Can betta fish spawn but no eggs come out?

It's possible for a betta fish pair to go through the motions of spawning without producing eggs. There are a few reasons why this might happen:

* Not truly ready: Even if a pair is displaying spawning behavior, one or both fish might not be physiologically ready. This could be due to age, stress, or inadequate environmental conditions.

* Unhealthy fish: If the female is unhealthy, she may not be able to produce viable eggs. Similarly, the male might have issues producing sperm.

* Poor water quality: Unstable water parameters like ammonia, nitrite, or nitrates can negatively impact spawning.

* Lack of conditioning: Betta fish need to be properly conditioned before breeding. This includes feeding them a high-protein diet and offering them suitable spawning temperatures.

* Male is not aggressive enough: The male betta plays a crucial role in encouraging the female to release eggs. He needs to be appropriately aggressive to make her feel secure enough to spawn.

* No suitable spawning site: The female might not feel comfortable releasing eggs if she doesn't have a suitable spawning nest or area.

If you're trying to breed bettas, it's essential to:

* Ensure your fish are healthy.

* Condition them properly.

* Provide a stable, high-quality environment.

* Pay attention to their behavior.

* Provide a suitable spawning site.

It's important to note that even when everything is ideal, bettas don't always spawn. Breeding is a natural process, and sometimes, it just doesn't happen.