I was fishing today at my usual pond, its only about 70 acres. Anyway the city owns it and they use it for drinking water. Two guys came out today and were in a boat going around the edge of the lake dumping bags of Chemicals? in the water, it made the water turn an aqua blue looking color. About an hour after they left I noticed Shad floating dead on top of the water and also saw a huge Carp floating near the bank. I left soon after that, I wonder what the heck they would put in the lake that would kill Fish? I just hope the bass all survive.

Maybe flouride?? Kills fish but fights cavities...

I think it was probably just blue stone, it's an algaecide. My guess: Shad are pretty fragile creatures, so the blue stone could have easily killed it, and carp (and grass carp) are much more sensitive to blue stone than other fish, so that may have been what killed it. If the chemical was used with the intent of killing fish, I would think there would be many more dead ones floating around, and it would make such a mess that I wouldn't think the city would do that.

I think it was probably just blue stone, it's an algaecide. My guess: Shad are pretty fragile creatures, so the blue stone could have easily killed it, and carp (and grass carp) are much more sensitive to blue stone than other fish, so that may have been what killed it. If the chemical was used with the intent of killing fish, I would think there would be many more dead ones floating around, and it would make such a mess that I wouldn't think the city would do that.

Yea i don't think they would put something in there that would intentionally kill the fish, It had to be some kind of treatment for the water. I just hope it doesn't bother the bass.

Yea i don't think they would put something in there that would intentionally kill the fish, It had to be some kind of treatment for the water. I just hope it doesn't bother the bass.

Bass should be fine. I have fished a pond that is intensively managed for bass, and they use blue stone.

That sounds like copper sulfate an often used algicide . I also have several lakes near me that are treated with this but have never seen a fish kill if used properly.

The chemical was more than likely blue stone (copper sulfate) being poorly distributed by unskilled folks.

Killing a carp is hard to do!

Tom

Thats my thought WRB, I haven't been back out since they treated. I just hope there aren't alot more fish floating. I watched these guys treating the water, if there was someone fishing in a boat along the bank they would just turn around and retreat where the boats weren't. I don't think these guys had a clue what they were doing, I'm also thinking carp are hard to kill, IMO the bass are more sensitive. We'll see when I get back out tomorrow and see whats floating. The fish that were floating were killed no less than 20 minutes after the treatment.

Went back out today and on a wind blown back the smell was unreal. I saw about 10 big carp at quite a few crappie floating all in a pile on the bank. I didn't see any bass but I fished from 7 to 12 and never got a bite.

Copper sulfate is nasty stuff, our water authority uses that on the res we fish that is a water supply for the surrounding counties. Fish go into a bit of a funk after it is applied. Bad thing is when they over treat, that stuff has a half life of about 180 days. We sometimes see it being applied weekly. They have since gone to the liquid version which is more easily assimilated into the water and has a less adverse effect in fishing, at least it seems that way to me!!??

is this even legal to do that??!!! thats not right!

Copper sulfate more than likely.  It prevents/inhibits the growth of algae and can give the water a bluish cast. 

Bales of straw do the same thing we put them in our pond its about 4 acres.it takes a few weeks to work but is water/fish freindly