Farm pond?

We have a small water retaining pond on the farm that is roughly 25x50 maybe little bigger when i was a kid we had sunnies an some bass in the pond but over the years the pond ran out of fish and is full of snapping turtles. I would like to get it back to holding fish for my niece to have somewhere to fish since most lakes here are over fished by the adults. I know i would need to get the snappers out an reduce the amount of them in it but what else can i do? the pond has a bunch of duck weed on the surface i can scoop off to reduce the amount of it but i know getting rid of duck weed is hard. the pind is only a  few feet deep in the middle nothing crazy but it has some muck on the bottom which i dont know if that will matter for putting sunnies in it maybe some bass. It only gets fresh water when it rains so im not sure how much oxygen is in the water but it held fish before. Just trying to get it back to a fish holding state for little ones to fish at.

Maybe putting in a lot branches or medium sized rocks if available could help create cover and habitat for the fish to hide from the turtles.

Aquatic plants could also help increase the oxygen in the water and also provide additional hiding places from the fish.

I had a similar thing happen to a lake we used to visit. There used to be tons of bluegill, sunfish, perch, and bass. Then all of a sudden there was a huge spike in the turtle population, and the number of fish dropped dramatically. Only catfish seem to be unaffected and still thriving. I'm pretty sure someone had previously been removing the turtles.

Best of luck! I have a lot of good memories fishing when I was young, so hoping you and the little ones can make some good memories together fishing soon!