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One of the difficult things which a fighter fish keeper faces is in determining its gender. It is more difficult in case of young fighter fish. Even the betta fish experts fail to determine the gender of fighter fish.
The wild Siamese Fighting fish can be found swimming amongst the inland waters of the Orient. It is native to Thailand, but can be found worldwide in pet stores as a domesticated fish. Hargrove
In Experiment 1, female Betta given daily injections of testosterone T for 9 weeks acquired anatomical features characteristic of males as indicated by changes in fin length, body coloration, and gonadal morphology. These findings suggested that a potential for sex reversal exists in females of this species. In Experiment 2 we measured changes in aggressive behavior during testosterone-induced anatomical changes.
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Metrics details. In Southeast Asia, males of the Siamese fighting fish Betta splendens have been selected across centuries for paired-staged fights. During the selection process, matched for size males fight in a small tank until the contest is resolved.
Taking the following characteristics into account should help you determine the sex of your Betta. Keep in mind that juvenile fish may not display sexual differences. Ideally, compare mature specimens of the same species and color, and compare multiple factors rather than using a single trait to determine sex. Males generally display more vibrant colors than females, but females can be quite colorful, too.
You can find betta fish sitting quietly in tiny cups on the shelves of pet stores everywhere. One of the most obvious and distinguishing features of the male betta, also known as the Siamese fighting fish, is his color. The males of the species have bright colors; the females tend to be rather plain, almost mousy, with dull-colored fins that match the colors of their bodies.