Tropical Fish Keeping banner

1 - 11 of 11 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter #1
Eversince I ran a UV filter for my outdor pond my fishes seemed dazed, preferring to stay motionless at the bottom. I've lost 3 Kois in 3 days and it's heartbreaking. They did not seem to get out of this state even when the UV is switched off. Please help me. Thank you.
 

·
Registered
Joined
·
13,248 Posts
Hi and welcome aboard.:wave:

What are your water stats? It will also help us know what is the cause behind your situation.:)
 

·
Registered
Joined
·
2,716 Posts
A UV sterilizer should be plenty safe to run on an outdoor pond with koi, considering it is hooked up properly. Besides ammonia, nitrite, nitrate, and pH readings, can you also post KH and temp? It sounds as if shock of some sort could be the issue, but without knowing any specifics about your situation, it's very difficult to do much to help you.
How big is your pond? How many fish? How big are the fish? Was there a specific reason you added a UV to the pond? Also, what part of the world/country are you from? Weather changes can also play a big part in pond keeping.
 

·
Registered
Joined
·
4 Posts
Discussion Starter #5
Hello everyone. My apologies for the lack of info. I live in Malaysia with a tropical climate of 36 deg celcius all year. My pond size is 4 ft x 3 ft x 2 ft with the water stats of Ph=7.5, No2-N<0.5 mg/l, No2<1.6mg/l, NH4 & NH3=0.
I have 8 Koi fishes measuring 6 inches. I ran a test with a testpen which proves negative for shock. Appreciate your assistance. Thanks.
 

·
Registered
Joined
·
706 Posts
Wow, 36 C is very warm! The Koi enjoy cooler temperatures. How long have you had them and have they always thrived in warm water like that? Just a guess, but they may be experiencing lack of oxygen. Try adding more aeration (current) to your pond. Good luck!
 

·
Registered
Joined
·
4 Posts
Discussion Starter #7
Hi Tracy,
I installed a water fountain which helped the aeration. The Koi has been with me for more than 6 months. They were doing fine until recently. The only difference is that it has been raining a lot this past month.
 

·
Registered
Joined
·
2,716 Posts
That is quite a few koi for that size of a pond... not only will the temp cause problems (as the fish get larger they need more of everything and put out more waste), but water quality can also fluctuate rapidly. Rain water tends to be cold going in... and with water temps that high, a rapid decrease in temp can cause shock in the fish.
I see a number of possible issues going on...
 

·
Registered
Joined
·
4 Posts
Discussion Starter #10
Hi bettababy,joeshmoe,

The variation of temp is only about 5 deg celcius when it rains. Today I lost another one, I'm down to 4 now. The depth of my pond is 2 feet. During the past 3 days the water is a bit frothy. It came back even after recycling. Clould this be the cause? My pH is still 7.5. What other test can I run to check this? Thanks.
 

·
Registered
Joined
·
2,716 Posts
I would test for ammonia, nitrite, and nitrates. One thing many forget about fish keeping is that these animals grow, and what was fine for an environment when they were young doesn't always remain so. That is still a lot of koi in a pond of that size, and as they get larger, so does the output of waste. In an outdoor environment there are other factors that play into the waste issue... leaves and other debris that get into the pond can raise waste levels quickly. The weather can contribute... washing other forms of waste into the water, too.
As for the water temp... 5 degrees is a lot for a fish to handle if it's a quick change. Without being able to examine one of the fish, or perform an autopsy, diagnosis will have to come in other forms. How I wish I could see them. An autopsy can tell so much.
I know this is a horrible thought, but could someone have put something into the water? I have seen cases of poisoning, intentional... where the fish have died for no apparent reason, and we weren't able to determine cause of death until we performed the autopsy. In the instance I mention, someone had poured a clear chemical into the water, I forget which chemical... but overnight, perfectly healthy 12 - 14 inch koi suddenly dropped dead. This woman lost 10 fish.
Other than poisoning, water quality is the only other thing I can think of. Temp WILL have something else to do with it, also.... As the fish get larger, they consume more oxygen. Oxygen depletion will cause the symptoms you have described as much as will waste issues or poisoning.
 
1 - 11 of 11 Posts
Top