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Bubble nests, also called foam nests, are created by some fish and frog species as floating masses of bubbles blown with an oral secretion, saliva bubbles, and occasionally aquatic plants, or an area for egg deposit attached at the bottom. Fish that build and guard bubble nests are known as aphrophils. Aphrophils include gouramis (including ''Betta'' species) and the synbranchid eel ''Monopterus alba'' in Asia, ''Ctenopoma'' (Anabantidae), ''Polycentropsis'' (Nandidae), and ''Hepsetus odoe'' (the only member of Hepsetidae) in Africa, and callichthyines and the electric eel in South America.〔 Most, if not all, fish that construct floating bubble nests live in tropical, oxygen-depleted standing waters.〔 Anabantidae are the most commonly recognized family of bubblenest makers. The nests are constructed as a place for fertilized eggs to be deposited while incubating and guarded by the male until the fry hatch. ==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 stimuli have been shown to onset the construction of Bubble Nests, such as rapid changes in temperature, barometric changes, fluctuations in rainfall, various fish tank materials, 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 Siamese fighting fish (''Betta splendens'') are made from air bubbles coated with saliva to increase durability. The creation of the bubbles is audible and often frantic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bubble nest」の詳細全文を読む スポンサード リンク
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