As they say in CSI, we’re a bit short on forensics; we have the unfortunate victims and a suspect – in this case a Cotoneaster bush – but not much in the way of other evidence!
Cotoneaster berries – and specifically the seeds – are known to be a mild stomach irritant to humans and there are American studies which suggest that some wild birds eating large numbers of them on a long term basis can be poisoned – so your friend may have a point. However, I’ve a niggling suspicion that something else is going on.
Lack of Oxygen?
Assuming that there’s no obvious signs of damage or disease on your mother’s fish – the most common cause of mass fish deaths is lack of oxygen. Now I don’t know how many fish there are in the pond – or what kind they are – but if the unfortunate 11 represents all or nearly all of them, poor oxygenation could be one likely cause. If your water recently went green, or a large amount of plant material has found its way into the pond – and this might include those Cotoneaster berries – the breakdown of the algae or other vegetable matter could have taken the oxygen out of the water. The same might have happened if the water level became unusually low or your pump packed up – but without knowing more of what the cop shows call the “circumstantial evidence”, this is only speculation at best.
Read more: Worried about lack of oxygen in your pond? Check for these signs
Water Quality
It is probably worth testing the water for all the usual things – ammonia, nitrite, nitrate and pH – if you haven’t already. This might give some clue as to what has happened and it may also be a good idea to clean out any settlement residue in the filter and change around a third of the pond’s water to be on the safe side.
If this still leaves you none-the-wiser, the only thing left to try is to cast your mind back over the last few weeks and see if anything out of the ordinary has happened. Have any pesticides or fertiliser been used around the pond, have you changed your brand of fish food or dosed your pond with some treatment or other? It is a bit of an exercise of grabbing at straws, but it might just make things a little clearer.
Fish Factors
The fish themselves might also be a factor in this; if they, like the pond and our prime suspect, the Cotoneaster bush, have also been around for a long while, their advancing years may have played a part.
Now I’m not suggesting that they all died of old age within a couple of days of each other – but like humans, as fish get older, their natural resistance diminishes and their ability to bounce-back drops. Their age could have made them less able to cope to some change in the pond that you might not even have been aware of – but without knowing a bit more about the fish themselves, this is pure speculation again!
The bottom line is, you may never know – but test the water and cast your mind back over events around the pond during the last few weeks and you might find your answer.
Read more:
Last Modified: May 13, 2023
Contact your environment agency or canals and rivers trust and ask them if they are aware of anything, especially if another person’s pond has been affected.
We have been losing our fish one a day for a year now nearly all the smaller fish but now our larger koi. Water tests all ok had skin scrapes tested at local koi farm all test show fine we have sturlets in pond they are fine. We have tried everything it is heartbreaking. My largest fish is now dying. As soon as we remove a dead fish another one becomes lethargic at the top of pond then goes to the bottom lays on its side and dies. We are down to a handful of fish. Both myself and my partner have always kept ponds and never seen anything like this. Staff at koi farm have tried to help but cannot see the problem
hello i have a medium sized pond,i started with about 5 fish and now have a very overpopulated pond but i have noticed one fish its about 6 inches long and it doesnt seem to be able to sit in the water it just lies on its side on the bottom,when i feed them it does sometimes struggle to the surface then it just floats back to the bottom,is there anything i can do and is it cruel letting it live like this. thank you derek
Hi I to have lost 7 fish over the last 2weeks and reading the rest of the Comments I’ve come to the conclusion that it’s the tap water my friend would only Refill his pond on certain days because he said that the chemicals that thay add Are very dangerous to koi .
