What does it mean when you koi fish shakes its head vigorously and gasps at the top of the pond?

I have recently changed locations of my pond in my backyard. However which was a month ago. but this one koi fish isolates itself from the other koi fishes. my koi fish goes to the top of the pond shakes his head while my other koi fish lay at the bottom of the pond and swim together!! whats wrong with my one koi fish?
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