how to sex killifish

there are hundreds of killiefish, which one are you wanting to sex?
 
As Wolf said, there are many types and telling us which type specifically helps. However, with most killifish, the males will typically be more colorful, or have more vibrant coloration and sharper/more visible patterns. The females tend to be more bland in color, muted colors, faded colors and patterns. Females will also often be a little smaller, though this isn't the best way to tell.
 

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