koi problems

lindsay5510 · 21-02-2006, 11:33 PM

hi everyone
Â* Â* Â* Â* Â* Â* Â* Â* Â*Having a problem with koi this winter.Have lost about six 12 to 14 inch koi There doesnt seem to be any visable marks on them.I thought it was strange that the koi were fairly active in mid winter but not eating anything and one by one over the space of a couple of weeks they were found upside down at the bottom of the pond.Im fairly new to koi keeping only about a couple of years so im still learning Any advice would be welcomed
Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* scotman

extremekoi · 21-02-2006, 11:44 PM

Hi,
The first thing you need to do is check your water parameters, you need to test for Ammonia and Nitrite, you can buy test kits from your local dealer. It could be toxic poisoning that is poisoning your fish which means your filter is not doing the job it suppose to do, thats assuming you have a filter, it could also mean your flow rates are wrong. Could you give us some more details, the size of your pond, the size of your filter and how long it has been running for, also how many fish were in the pond ?
Could you also do some water tests for Ammonia and Nitrite and post the results, this is most important.

Welshkoi · 22-02-2006, 06:09 PM

hi and welcome to the forum.

As extreme said more details please. All of us on this forum will give you 100% attention in helping you save ur fish. Between us im sure we will find the problem

brettkoi · 22-02-2006, 06:49 PM

also let us know the construction of your pond is there any possiblity that cement is leaking into your pond,the ingredients in cement leaking over a long period of time can poison your fish, so can treatments in certain woods,do you have any photos?

Welshkoi · 22-02-2006, 09:09 PM

Even though it is still rather cold, dont suppose u introduced any new fish into the pond did you?? Hops its not anything as serious as KHV. That is a lot of esstablished fish to lose in a short period of time.

Welshkoi · 22-02-2006, 09:38 PM

unless ur water is around the 23* mark i wouldnt worry though

dazz2005 · 22-02-2006, 09:58 PM

Can you also tell us what yoyr water temp is at,,
Cheers
Dazz

lindsay5510 · 22-02-2006, 10:56 PM

hi all
Â* Â* Â* just in from work thanks for replies.My pond is 12 ft by 8 ft by 4.5 ft deep built with a liner with 2 rows of brick on top. My filter is 2 vortex units and a 50 gallon tank.The first vortex has brushes in it the second has flocor and the tank has a layer of alphagrog with sponges on top
the flow rate is debatable all i know is that the pump is an aquamax 10000 but not all is going through the filters about half is going straight back into the pond .My water temp this morning was4.5 degrees at the bottom and -1.20 at the top I have only got 10 koi left who seem to be alright at the minute hope this infomation is helpfull will post ph and other tests later
Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*scotman

john sarge · 23-02-2006, 06:56 PM

Hi

Have you stopped feeding them when the temperature fell below 9 degrees C ?

John

yamakoshi · 23-02-2006, 10:47 PM

HI Scotman,The best thing you can invest in is a heater,Your koi are struggling to stay alive at those temperatures,below 10 centigrade their imune system shuts down.Koi are not strictly cold water fish their body temperature is around 22 centigrade.Our winters are just too cold for them to function properly.You could try putting a cover over your pond to stop the wind chill,[leave an air gap] Unfortunately koi in unheated ponds sometimes do not make it over winter.All the best Carol.