GloFish are genetically modified zebrafish, and their reproductive processes differ from guppies. They don't have a specific "gravid spot" to indicate pregnancy.
Here's how you can tell if a female GloFish is pregnant:
* Larger belly: A pregnant GloFish will have a noticeably rounder belly than a non-pregnant one.
* Increased appetite: Pregnant females will eat more.
* Egg-laying behavior: Just before giving birth, you may observe the female spending more time near the bottom of the tank and twitching her tail.
If you're unsure about whether your GloFish is pregnant, it's best to observe her closely for any changes in her behavior or appearance.