A couple of weeks ago I walked out to my smaller pond, which is accessible to the public in this condo development, and someone had dropped off a large koi. I only had goldies in that pond before. The koi is probably 14 inches long and has an enormous girth. (Full of roe, maybe?) I left the fish in the small pond for a couple of weeks and today decided to move it to my larger pond in which there are several koi, though none as large as this one. The fish was hardly in the water before two smaller koi (about two years old) were chasing it. It has been about 4 hours now and the chase has not slowed at all. I'm afraid they are going to kill the new fish. I can't tell if they are bullying the new kid on the block, or if they sense that the new fish is ready to spawn and want to get to be the lucky dad. How can I tell the difference in love and bullying?