Hi, It does seem odd to lose all the fish so quickly. And to loose them that quick it probably isnt parasites etc. How big is the pond and what turnover rate do you have? As it could be a lack of oxygen in the water which is causing all these deaths. It is also suggested that you have 40lpm of air going into the pond per 1000Gallons. When you disinfected the pond what did you use? If you used pottasium permanganate without seperating you biological filtration this will have killed any beneficial bacteria in your filter, so high ammonia and nitrite could have killed the last few you added. I would suggest moving you remaining koi to a seperate pond or large tub with the pump and filter set up and draining your pond. Then refill and disifect the pond with a strong dose of Pottatium Permanganate and leave in until it has stopped working (gone brown). Then refill again and set the system back up. Keep an eye on PH etc for the next week or so and if its all ok add a couple of goldfish to see how they go, and if all goes well add your koi back in. Unless your pond is heated i would suggest not adding anymore fish this year.
Posted on Aug 17, 2005, 10:01 AM from IP address 82.38.196.144