I’m 99.99% certain they’re goldfish (especially looking at the photo). I don’t think goldfish do “shagging” as such, I believe it’s more like kiss-chase, but I’m no expert… I think it would have had to happen in the pond. As breeding goldfish are very sensitive to environment and diet I’m delighted. I didn’t expect this to happen this year, in the new pond, and I haven’t been feeding them either. I think this means they’re settled in their new home!