Of course, this can be deceptive because some places have been known to sell short finned male bettas as females – and then you’ll be in trouble when you drop him into the same tank as your existing male!

There are two foolproof ways to tell if your betta fish is a male or a female:

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The first is to look for a little white spot that sticks out a little from just under her belly. This is the egg spot, know as an ovipositor, from which the female releases her eggs. Females will have this spot throughout their life, starting from around when they are four months old.

The second way, which works around 90% of the time, is to put your new betta fish in a separate small container. Then put the container next to one of your male betta fish. If your new betta (the one you are testing to see if it’s female) flares, then it is definitely a male betta fish. However, if she displays vertical stripes on the side of her body, that means she’s a female.

Do You Want to Ensure Your Betta Lives a Happy, Healthy Life?

If you answered YES to the above question, then I highly recommend you get Caring for Betta Fish: a Guide for Betta Lovers by Marcus Song.

This incredibly useful guide comes with amazing strategies, beautiful pictures, and much more. Your Betta Fish will thank you for the rest of his life! Click Here to get it now!