If you are killing all the weeds in the pond at once, I'd wait 2 to 3 weeks after they die before introducing the forage fish population. That way the weeds have a chance to die, decompose and the O2 level can recover.

The concern is the low O2 levels due to all the organics decomposing, not the herbicide.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).