Under normal feeding conditions, the body length of the Thai betta fish in adulthood is about 5-8 cm. There are also some people with good physique or proper breeding, and their body length can reach 10 cm in adulthood. In addition, there are some larger ones, which can grow to 15 cm. However, Thai betta fish over 10 cm are very rare, so most Thai betta fish are within 8 cm in length.

If breeders want to make Thai betta fish grow faster, it is best to provide them with sufficient nutrition during their growth and development. In this way, they will be bigger and stronger in size as adults.

Thai betta reproduce within 4-6 months of birth, and breeders can also judge by their body shape. Under normal circumstances, when their body length reaches more than 5 cm, they can reproduce. Thai betta breeds without seasonal constraints, as long as they live in a comfortable environment, they will breed.

When Thai betta fish breed, the male fish will dance courtship dance, and if the female fish accepts their pursuit, they will dance with them. If the mother fish doesn't accept it, they will dance until the mother fish accepts it. After the female fish receives it, the male fish will wrap the female fish with its wide tail and squeeze their abdomen to help them expel their eggs. After the female fish discharge the fish eggs, the male fish will be inseminated before, and after the insemination is completed, the fish eggs can hatch into small fish in 2-3 days.