What gender is my betta fish?

This is not always the case but males usually have long fins and are the most common and females have short fins. I hope you have a 5+ gallon heated and filtered aquarium and not a cruel bowl.
 
More than likely it's a male. Was in a container by it's self when you bought it? If it was it's a male. If it was mixed with other bettas , it's a female. Females can be mixed ,males can not.
 
Males will have loads of color and long, flowing fins. When you purchased it, they should of told you. Read this site.
http://bettysplendens.com/articles/catview.imp?catid=853
 
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