I drained and killed of the fish in my farm pond with Hydrated lime this spring.

Had a friends dog swim in the pond to cool down after a run. When we were checking the dog for ticks we found about a 1/3" long leech on the dogs belly.

Was shocked to see a leech.

I stocked HBG and FHM about 2 months ago. Do they eat leechs or is there some other fish that I should look at to control them?