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Tnx. Let me tell you how we did it this year.
We've got a polyester tank (2,2m x 1,2m x 0,9m) in which we pumped pond water a few days ago. We let this stand quietly for a few days (to grow algae etc.) and then put both the parents in. They have swum in this tank for 2 days before they started eh... how do you call it, ****ing ? When we had eggs, we put the small pump (2000 liter / hr) on, so pond water goes through the tank. The exit of the tank is covered with a spunge. This way the tank is connected to the filtered pond water, and ammo and nitrite are no problem. I'm measuring these values daily and they are only a little bit elevated (so 10% water is refreshed daily).
Last year we let the koi breed in a swimming pool and put a "moving bed" filter on. Don't know the english word for this filter, hope you understand what i mean, it's KNS with aeration. Ammo and nitrite were only high during the time the eggs were not hatched yet. We had about 50.000 young fry and started culling too late, so fry died after a few weeks. In the end, we have kept 50 koi alive, of which 10 are of acceptable quality. They have only grown to 15cm and are now swimming in the pond.
So the lesson not to keep too many fry, we've learned already last year. That's why we want to know which ones to cull first. By the way, the out-culled will go into the plant pond, because we don't like to kill living beings. The mutulated will be fed to the big koi.
I'm not certain if i understand the feeding tips for the first days. My intention was to start hatching 60 grams of shrimp fry a day. Is this good ? Maybe too much ? Last year we made the mistake to feed only once a day, but that will be multiple times a day this year. Do i need to give supplementary food besides the algae water and the shrimp fry ? And is it true that daphnia will kill fry ? We've put living daphnia in the tank a few days ago, with the intention that young daphnia will be eaten by the young fry in a few weeks.
Bad news today: it looks as if not many eggs are fertilized. A lot of white eggs can be seen and very little transparant eggs. Let's hope for the best.....
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