Hi just changed the water 2/3rds of the pond this January because fish were gasping for air and I’m starting to lose now my young fish and some older fish about 4 to 7 fish a day pond is about 6ft x 15ft x 4ft deep just used tap water which iv used in the past any suggestions please thanks Dieter
January 2015 , had pond fish for years, never had any problems, this time of year fish are usually at the bottom, but last few days they are at the top dead , when you touch them they feel frozen, but it is sunny. am unsure if I have any fish left, I think maybe its geo engineering (Chemtrails)
We’ve lost more fish this year too. We inherited the pond 5 years ago when we bought the house but have educated ourselves on how to care for it. Each year we have usually lost between 3 and 5 after spawning. This year we have continued to lose throughout the year, it’s only ever one at a time and the others are all fine – until we find another one dead. No injury or disease evident on them.
i have lost 10 koi in the last 2 months. I find them dead in my skimmer box at least once a week . my pond is 1100 gal with a 18 foot desending steam and waterfalls to pond,,,use a 3200 gal pump from the skimmer box up to the upper filter box.. they come to me and eat fine,,,i also have 4 large airation stones spread around pond running 24/7….water tests perfect on all levels including ph…..some fish seem to be congregating under the waterfall but no apparent issues,,,but then i find 1 or 2 dead in the skimmer box,,,,baffling me…..have had my pond 10 yrs and have never had a problem like this before……
@Wobbly. Without much detail there is not much we can say but here are a few things to think about: (1) Are the other fish in the water all OK? If so then it’s unlikely to be a problem with the water, but test the water if that’s the only fish. (2) Could the fish be pregnant/about to spawn? Or egg bound? (3) Could it be dropsy? You would find your fish was not swimming normally if this were the case though, but may be something to watch (4) A genetic stunted growth syndrome where fish grow outwards instead of lengthways and hence become bloated? (5) Other infections such as a worm, bacterial or intestinal disease? If so you’d be advised to check out suitabe medications at your local aquatics supplier. A few things to think about there but you’re better off seeking expert help from someone who can see the fish first hand. Keep us posted.
What’s the name of brand of food your feeding the Fish with? 7 off my orange goldfish are now dead!
We have had fish for years in our pond and many babies. Pond is filtered, oxygenating plants, lillies etc. We are losing a fish a day and cant see any marks on them. Tested water and within range. Just want to know what else we can do to protect the other fishes. Looking on here at all the posts of fish dying it doesn’t look like there is an easy answer
We are so so sad This morning all our koi have died. My daughter is so upset! I just can’t understand what’s happened. They were so well looked after. ??????
Lost a fish 2 weeks ago now and just looked in pond 2 more dying they no spots on them
I have just recently changed my uv and cleaned my filter but my pond has gone greener than before I had my water checked and it is 7.4 which they said was fine But my fish don’t seemed to be feeding and staying on the bottom I have lost about 8 fish in the last 3weeks any ideas thanks rob
We’ve had a garden pond for the last 30 years plus but this year have lost many, many fish. For no apparent reason. Had water professionally tested, filters, air pumps infra red lights etc. Never had a problem before. Please help. Today. Fish papered to have blood under its gills! There are a lot of big fish but also quite young fish too. At a loss to know what to do.
my 2 brothers and I have ponds and this last week we have all had fish loss. Ponds in various locations, no signs just dead, my brother cleaned his filter and it was quite clean and no smell as it normally has this had been running a couple of months ? I am wondering if the water board has added something over this last week or so because of the hot weather ?
I have a pond 20ft x10ft.capacity of water is 18000 ltd.In past There are about 100 fish most of them are gold fish and 1 koi.I past 3 days 15 fishes have died.I introduced barley straws and elodea plants last week but I took them out after fish started dying.I cleaned the pond 2 days ago and changed 70 percent of water and also added dechlorinater and next day added blacket weed treatment .I also added pond aeration set and added extra pump to give a fall for extra oxygen.Second pump filters water through bio filter which I also clean every week. I had water tested before I and after I cleaned the pond but i am told there was nothing wrong with both the water.I found two fish dead this morning.I don’t know what more to do can you please help me .
if you have water lilies and they are overcrowded they are also like a jungle below the water line fish can become entangled and get stressed also it can cause gas to be trapped below water and pockets form. if this is the case then try thinning the plants below the water line with pruning clippers and open up some of the surface and get rid of the jungle below. if not look at the airaintion of the pond as to much exposed to sunlight will deplete oxygen levels again deadly for the fish
I had a near total pond collapse one year during a hot summer despite having a waterfall, fountain and filter pump going 24 hours per day. Turned out I was topping up/cooling down the pond with butt water which had far too many nutrients in it from the fallen and decaying leaves in the guttering!
