I've never fertilized my pond but I think you want something with high phosphorus (second number on the bag).

I do feed. Started with Gamefish Chow but moved to Aquamax 400. Higher protein. I also supplement that with black Soldier fly larva.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!