Spawning Methods and Precautions (Medaka)

Many people who keep killifish want them to spawn. However, not many people know about spawning and what they need to do to prepare for it. This time, I would like to explain the method of spawning and its precautions.

Time of spawning

The spawning season for killifish is from late March to September. Approximately six months is the spawning season.Therefore, the spawning period is longer than that of goldfish, making it relatively easy for first-timers to try their hand at spawning. Another advantage of the long spawning period is that even if you fail to spawn once, you can try again.

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Suitable age for spawning

Since killifish have a short life span of only about two years, they are able to spawn at a relatively early age. They are ready to spawn approximately six months after birth. However, some killifish are still small when they are only six months old, and females may not be able to lay as many eggs at one time due to their small size.On the other hand, if the killifish has been alive for more than two years, it may not spawn or may produce fewer eggs at a time. In the same way, males should be able to spawn from around six months to two years.

How to distinguish between male and female

Even if you want to increase their numbers by having them lay eggs, it is useless without a male and a female, so make sure that you have a male and a female. You can learn how to distinguish between males and females from the following page.If there are too many males, add more females, but if possible, take their age into consideration when adding them. For example, if you have a 2-year-old female killifish and you buy a male killifish because there are no males available, but the male is still small and not suitable for spawning, it will be meaningless, so be sure to check the size of the killifish and add more.

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What to prepare before spawning

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The first thing you absolutely must prepare is a container in which you can keep your fry. We recommend a tank or tub, but if you do not have one, or if you have other arrangements, that is fine.Worst case scenario, as long as the container does not leak water, it is fine.The most important thing is to separate where the parents live from where the fry live. If the parents and fry live together, there is a possibility that they may eat the food by mistake when they come to feed, or that the larger adults may eat the food and not distribute it to the smaller fry. If it is not difficult, it is recommended to keep fry and parents in separate containers.If you do not have space for a separate aquarium and must keep the parents and fry together, it is a good idea to add more aquatic plants to the aquarium. If the fry are unable to eat food, they will be able to survive by eating water plants, which will also serve as a shelter and reduce accidents with adult killifish, thereby increasing their survival rate.

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Spawning Flow

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During spawning season, the female's abdomen swells. The male then swims close to the female with the distended abdomen. After a while, the eggs are released from the female's buttocks, but they are not independent of each other, but are clinging to the female's abdomen in a membrane-like substance.When this occurs, the snuggling male sprinkles sperm onto the eggs, causing them to become fertilized. Once the eggs are fertilized, the female attaches them to water plants or spawning nets.

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Precautions for spawning

The following are some points to keep in mind when killifish lay eggs,It is important to know the age of the killifish you are currently keeping. It is not necessary to know the exact age of the killifish you are currently keeping, but you can find out if they are suitable for spawning by knowing roughly how old they are, for example, "I bought them last year" or "I received them the year before last.We recommend that you know the sex and age of your killifish by late February, as an early start will increase the number of spawns per year and thus create more opportunities.

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