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Waterbeetle Waterbeetle
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  • Posted on: 17/4/2011 17:56
Re: Koi ponds. Please read this first. #1
Many thanks 2010 & electrogear for those links to articles, very helpful indeed. Its great to be able to get such quality feedback. I've learnt a great deal.

My pond is only 1m deep, so as the article says a minimum of 5' deep I'm short by a largish margin (2/5ths in fact, around 3000 litres!) From the very helpful advice I've received on this forum I do not think I should submit any new koi to my care as I cannot make the pond deeper and cannot guarantee their welfare. It's the least such fish deserve. I stand more educated about this hobby and for the time being will stick to goldfish and frogs!

Thanks to all


Waterbeetle Waterbeetle
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  • Posted on: 16/4/2011 13:18
Re: Disaster, lost all 13 koi last year and colony of frogs! #2
Hi EagleC & 2010, an update for you ....have just tested my water PH balance and its shows around 6.25...I've just read that a good healthy pond water Ph should be around 7.25 - 9.5? Would this level reflect the high ammonia levels that EagleC kindly suggested it might be? (Got tadpoles by the dozen and no more dead fish but still managed to man handle one fish today) Thanks


Waterbeetle Waterbeetle
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  • Posted on: 16/4/2011 11:36
Re: Disaster, lost all 13 koi last year and colony of frogs! #3
Many thanks for your expert advice 2010,

It may not seem it, I did actually read up on keeping Koi before I bought them and there seemed some ambiguity on how to keep them, some said a murky muddy pond (as previously mentioned with mud/clad thrown in) was their natural habitat, I placed stones over the base of the plants & they all seemed to do well. (No, I didn't know they took in oxygen at night) The other side advocated a clear pond so the fish could be kept lets say in artificial conditions with no plants & if I remember correctly some chemical additions. I must say I followed the former as is clear from my monologue. The 13 fish actually survived for over a year before dying over a few weeks (the last 3-5 died all in one week).
I respect and will follow your advice if no others advocate trying something different.
Something I forgot to mention: Before the fish started to die I introduced some duckweed from my water butts, this soon proliferated and almost covered the pond quickly, I use a net occasionally to try and keep it down somewhat, my analysis was that this may be the problem,that by covering the surface it assisted with shade for the fish but may have stopped the oxygen getting into the pond or/and may have been poisonous for the fish? I have also varieties of freshwater snails.

Thanks for the links I will read with interest.

Filter: Filtoclear 15000
Pump: Oase Aquamax 16000
Airiator: Superfish Koiflow 20

I'm obviously throwing every last thing at this problem before taking your very valued advice.


Waterbeetle Waterbeetle
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  • Posted on: 15/4/2011 17:59
Re: Disaster, lost all 13 koi last year and colony of frogs! #4
Many thanks EagleC,

Blimey what an amateur I am. I didn't use the filter & pump much because it never cleared the water and always seemed murky. I have never cleaned out the filter (its a pressure filter) as didn't want to destroy the bacteria that had built up inside. Do you think I should clean it out? And do you think I should empty say half the pond water and top up with fresh? I shall check the ammonia levels with a kit I'll get tomorrow. If it is ammonia then it must stick around for months coz there's not been any fish in the pond for around 7-8 months if not longer.
As far as I can remember the guy sealed the glass pond though there was a small hole in the bottom which seems to have sealed itself.

Appreciate your reply


Waterbeetle Waterbeetle
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  • Posted on: 15/4/2011 11:25
Disaster, lost all 13 koi last year and colony of frogs! #5
Hi all,

New member here, so hello to one and all.

I'm turning to you guys and gals for emergency help please! Not a good starting point I'm afraid as I'm already starting to loose the fish I re-introduced to my pond last week!

History: 4 years ago I had a fibre-glass pond built 3m x 2m x 1m deep. Have only filled it up once and never cleaned it out. (I was trying to adopt a natural ecology balance as my thought process was that lakes do not get cleaned out yearly) I had a pump & filter system in place which has been used little as my initial readings on keeping Koi were that a clean pond is not the best environment and it was good to even introduce mud/clay into the pond which I did. Plants have all become well established including bull-rushes, also water snails and water boatmen are all in there. I introduced Koi into the pond and lost them initially and do not know why. After some time I introduced more Koi, up to 13 in fact. Last year they even performed at mating and I had eggs ! None hatched. I lost my big white Koi first of all back in early summer but couldn't find him and still haven't (heron is doubtful, a cat did take two or three though & left them on side of patio, heads missing, yuk!) I noticed one fish had a diseased fin and should have taken him out straight away but didn't as thought it was damage by other carp. They all eventually died by late summer 2010. My initial thoughts were that they were suffering a lack of oxygen (I had lots of oxygenating weed in place) as I could pick them up by hand and were drowsy or just sick? The frogs done very well last year. When the ice melted this year I found all the frogs dead. I was however really glad when I spotted the frog spawn a few weeks ago and since then I've spotted 3 large frogs in the pond. Last week I introduced 5 goldfish as a trial and alas I fished one out today who was still alive but on his last fins. Others seem drowsy and I could pick one up by hand. There's an oily slick on top of the pond which seems to come and go. I suspect some kind of poisonous weed or plant that I've introduced but am completely stumped. I've turned the pump and filter on to get the oxygen levels flowing. Here endeth this monologue and hope someone can shed some light on the cause of this disaster. Thanks



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