I woke up this morning to find the koi in our fish pond in an unusually frisky mood. They were thrashing around, chasing each other and jumping out of the water.
An hour later the previously clear pond was covered in a bubbly scum.
Seemingly this is normal reproduction behaviour for koi. The males become aggressive and chase the females around the pond, bashing into the females to force them to release their eggs. Once released, the males spray the eggs with their sperm, hence the mess in our pond.
If all the eggs hatch into koi-lets we’re going to need a bigger pond!