing). The best shoe that I have found (based upon comfort and traction) is the North Face Padda http://www.backcountry.com/outdoorgear/The-North-Face-Padda-Amphibious-Shoe-Womens/TNF2843M.html

Other water shoes can be found here:
http://www.backcountry.com/store/group/170/Womens-Water-Shoes.html

Write your answer here...It runs a little small for me, normally I'm a size 6, i wear a 7 in chaco "Zongs".

Shirley,Prior to your post and looking into it, I did not know anything about aqua fitness. I noticed most people don't wear shoes when doing activities in the pool. At the same time I found numerous sites selling shoes for aqua fitness activities. Does your class or instruct recommend wearing shoes in the pool? Most shoes you wear in the water are going to feel clunky and restrictive. Have you looked into water weights for your ankles to get a better workout? Anyways, these shoes will work great as a shoe you wear to the pool and in the shower room. If you wear these in the pool the chlorine will wear out the materials prematurely. Also, look at http://www.backcountry.com/store/group/170/Womens-Water-Shoes.html which has water specific shoes and sandals. Everything on the water shoe page will be a lot more open. Good luck with water aerobics! Now I know what water aerobics consist of.Mahalo, Sumo