What are the signs that a female betta fish is pregnant?

1. Increased belly size: As the eggs develop, the female betta's belly will become noticeably swollen and round.

2. Dark vertical stripes: Pregnant female bettas often develop dark vertical stripes on their bodies. These stripes are called "breeding bars" and are a sign that the female is ready to mate.

3. White spot on belly: A small white spot may appear on the female's belly, just below the anal fin. This spot is called the "egg spot" and is where the eggs will be released during spawning.

4. Hiding behavior: Pregnant female bettas may become more shy and reclusive as they prepare to lay their eggs. They may hide in plants, behind decorations, or in corners of the tank.

5. Nest building: Male bettas build bubble nests at the surface of the water, but females may help to build the nest or add their own bubbles to it.

6. Aggression: Pregnant female bettas may become more aggressive towards other fish in the tank, including male bettas. This is because they are protecting their eggs and fry.

7. Loss of appetite: Pregnant female bettas may eat less than usual as they focus on preparing for spawning.

If you notice any of these signs in your female betta fish, it is likely that she is pregnant and will soon lay eggs. Be prepared to provide her with a suitable spawning tank and plenty of hiding places for her fry.