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Foam fractionation is a chemical process in which hydrophobic molecules are preferentially separated from a liquid solution using rising columns of foam. It is commonly used, albeit on a small scale, for the removal of organic waste from aquariums ; these units are known as " protein skimmers ".
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. Fish that build and guard bubble nests are known as aphrophils . [ 1 ]
They are sought after due to their bright colours and relative intelligence, being able to recognise their owners and "greeting" them, [6] having a desire to explore the plants and rocks placed across their aquarium, [7] and displaying extensive paternal care with the males protecting the eggs until they hatch, and building a foam raft to keep ...
Corydoradines breed over the substrate (such as rocks, logs, or leaves) as most catfish. However, the members of the subfamily Callichthyinae are known for building and guarding floating foam bubble nests; Hoplosternum littorale is reported to have the most complex nest structure. [17] These floating nests are made of foam and plant debris.
The male produces most of the foam. First, the male and female come to the surface and swim belly-up in small circles. The film of the air-water interface is swallowed and pumped out through the gills, where it gains mucus. Movement of the pelvic fins stirs the water and mucus, captures air bubbles, and breaks these air bubbles into a foam. [6]
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