All of the Fish in the pond Appear to Have Died Overnight! What the?

By
Real Estate Agent with Century 21 Beal, Inc.

I live in a subdivision and my house backs up to 1 of 2 ponds: One pond is located on the left side of the street and the other is on the right. When I went outside this morning to feed the ducks, I noticed over 100 Buzzards out by the lake on the Left.

Worried, I ran out to the water to find over 120 dead fish floating on the top of the lake or washed up on the banks. They were mostly Bass, but there was also Perch (sunfish) and Catfish. Even our single 10lb carp was floating dead along the shore.

The lake on the right is just fine. Strange because the water runs from the left lake to the right lake.

I called the maintenance person who has been with the subdivision since it was first developed over 14 years ago. He couldn't believe his eyes either!

If it was poison, you would think the ducks or turtles would also be dead. If it was lack of oxygen, you would think more would continue to die and surface in a slower process. Am I right?

We had a horrible lightning storm 24-36hours ago, (from this morning) and all I can think of is that lightning must have struck the pond...but that doesn't seem very likely does it? And would it cause that result?

I called the police dept, who said it wasn't their problem. I called the health dept, the sheriff's office and the Dept. of wildlife and fisheries...all closed until tomorrow.

Anyone had this happen?   Suggestions?

The pond is approximately 1 acre...with over 120 dead fish, do you think whatever happened killed them all?

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Tags:
dead fish in pond
unexplained event
what killed the fish in the subdivision pond

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Anonymous #45
Anonymous
lori

Iknow this is years later but our pond just did this and it is lack of oxygen...the larger fish require more oxygen so they died while the smaller fish were able to live.  Our fountain had broken causing the oxygen level to decrease and rain levels have been low causing the pond to lower which is also another reason for less oxygen.  I dont believe it is lightening ...same time of the year for you as well...heat of the summer. We have large bass floating and green algae ...no lightening has occured and this is what we were told happens to many ponds that are not real deep and no areation occuring..

September 12, 2010 02:25 PM
Anonymous #46
Anonymous
Raylene Lewis

Thanks for your post Lori - I think you are exactly right! I am concerned because the fountain is broken again and the HOA says they don't have the money to pay for it to be repaired--this means no more airation yet again!

September 13, 2010 07:10 PM
Anonymous #47
Anonymous
Debbie

This same thing happened at the pond on the golf course where I live I noticed the water got real low and the fountain has been off for weeks, the other day all the little fish were dead and made a white circle around the edge and began to smell real bad, now two days later they have the fountain running again...must be the aeration and lack of oxygen...

October 11, 2010 11:21 PM
Anonymous #48
Anonymous
gary

Hi, I have a small koi hatchery in the uk. About 10 yrs ago I went to buy new new stock at another hatchery, and the staff were out in boats dragging oxygenating weed out of the lakes. Their lakes were overstocked with fish, and they feared the hot weather would cause an oxygen crash. They were removing it so the fish would hopefully get acustomed to lower levels of oxygen during the day, and when the crash came it would not be such a shock. Sadly, the oxygen crash came too soon, and they lost all of their large koi. The smaller koi all found air pockets and survived

I have not read much of the replies, so excuse me if I repeat what others have said! The temps in the 2 ponds could be different, the deeper the lake the cooler it would be. Also stocking levels could be different. Colder water means more oxygen, and more fish means more demand for oxygen.

I turned off a tank holding about 30,000 week old fry by mistake, the temp went down 7C and they all died. Adult fish would not die from a 7C drop, unless it froze over. Was it very warm when it happened? I have seen a lot of ponds lose fish like this, and the deaths always happen at night,  always at the height of summer, yet lightning strikes any time, and any season?   

My guess is an oxygen crash   

November 19, 2010 10:01 AM
Anonymous #49
Anonymous
gary

Hi,

can I just add that if anyone does have a small pond in their garden, and it requires a pump and filter, sooner or later it will block up with algea or just go wrong. If it happens at night, at the hottest part of the year, you too could lose all of your fish. Why not purchase an air pump? They do not clog up, and in the uk can be put away for 9 months of the year, when the water goes cold.

gary

November 19, 2010 10:22 AM
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