Simply Koi and More Koi

I have had a koi pond for a year now. They now hav spawned twice. On monday I put 4 more koi in my upper pond which is my main koi pond. Now the new 4 fish are chaseing my female koi but My male koi (these 2 koi I have had for a year) is right beside her and looks like trying to prtect her.. Now her...