Construction
Bubble nests are built even when not in presence of female or fry (though often a female swimming past will trigger the frantic construction of the nest). Males will build bubble nests of various sizes and thicknesses, depending on the male's territory and personality. Some males build constantly, some occasionally, some when introduced to a female and some do not even begin until after spawning. Some nests will be large, some small, some thick.
Various things have been shown to stimulate bubble nest construction, such as quick temperature changes, barometric changes, fluctuations in rainfall, materials in the tank, and presence of other males or females.
The nests are built by the male (sometimes females) and their size, position and shape depends on the species. They are often built near an object that breaks the surface of the water, which forms a base for the nest.
Bubble nests created by male betta/Siamese Fighting Fish (Betta splendens) are made from air bubbles coated with saliva to increase durability. This makes a louder noise than regular breathing and is often frantic behavior.
Read more about this topic: Bubble Nest
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