I'm pretty sure it kills everything it comes in contact with. As stated previously, a jar sample of water off my dock didnt have anything phytoplankton or zooplankton in it at all. Really glad I'm feeding both pellets and Black Soldier Flies, or the fish would be starving.

.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!!