Thai Culture, Siamese fighting fish

Reproduction and nests

The Siamese fighting fish mate in a fashion that is called "nupital embrace", in which the male and female spiral around each other, around 10-41 eggs are released and fertilized at each embrace, until the female is exhausted of eggs. The male carefully keeps every egg in his bubble nest, making sure none fall to the ground, and repairing the bubble nest as needed. Incubation last 30-40 hours, and the eggs hatch in 3-4 days.

Betta males build bubble nests of various sizes and thicknesses at the surface of the water. During and after spawning, the male uses his mouth to retrieve sinking eggs and deposit them in the bubble nest. After approximately two days the eggs hatch, and after three more they become free-swimming fry; at this point the male is generally removed from the breeding tank to prevent eating the young. Betta fry are fed infusoria for the first several days, followed by newly hatched brine shrimp or similarly sized food.

B. splendens can be hybridized with B. imbellis, Betta sp. Mahachai and B. smaragdina, though with the latter the fry tend to have low survival rates.

by: http://en.wikipedia.org