How does a summer fish kill happen? Wow what a year, spring seemed to last forever and the rain seemed never ending. Then all the sudden the faucet was turned off and hasn’t turned back on again. At the same time the rain stopped it turned into summer temps’ and has been here since. Now we want rain for the gardens, crunchy brown grass, crops and of course the ponds are slowly getting smaller.
With the hot temperatures and lack of rain the water has warmed up as well, no need to “get use to it” just walk right in. Good for us but not the fish. You see they can stand some pretty warm temps’ and they will just slow down a little. The biggest thing to be concerned with is how much dissolved oxygen is in the water and to what depth does the oxygen reach?
Why does this matter? Fish need oxygen just like we do. But a pond without aeration or a poor aeration system does not 
get enough oxygen to the bottom of the pond where it is needed. Down at the bottom there is these guys called anaerobic bacteria. They live in the muck slowly eating away at it, they create some bad stuff. The “stuff” is toxic gasses to fish, ammonia, carbon dioxide, and hydrogen sulfide. These gasses accumulate at the bottom and build towards the surface, see what’s happening, the fish are being pushed to the surface for more oxygen.
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Please guide me how to clean the Pond of surface plants, floating grass, submerged plants and green algae floating across the surface of the water. In controlled growth none of these is a problem . They have a right to survive and propagate. But in excess it creates problem in breeding of fungus, worms like mosquitoes, and bacterial growth giving off foul smell.