Over the past few day we have lost about 12 fish from our pond. We have had the water tested which was ok and the water is crystal clear. We have a filter, pump, waterfall and fountain plus a lot of oxygenating weed. We are at a loss to know what is wrong. Help!,
I have a fish in my pond that has got extremely bloated, looks like its about to explode, but is still swimming about normaly,what could the cause of this be please
Our pond fish were dying at a rate of three or four a week over about a three week period before we discovered a large toad who was swiftly removed to a neighbour’s wildlife pond. All frog/toad access to the fish pond was removed. No fish deaths since and we firmly believe that we identified the culprit…
hi last year i cleaned my aunties pond out it was very neglected i removed a good three inch of sludge from the bottom all was going fine until this summer when the fish started dying the pond is around 2000 gallons and filtered by a hozelock easyclean filter
Hi, I have a 1000 gallon pond, well established, well filtered and aerated. Trouble free for years until the last two weeks. Goldfish are dying daily and showing signs of swim bladder problems. Did a whole pond antifungal and bacterial treatment. One week later did a 25% water change. Isolated fish showing symptoms and treated with swim bladder medication. I have been checking water quality every two days and ph, nitrite, nitrate, ammonia etc are all good. The really strange thing is the koi in the pond are all ok with no symptoms or deaths. Any ideas what could be killing the goldfish? The only trigger I can think of is a cold snap and the pond iced over, however I kept an area clear with aeration so would assume gas exchange continued without too much change. Please help, I am stuck!
hi I’ve been keeping pond fish for a long time now fish in pond are carp roach and tench , since the hot weather I’ve had 24 roach die and one koi in a mater of 2 days. all the other koi are fine except the roach , the water is green so im thinking as worm water doesn’t hold as much oxygen as cold water I think this is the problem so is the green water so im changing almost all the water to see if this stops it .
Hi I have had 12 roach and 6 goldfish in my pond ( 7ft x 3ft x 2ft deep ) for 4 years. They have always been lively and healthy, and have grown well. Over the last 2 weeks all the roach have died but the goldfish are ok. so upsetting, any ideas thanks
my fish always congregate under our waterfall and spend hours there together is there a reason for this
My koi are all dying. We have lost 8 since the beginning of the year, most since the really warm spell in July. Just lost my favourite fish, 18+ inches! Had him since he was 2inches. Lovely fish. No visible signs on any of them. Water tests all good. Plenty of filtration and oxygen. Local koi dealer reckons koi herpes, so all of them will die. Not affecting sturgeon or our one goldfish. We have over the last two years put 9 small Japanese koi in the pond from reputable dealer, thanks to heron only 4 left, but one of those died yesterday. We bought a filter system from e-bay earlier in the year, this was all dry and cleaned, we understand herpes can’t live if it dries, so hope it is not that. Understand Japanese koi worst thing to buy, as these are usually the problem. Is there any cure?
Hello, I have a natural pond 10m long x 7m wide, 1 1/2m deep with approx 90.000lt water taken from the local river. I have for sometime a trout and a salmon-trout of about 1kg each. Last week, I have bought at a acquacoltura farm, 4 young tench and 5 trouts of about 150g each. The problem is that two of the tench seems to have developed some bubbles on their skin and they can be seen still, among the aquatic water plants just below water level. The rest of them, I have yet to see them because the water at the moment is rather turbid “not clear”, because of a recent heavy rain falls. Your help would be apreciated… many thanks
We had twenty kio and one goldfish and four cat fish in our pond. they were are doing fine. The last week we have lost all but the goldfish. we dont know what went wrong. do you have to have chemicals in the water are what do you have to do to keep your water clear and keep your fish alive?
