Bettas reproduce in a unique and fascinating fashion. The male will blow hundreds of bubbles at the water’s surface and create a floating nest. He then tries to court a female by spreading his fins and putting them on full display; his colors will be in their most intense and impressive state as well.
If the female is receptive and ready for romance her coloration will change and she will be covered with dark vertical stripes. Her stomach will also appear rounder as her body starts producing more eggs. The courtship can get rough with a lot of chasing and nipping, resulting in some torn fins.
When the couple is ready to spawn they will swim up to the bubble nest and entwine their bodies. The male will squeeze the female to release her eggs, which he fertilizes. He quickly gathers the fallen eggs with his mouth and places them into the nest. After mating is completed the male will guard and care for the eggs, chasing away all comers including the female. The eggs, which can number up to 500, hatch in 1 to 2 days and the fry are free swimming in about a week.