How will the arowana fish hatch eggs?

Arowana fish do not hatch eggs. They are paternal mouthbrooders, meaning the male fish holds the fertilized eggs in his mouth until they hatch. The eggs are released into the water by the female and are then immediately picked up by the male. He will carry the eggs in his mouth for a period of 1.5 to 2.5 months, depending on the species. During this time, he will not eat and will fan water over them to keep them oxygenated. Once the eggs hatch, the male will continue to carry the fry in his mouth for a few days until they are free swimming.