I have had my current pond for 5 years. It is 1300 gallons and just under 6 feet deep at its deepest point. In the last 2 years fish keep on dying, older fish at first died, many where over 15 years old (transferred originally from a smaller pond). the other new small fish I have introduced have all died. I have tested the water quality several times at it is OK..?.. the [plants in the pond are thriving. I have a UV filter which keeps the pond clean. Two weeks ago after having the pond empty since January, the water was tested, it was fine, I bought 10 small goldfish to try. after about 4 days the fish stated looking lethargic, day 6 or 7 I could scoop them out with my hand easily, now some are gasping at the surface and look as though they are struggling and in discomfort. there are no visible signs at all of parasites, spot, cloudy eyes or skin, they look healthy fish. What they have not been doing since introduction is eating food, and I bought fresh food again when buying the fish. I have overcome some diseases within the pond and my tropical fish tanks over years, but this has me confused as I have done everything I think I should be doing? any help appreciated.
I’ve lossed 17 fish in two weeks, including 20year old koi. Water test fine. Got pump, filter box & 2 airiaters. Fish I have left are on the bottom, listless with find closed. Sad to see but don’t no what to do for them. Any ideas anyone?
So 2 of my fish are acting very strange. They will swim around like mad in a circle and then jump out of the water a couple times and then they just freeze and sink to the bottom. Is there anything I can do? I isolated them and have a air stone in there iso tank but I’m not sure what I’m doing wrong.
I recently had my fish pond deep cleaned. The fish were transferred to a holding tank filled with the dirty/silted water from the pond. They made a very good job of cleaning the pond but before the pond was filled with De-Chlorinated mains water, about 20% of the dirty/silted water from the holding tank was pumped back into the pond, the fish were then returned before filling the rest of the pond with De-Chlorinated mains water. When I mentioned about returning the dirty/silted water to the pond I was told the fish needed it or they could be shocked with fresh water. Is this correct? as the water still has suspended silt gradually falling to the bottom of the pond. The water is not nice and clear as I had expected.
@VinceUK. Warm temperatures often cause problems with pond water but sudden changes can also be a shock to the fish – if you want to change the water, just change half of it slowly. Check also whether you have too many fish in the pond or whether there is uneaten fishfood starting to rot. Plants like water lilies will provide shade and a submersible pump will also help to keep the temperature down while a filter will help keep the water clear.
we have just doubled our pond size, were very careful to use all the right water cleansers with the tap water when we refilled, we have pump, waterfall and u.v.filter ,have reeds, lilly and water iris, but still one by one my eight new fish have died! someone help please!
Spring cleaned my 800 ltr pond with borrowed pond vac, thinned out elodea plants. Cleaned filter (submerged with integral uv) and tested water for all the usual suspects. Oxygen level 12ppm, nitrate and nitrite both 0, ammonia 0 ph nuetral. Put 2 new 2 year old goldfish in with the 6 10 year olds and the 2 tench. Within 2 days all the older fish developed every fungal desease ging and pop eye, cloudy eye etc. All spent about a week on the bottom not feeding and lethargic. I treated the pond with Tetra medifin and introduced additional aeration. The fish became more active but despite 2 Medifin treatments over 10 days the deseases rage on and I have lost all but the biggest of the older golfish and 1 of the tench. The 2 younger and newer fish are the only ones not looking too bad and are still active and feeding. Any ideas as to what might be going on? Also what do I do to make the pond safe to restock eventually.
Although my fish have lived in my pond and reproduced here successfully for 12 years, all of a sudden about 15 of the largest fish and on small died, but what has me confused, is that 2 small ones were still swimming at the bottom. Wouldn’t they be affected in the same way as the large fish (goldfish)?
I have a large natural pond, 35×24 yards average depth 3 feet. Large gravel filter the size of half a tennis court. Water great, all tests show perfect O2 levels and water meets all other tests. Seven years with one or two losses per year, about 500 fish all but two are carp. 18inches to this years spry.. 300 died overnight. No berries, no crop spraying, no run off, no nothing except a hot day, for England 75 and a cold night 37 with heavy rain that night. Lost another 50 the next night and so on, only a few left now. No marks, no parasites, no where spot, no yellow gill. HELP!
