Last weekend I did a routine water change using the trickle method of adding waterthe winter (trickle it in using the ambient temperature of the pond to warm the incoming trickle as it enters the pond
Being 30+ year veterans at keeping Koi ,we have never lost a lot a koi to the winter yet,as a result of our water change I was horrified to find not one but 11 koi died and we dont know the reason for this damage . the water test kits all read normal Our clubs health officer spent a freezing hour testing water with me his assistant ,and eliminated everything we could think of . we checked over two dead koi the latest to die and the first we saw yesterday , they look alive but each when you look at the gills they both show dead gill tissue in patches with red in between that looks normal too us
We looked at what can damage the koi;s gills like that as either poison or some unknown factor
Believe you me we covered anything we could think of and more so but have come up drawing a blank with nearly everything we can think of .
Our oldest koi at age 30 + years hurts the most we though of him as a friend he was always first up for food and loved Orange as a treat .
Strangely all but one koi that survived are our latest koi i;e bought within the last few years with a 27 year old koi for company , why did these three survive whilst 11 others perished.
Was it the CyHV3 KHV virus ?, no its far too cold this time of year to be active , the same can be said for Parasites .
If it was bacterial the koi wouldnt be in perfect condition , strike that off the list
I changed my Policarbonate sheets this year could it have been those .
Im also experimenting with milk bottles shreaded and made into filter material so It might have been culprit but its been working faultlessly since last summer and should be alright .
Are there any long term koi keeping members of the Forum that has a working koi health Knowledge such as ourselves that could possibly answer this please or add fresh input as to the reasons why ?
Thanx
Dave 54
Being 30+ year veterans at keeping Koi ,we have never lost a lot a koi to the winter yet,as a result of our water change I was horrified to find not one but 11 koi died and we dont know the reason for this damage . the water test kits all read normal Our clubs health officer spent a freezing hour testing water with me his assistant ,and eliminated everything we could think of . we checked over two dead koi the latest to die and the first we saw yesterday , they look alive but each when you look at the gills they both show dead gill tissue in patches with red in between that looks normal too us
We looked at what can damage the koi;s gills like that as either poison or some unknown factor
Believe you me we covered anything we could think of and more so but have come up drawing a blank with nearly everything we can think of .
Our oldest koi at age 30 + years hurts the most we though of him as a friend he was always first up for food and loved Orange as a treat .
Strangely all but one koi that survived are our latest koi i;e bought within the last few years with a 27 year old koi for company , why did these three survive whilst 11 others perished.
Was it the CyHV3 KHV virus ?, no its far too cold this time of year to be active , the same can be said for Parasites .
If it was bacterial the koi wouldnt be in perfect condition , strike that off the list
I changed my Policarbonate sheets this year could it have been those .
Im also experimenting with milk bottles shreaded and made into filter material so It might have been culprit but its been working faultlessly since last summer and should be alright .
Are there any long term koi keeping members of the Forum that has a working koi health Knowledge such as ourselves that could possibly answer this please or add fresh input as to the reasons why ?
Thanx
Dave 54
