First, the selection of broodstock.
When choosing a male fish, look for one with a vibrant body color, strong build, and a tail that flares out as it chases the females back and forth. This behavior is a sign of good health and breeding readiness. For females, pay close attention to the shape and color of their tail fins—these should clearly reflect the characteristics of the species. It's ideal if the female has already produced offspring, as this indicates she is mature and ready to breed. A well-developed, dark, and swollen abdomen is a good indicator of fertility.
Second, the breeding process.
As the female's eggs mature, her belly will swell and darken, which is commonly referred to as being "pregnant." When she starts swimming near the aquarium glass or exhibits unusual behaviors, it’s often a sign that birth is imminent. At this point, you may notice small fry and large eyes in her lower abdomen. To prevent stress and energy loss from the males chasing her, it’s best to keep them separate at this stage. Once the female is confirmed to be fertilized, move the males to another tank. As the birthing date approaches, place the female in a dedicated spawning box or container filled with aquatic plants. These plants not only provide a natural environment but also serve as hiding spots for the fry, reducing the risk of them being eaten. The spawning box should be set up a day before the expected birth. After giving birth, remove the mother immediately to ensure the fry are safe. Let her rest in another tank and carefully decide whether to allow her to spawn again, avoiding overcrowding and maintaining better control over the breeding process.
Third, feeding and selecting juvenile fish.
Proper care after birth is crucial for the survival and growth of the fry. Within a few days of hatching, they can begin eating freshly hatched brine shrimp. Offer food three times a day—morning, afternoon, and evening. By the first week, increase the amount of freshwater shrimp provided. After the third week, the juveniles will develop strong feeding habits and can transition to artificial diets or finely chopped food, leading to faster growth. Always maintain clean water and consider adding a few drops of methylene blue to help prevent diseases.
Juveniles can typically be sexed around three weeks old. Males can be identified by the spots on the base of their caudal fin, while females have black spots on their lower abdomen. Any deformities or signs of illness should be addressed early. After about two months, the guppies' colors stabilize, and their tails become more prominent. At this stage, it's important to select only the healthiest individuals for future breeding. If any fish shows an oversized body, small tail, asymmetry, or other abnormalities, it should be removed immediately. During this period, males and females are similar in size, but after three months, females tend to grow larger. Post-birth females will also be noticeably bigger. After careful selection and elimination, the best candidates for breeding can be chosen at around four months of age, ensuring the next generation of healthy guppies.
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