The two most common fish in this group are the kissing gourami and the Siamese fighting fish (betas).

The two most common fish in this group are the kissing gourami and the Siamese fighting fish (betas).

• A. Egg-layers
• B. Egg-scatterers
• C. Livebearers
• D. Bubble-nest builders

Answer: (D)

Bubble-nest builders describe this group because these fish reproduce by creating a floating nest of bubbles at the water surface. The kissing gourami and the Siamese fighting fish are classic examples of this behavior. After the female lays eggs, the male forms and guards a nest of bubbles (often coated with mucous) where the eggs are kept and fertilized. This spawning method is more specific than simply labeling them as egg-layers, as it highlights the distinctive nest-building and parental care at the surface. Egg-scatterers release eggs into the water without a nest, and livebearers give birth to live young, which is why those options don’t fit as well.

Bubble-nest builders describe this group because these fish reproduce by creating a floating nest of bubbles at the water surface. The kissing gourami and the Siamese fighting fish are classic examples of this behavior. After the female lays eggs, the male forms and guards a nest of bubbles (often coated with mucous) where the eggs are kept and fertilized. This spawning method is more specific than simply labeling them as egg-layers, as it highlights the distinctive nest-building and parental care at the surface. Egg-scatterers release eggs into the water without a nest, and livebearers give birth to live young, which is why those options don’t fit as well.