Is there any way to tell the difference between a short finned male betta and a female? I want to buy a short finned male but don’t want to end up with a female from the breeder. Thanks.
A: The difference between plakat (short finned) male and female Bettas can be a little difficult to discern if you don’t know what to look for. Fortunately, there is one sure-fire way to tell the difference.
All female egg-laying Bettas have an ovipositor. This is the tube through which the eggs are deposited and it happens to be visible on the underside of the Betta. To the naked eye it looks like nothing more then a small white dot centered behind the ventral fins. If the ovipositor is present the fish is female and conversely a lack of an ovipositor indicates a male Betta.
One thing to keep in mind is that the ovipositor may be a bit harder to see in younger females.