If you have oaks or pines then the soil is likely acid (like North LA). In that case lime will be needed. Same for swamps as most are acid. I would go ahead and put in lime - after you take samples. 2 tons of ag lime per acre would be a good start pending test results.
See pg 24 of this link to the LA Pond Manualhttps://www.lsuagcenter.com/NR/rdonlyres...3FarmPonds2.pdf