Records of the largest betta individuals in the world show that wild bettas typically reach a length of around 10 centimeters, and in special cases, some individuals may grow up to 15 centimeters. In artificial breeding environments, Siamese fighting fish (Betta splendens) generally range from 5 to 8 centimeters in length, but those carefully bred can also exceed 10 centimeters.
There are significant differences in body size among different betta varieties. For example:
Plakat (PK): Known for their robustness, they have shorter fins and most fall within the regular length range.
Crowntail (CT): With spiky tail fins, their body size is similar to that of common bettas.
Veiltail (VT): Featuring flowing tail fins, their length is comparable to other varieties.
It's important to note that the growth of bettas is significantly influenced by breeding conditions such as water quality, feed, and living space. A favorable environment can help them approach their maximum potential size.