Do danios give live birth? No, the zebra danio is an egg-laying species. When we say “pregnant,” we mean “with eggs and ready to spawn.” In the wild, this species spawns during the monsoon season, when the increase in rainfall results in a change in the water temperature.

How long do danios carry their eggs?

They can carry their eggs for any amount of time really, and it all depends on when they are ready to lay eggs and if there is a male around to fertilize them. Technically speaking, if there are males around and they are developing eggs, they should not be carrying them for more than 4 days.

How do you tell if danios are breeding?

Since you can't tell if the eggs are fertilized, the best thing to do is watch for eggs at the bottom of the tank. Once you see eggs, you know your danios have spawned and you can move the adults back to their regular tanks.