GOLDFISH/KOI

Question
WHAT IS THE REPRODUCTION BEHAVIOR OF THESE FISH? A COUPLE OF MY FISH  ARE ACTING VERY DIFFERENT, THEY ARE FOLLOWING ONE ANOTHER MIMICIKING THE OTHERS MOVEMENTS AND TURNS RELENTLESSLY. IT SEEMS CHAOTIC. IS THIS WHAT IS HAPPENING OR COULD IT BE SOMETHING ELSE GOING ON? WHAT SHOULD I DO?

Answer
This is spawning behavior of the fish. You will usually see one being chased by others.  The one being chased will be the female, with the chasers being male. Sometimes the behavior gets quite agressive, where the female will be jumping out of the water and turning upside down, etc. Depending on the size of the female, this can be traumatic. I lost 2 females from spawning. If you fish are of the same size, they should be ok.  What happens is that the males need to get on both sides of the female and bang up against her to release the eggs.