Do not kill an extensive coverage of algae all at once or all that decay of dead algae will consume enough DO (oxygen) that loss of oxygen will kill fish - maybe all fish esp if you get a few cloudy days. Larger fish will die first. Presence of blue dye will reduce the ability of the pond to naturally produce dissolved oxygen via phytoplakton which increases the chance of a DO shortage if lots of FA is decaying. Lots of decaying algae will release lots of bound nutrients to 'feed' more plant growth of some sort. Consider using a seine to skim off large amounts of algae before treating. Removing algae reduces the absorbed nutrients.
In rereading this whole topic and since your 3/4 pond is an ave depthof 4-5ft IMO your long term plans should budget for renovating and rebuilding this pond to have deeper ave depths and minimize watershed nutrient accumulation. As you are learning shallow water usually results in production of more plants of some kind.
Last edited by Bill Cody; 10/10/22 09:34 AM.
