Some fish are born in nests.

Members of the Labyrinth fish family build nests for their young ones.

The air breathing fighting fish builds its nest from mucus coated air bubbles.

The bubbles are blown by the male and used to form a raft.

The eggs are laid in water.

The adults catch the eggs and spit them into the underside of the raft.

After the eggs hatch, the young ones stay on the raft

for some time under the protective eyes of the father.

The three-spined sickleback is another nest builder.

The male collects the pieces of the aquatic plants

and cements them together by a secretion from its kidney.