i am planning on trying to spawn my koi this year.
i live in ireland so water temps dont rise above 15-16 c in the summer.
i have added a heater to my pond and the males have developed breeding bumps they usually do this in the summer but i have never extracted any milt from them. ive had these males the last two years and they develop bumps but no milt
there gill plates are like sandpaper but there are no raised bumps.there pectoral fins have bumps and are rough.is temperature a factor affecting milt or should the two come together.
i am also looking for info on spawning triggers.