Hi I have had my pond for over 10 years, natural fish deaths have occurred over this time but this year I have lost 7 Koi, I am lost for a solution, water tests all ok , filter good, good oxygen, the symptoms … stop feeding, become listless, all gathering at one end of the pond pretty motionless, began in July. There was no obvious signs of a problem, a little flashing , so i treated for parasites and flukes, but still the deaths continued, one Koi left , the largest, can’t do much now , hope it survives the winter but I doubt it
Speedy…we don’t really have enough information from you but as we have been getting so many questions in about pond fish dying, we will be providing a new feature with frequently asked questions on this soon!
Would it do any harm to increase the size of the filter box now my fish are a lot bigger. The present filter is not keeping the water as clear or blanket weed free as it use to?
We’ve had a Koi pond for almost 30 year’s with no problems until this year. So far we’ve had sudden deaths of 2 very large and established koi shortly followed by several smaller one’s. I bought 3 replacements and already one of those has died..no symptoms just lopsided floating then sinking to the bottom and then dead on the top. My Pond guy is equally baffled…the water samples each week are fine but every few days another one has to be hoiked out. We live in Bournemouth any other locals having same issues?
Hi need some advice. My 20 year 1500 gal pond has good water quality (test 2-3 times per week). Good filtration etc. I keep 5 Orfe, a couple of bred in the pond around 15 years old Goldfish and Koi. The Koi ranged in age from 3 to 15 years old. My pond was healthy. I added 10 x 4″ koi 2 months ago. Within 2 weeks I had lost a couple of the 4″. I wasn’t to worried as no sign of disease but more closely monitored and prepared to treat as needed. By 4 weeks I’d lost all 10. I’d treated for broad spectrum bacterial infection but didnt stop the dieing. Still no visible sign of disease. Now the real heart break begins one by one my adult Koi are dieing. They stop eating, activity levels fall off and after a day or two they die. There’s no rot, fins are intact, no weight loss etc. No sores, or any sign of a parasite, no excess mucus etc. The Orfe and Goldfish remain active. So far I’ve done all the normal stuff, water quality, filter check, adequate water flow, filter cleaning as required, anti bacterial, white spot treatment, just in case. I’ve treated for parasites. As medicine brand is often a question people discuss for the potential parasite/fluke, it wasn’t Kusuri or NT Labs. Albeit I now have both. It was a more general parasite treatment active ingredients Formaldehyde, Methylene Nlue, Malachite Green Oxalate. So before I try one Fluke treatment now that all previous treatments have had time to subside. Does anyone have any other ideas as to what is killing only the koi, especially as dieing is so spread out.
Hi There hope you can help I have a pond 24m x20m x 3 to 6ft deep and in the last 2-3 days have lost quite a few fish ranging from 20lb to 1lb. In the hot weather they seemed to be fine and still feeding. But since we had a large down poor of rain and a considerable drop in temperature they seem to be slowley dying. Do you think this is the cause as they look healthy with no obvious marks or desise
Hi, In the past week I have found between 1-4 dead fish in my pond each day. I have checked the water quality and all appears Ok. I have kept the pump on 24/7 and have an added solar pump to provide extra movement. I have several very large Koi which thankfully have not succumbed it has mainly affected the gold fish and one golden Orfe. All fish appear perfect, just dead. Its very disheartening to see perfect fish die in front of you and would really appreciate any ideas.
I had 4 koi die within about 2 weeks of each other, thought it was down to spawning for the 2 females and the males being brutal. Then the 2 males died. No obvious signs of damage but they were gulping around the surface a lot. Couldn’t have been lack of oxygen as I had 2 air stones pumping 70 litres per minute in there. Anyway long story short I think it was a chemical the farmer had used to kill his crop ready for the next crop. There more I think about it there was a chemical sheen on the surface and I put this down to spawning and protein at the time as there was foam present too. My advice is if you live near any fields or farms check when your farmer will be spraying his crops and cover your pond before during and a little bit after its been done. Best of luck to you all
My fish are dying, too. No reason. It started when I purchased a new bag of food (same brand). May I ask what brand food y’all are feeding your pond fish?
