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Allowing them to spawn in the pond is not a good idea. First, you will have what is sometimes called a "flock spawn" meaning the fish will all be poor grade pond mutts. The only way to insure even a reasonable chance at some half-way decent fish is to match trios (one female, two smaller males) of the same variety or compatable varieties.
spawning in your pond will also make a horrible mess of your water quality. Ammonia levels will shoot up, the water quality gets bad in a hurry. Spawning should be done in a separate pond.
Spawning fish in a pond with clay pots and rocks can cause her serious damage and death. Spawning is rough, females are bashed into the pond sides and into any obstrutions. She can be badly damaged or killed, another reason spawning needs to take place n a suitable place.
Dont count on being able to get the eggs out. They stick to everything in sight and most will be eaten by the koi.
How big is your pond....and how large are the koi?
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