How Do you Sex A Zebra Danio?

To sex a zebra danio, look at the fish's body shape and coloration.

Males:

Males are typically smaller and more slender than females.

Males possess a bright blue horizontal stripe on their bodies, while females have a more golden or yellow stripe.

Males have longer fins than females, with a slight indentation on the dorsal fin, and the back edges of their fins are a pale yellow or clear color.

Females:

Females are larger and rounder in appearance compared to males.

The horizontal stripe on females' bodies is usually pale or absent.

Females generally have shorter and more rounded fins, and their back edges are often darker in color compared to males.

Females that are gravid (carrying eggs) will have a noticeably swollen belly, making it easier to distinguish them from males.