I'm with Yolk Sac. 99 percent of all fish kills are due to low D.O. However many times there are other factors that join together that cause a FUBAR. Sounds like you did such a good on the algae the decomposing algae is consuming oxygen, and/or your now 24/7 mixing of the water column is bringing up anoxic water. I don't know enough about the copper to know if you exceeded the lethal dose.

That said I'm not sure if there would be that much anoxic water on it's own this early in the year.

Can you get some kind of surface aeration going even if it's some kind if pump that pumps and splashes water onto the surface?


Last edited by Cecil Baird1; 04/26/14 01:01 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.