The eggs of some fish can also survive in air, as long as the air is well laden with
humidity. The splash tetra Copella arnoldi – itself an air-breather – can jump straight
out of the water and deposit eggs or sperm on the underside of leaves. Then from
below the males splash water onto the eggs every 10-15 minutes to keep them moist
and oxygenated. In an aquarium, splash tetras can lay eggs on glass above the
waterline, or even on the underside of the tank lid.