When is Mating Season for Betta Fish Betta fishes can become fertile at any point throughout the year, depending on her condition and her relationship with male fishes. Breeding season usually occurs from February to June when water temperatures increase significantly and breeding is more likely. An aquarium environment allows the couple to mate throughout the year but conditions may not always be ideal for breeding.
Female Betta fishes typically signal they're ready to spawn when their bellies swell with food, yet this doesn't indicate anything other than readiness to breed. When male bettas become aware that this female is ready, their male will begin acting more active with flaring fins and flaunting his stuff, as well as building bubble nests on top of the tank surface to show that he is interested in her as a potential mate.
As soon as he's ready to mate, the male will begin embracing her and fertilizing her while she lays eggs. These fallen eggs will eventually land at the bottom of the tank where they will be collected by him and placed into their bubble nest, providing a safe and sterile environment in which their offspring may hatch without threat from predators.
The male will remain nearby to watch over both the nest and eggs, keeping an eye out for any that have fallen out and picking them back up before returning them to their proper place in the nest. After they hatch, he will continue protecting and safeguarding them until they can swim freely on their own.
