I have 6 Zebra Danios?

Question

Two Zebra Danios have been pregant since I got them 1 year ago. Why wont they lay thier eggs??

Answer 1

They are egg scatterers and would be dead by now if they were egg bound. So I guess that your zebras are simply chubby...males do tend to be thinner...look at the anal fin...compare the stripping...males are horizontal, females are more diagonal. They can lay eggs about every 4 weeks....commercial breeders use a floating box with a screen bottom and they usually spawn in the morning....drifts of eggs fall through the screen...begin infusoria culture as soon as they spawn...eggs hatch in about 2 1/2 days under good temperatures.

Answer 2

They probably have been constantly laying eggs but you may not have noticed. Most people put marbles at the bottom of the tanks so the eggs can slip through and the fry have a chance. You really have to look hard to spot the fry. I would suggest daily siphoning of the marbles to remove the eggs into another tank and daily feeding of two drops of liquid fry food until you can actually see the fry.
A

Answer 3

It's possible they are laying their eggs, but that the eggs are getting eaten. Make sure you have some large substrate so the eggs can filter down to a safe place to mature. Marbles work well for this.
By the way... egg layers don't get "pregnant", that term is accurate only for live bearers. Egg layers get "ripe".