Sulphur makes me think of volcanic activity, which (in my experience) makes for acidic water, so the first thing I'd do is test the pH. We use white coral sand in our ponds to neutralize the constant acidification.

After that, I'd try cheap mosquito fish; if they survive, move up to goldfish and eventually koi.

Thanks steiconi I have little test kits that I use for my current ponds and aquariums, do you think I would have to do a large water analysis and who would do that kind of thing? Central Fl is known for this type of stinky water, nice to know there is a counter balance with the coral sand and that sounds pretty too.

I would expect that all the water in your pond would have similar pH, so a small test should be enough.

I have alot of experience with this here is a link that might help you. Pay attention to the aeration part. There is a build up of methane gas and the pond needs to be aerated.

Here is a link that might be useful: Gabelmans Gardens blog