Hi someone stole our water lily and cut the net over our pond about 2 weeks ago since then we have had 11 fish die some floating some of the bottom of pond we have a waterfall and 2 pumps we still have one lily and plenty of other plants the water is clear what can cause there death
I have lost 6fish in the last few days they all seem to have damage to they side like they have been attcted is this potable ? I still have 4fish left
Hi, I have an 8ft x 8ft pond with 10 adult Sticklebacks and 10 Rosy Red Minnows. Recently I added some Aquaplancton to get rid of the algae and blanket weed, but now I cannot see any adult fish at all, I haven’t seen any dead fish. My Sticklebacks have had babies and they are still there, but what could have happened to all the adult fish?
I have kept my koi for over 30 years no problem but the last week has been a disaster I lost a monster 25lb koi followed now by 3 small ones and I have another one very stressed he is black and white but the white is showing raised blood cells and veins also he is always on the surface with head facing down It’s very upsetting my pond is 2600 gallons with huge filtration and 4 air stones plus a Venturi return and a 2 inch return from a trickle tower My water has tested perfect but the temp did rise to 29c recently but now it’s 22c I am at my wits end and very upset and my wife is in tears
My pond is 7 years old After having to enter the pond I am losing Fish ..so far 12 ..I thought I could have stirred the bottom up and effected the oxygen level..added another pump no help lost three last night. No chlorine present the pH is a little low to neutral. All of the fish are the oldest one in the pond no young ones. Nothing has changed from the past years ..I have gotten in the pond before but this has never happened. They are at the top gasping ..but I have seen that before. The fish are eating well …please help..Oh my pond is 18 by 12 and 4.5 deep in the middle with a 2 foot shelf…..
P.S. 2 ponds have been established for 20 years no problems before and 1 pond 12 month old
I’m really annoyed another of my fish is dead,opening bag of food the Fish food smelt really strong
We have had a large pond for year and have recently lost 4 f all a decent size now tonight I have found our 10lb koi died no signs of disease any suggestions pond is well oxygenated
I have a garden pond about 15 cubic m of water,120l/minute aeration,600 liters of k1 in 2 ibc home made filters,whith another 220 litter filter and 3 aditional filter boxes whith japan mate .In pond i had for 3 years now 12 big carps,and 700 babies from past year.I use ground water from 15 metter depth.Never had more then maximum 10 little fish dyng per year.Last week all the small fish start dyng,about 50 per day..after 2 days i change 70 procent of the watter ,put 25 kg of no iodized salt,but almost all little fish are dead now,and i big female carp .I have many plants,my watter hyacinth ware affected by salt,and i put them to recover out of pond.The pond is in Bucharest,Romania.All the smal fish are dead now,and they have no injuries,no red spots,nothing,look like same mysterios poison killed them.The planes are sparyng heavy chemtrail,the water teat looks fine,but can not measure aluminium oxyde and barium who are sprayed upon the city.I am crazy,or what ?What can be the reason for fish dyng,please help me ,all tests are fine,no amonia or nitrite,oxygen ok,temperature of water 20 degrees celsius.Help me please whith same advice.
I have a 10 year old pond approx. 10,000 gallons, 18 x 35, 4 feet deep in the middle. I have been losing 1 -2 fish a day for the last 2 weeks and don’t know why. The fish are 5 lbs to 40 lbs. Great filtration. Bio bead filter. Solid separater. UV light with new bulb annually. Waterfall. Couple plants. Fish lying still at edges of the pond, not eating over the past 2 weeks. Surfaced scum they tell me is from spawning for about a month, yet my fish are dying. No sign of any problems on the fish. Pond is extremely clear. Half shade and half sun yet fish still dying. 0.13 salt level. No traces of nitrate at all. PH 7.5. Haven’t lost a fish in 10 years. Pond is maintained and enjoyed every day. I don’t use chemicals or fertilizers in my yard. Appreciate your advice.
