Culling is the most important koi breeding technique to produce high-quality koi. Most of the breeder koi just breed too many koi thinking that if they breed many koi at the same time, they will produce beautiful koi. Others only think about breeding in numbers just to sell koi in high volume at very cheap prices. If this is how you are looking at koi breeding, you will not be able to retain the koi quality.
If you are not going to cull the koi tendency, the lower quality koi will be produced because these grow faster than beautiful koi. The reason for this is koi that grows faster than their siblings focus their development in growing not the coloration of their skin. These koi that grow faster than their siblings are called Tobi – they grow faster and eat their fellow siblings. So if you don’t cull them they will consume all their siblings and they will be the one left to grow. Based on my experience, not all Tobis are ugly.
Some will have a good pattern when they grow, so it would be ideal also if you will just separate them and let them grow. They are actually the best source for jumbo type koi since most of them have plain single colors. One of the things to remember in culling is that you should know the parents of your koi. Knowing the koi parents is the basis of culling the koi fry.
Steps in culling koi:
Showa first culling is performed two weeks after hatching.
Ogon about sixty days
Kohaku and Tasisho-Sanke deformed, plain red, white and black koi are thrown only ten to twenty percent of all are left. The second culling is done for the pattern and the quality.
Culling high-quality koi is difficult, especially for beginners. You need a good eyesight and experience. Try talking to experts and try to visit their farm when they are culling. There are also many koi books that can help you. One of my favorites is the Manual to Nishikigoi by Takeo Kuroki.
If you don’t have the guts to throw the cull koi you can donate it to schools and parks or sell it to the wholesaler. You can just sell them at a low price to beginners and small kids and I also give them as a freebie to my customers. As saying goes, beauty is in the eye of the beholder.
I share this article to Koi & Goldfish & More and there are group members who give their own views on this topic. some do not agree on this because it is an inhumane way.
These are the views… below.
Florence Jean Johnston says. It is a pity that they have to be culled and you couldn’t just keep all of them and then sell the ones that you don’t want to keep so that other people can have them as pets even if it means that you sell them cheaply or give some of them away for free as it is a waste of baby koi that may still become nice enough looking koi even though they are not by any means what would be classed as having any potential to become show quality.
Giving some of them away for free to people who would love to have koi for pets but who can’t afford to pay a lot to buy them would be the right solution to having more baby koi than you can afford to keep or are able to sell.
Nolan McEachern says I throw the ugly ones in a huge wild pond in our yard so they can live out they’re life
Mike Fish says. question for you. when it comes to culling your koi, do you do it because you have been told to do this way, or by person experience when you have allowed all to grow together until they were big enough to see what they are? You will lose i would say at lest half from death for no reason. so if you cull the rest as they claim then you lose another 80 present from first cull then another 60 percent from the second cull. if you keep doing that you will end up with nothing.