Cav, the best route is to gather several soil samples around the pond and surrounding areas, mix then, then take them to your USDA office or other place to be tested. They will tell you how many tons of Ag lime is needed to reach a target pH. I suspect in the pine area you will need, at minimum, 10 tons or more per acre. Adding higher amounts won't hurt and can extend the time between applications. Spread about half in your pond, and the rest in as much of your watershed drainage area as possible. Ag lime does take a little time to work, but will work until acids dissolve it all (8-15 years) at proper application rates. Hydrated Lime is very different, it acts almost instantly, and is very short lived.
I would not suggest using Hydrated lime. You could still stock your fish and add the Ag lime without danger to the fish, since the Ag like changes the pH slowly.