We have a pond in this house a year we had ,had nothing but problems we brought our fish from our other pond but now everytime we change the water, or weather rain our loi are dying we done ph things we feed well they are our babies and they keep dying can someone please us keep them Sit
Same here… Woke up yesterday morning 2 wore gone and one sick… The only thing we could think of was that something toxic got in the water… We haven’t made any changes in food water or anything lately so we took most of the water out and replaced it and they seemed to be better… The one sick has been separated and we are struggling with it… This is so much more worrying as they weren’t the smallest ones.
I added pond salt to my fish pond approximately a month ago. I calculated the pond gallons, had another person check behind me and followed the exact directions, but I did cut back on the salt. My fish have been active, jumping, and ready to eat bubbling and swarming the surface for food. Just as they always had before. No sign of a problem. I went out this afternoon and all of my 40 fish were dead . Large and small fish. Why? If the salt was to much, would they have lived a month and continued to act normal? Would they have died all at once or a few at a time. I did recently purchased a new bag of food. Please help me understand. Thank you
Hi iv had a garden pond for years the normal run of the mill fish goldfish, koi , roach gudgeon, all of sudden I’ve lost all my gudgeon family and now I’ve started losing my big roach no signs of damage all the others are so far ok. Thought it may be the fireworks Any on any ideas pleased
Were the fish originally in your old pond? Did the water temperature changed dramatically when you build the new pond etc? Sorry we don’t have the perfect answer to this as there are so many reasons why pond fish can die.
We have had a pond for years and have had no problems until about 6 months ago,we bought several new fish and they have now all died ,even the ones we all ready had in the pond have all died,we have cleaned the pond out which has not helped.we have plenty of frogs and tadpoles.Any idea what the problem can be.
We had 9 perfectly healthy Shubunkins in our garden pond until I cut back the irises growing in the pond Then over the last 2 days all 9 have died and found floating on the surface ? lack of O2 or polution from the irises? If I want to replace them next year should I clear the pond out completely and start again?
pond fish dying day after day all look fine no obvious disease water good, pump on. only clue is a history of herpes in the area.help.
My fish have been dying 1 or 2 a day for a week. I did clean the pond out a couple of weeks ago of some pond weed which I do every year as it accumulates if not kept under control. Could this be the cause? Would appreciate any help from anyone. Thank you.
Hi just recently I changed the water of my fish pond. I also added weed cleaner into the pond the first time after I changed the water. But since then two fish have died who didn’t look unwell. My fish pond is new only about 16 months since it was first build so the filter etc is all brand new. I am very worried for the rest of the fish and I need some good advice. So please reply to my enquiry as soon as you can. Thanks
Have a wildlife pond in my garden have 3 spin sticklebacks and other wildlife today found two sticklebacks dead not sure why, could it be the water as the hot water continues have had to use tap water. Please advise Clare
I am currently losing a small koi every day. The larger ones seem ok but it’s not great I have lost 20 or so now. I have tested the water and it all seems with normal ranges the water has added oxygen and also oxygenating plants. I have seen on some sights that I maybe should change 10% of water per week making sure I remove chlorine and ammonia. Do you have any suggestions
Had our fish for years no problem had we had many babies. They all seem to be growing beautifully, lively, now we are having one fish dead every day. So upsetting. Pond has oxygenating plants, filter, lilies for shade. Water tested and levels are within range. Looking at all the posts on here seems are problem everywhere. Just need to know why to save the remaining fish
Hi just changed the water 2/3rds of the pond this January because fish were gasping for air and I’m starting to lose now my young fish and some older fish about 4 to 7 fish a day pond is about 6ft x 15ft x 4ft deep just used tap water which iv used in the past any suggestions please thanks Dieter