Corydoras eggs are uniquely sticky

Scientists have found that the eggs of the Bronze catfish, Corydoras aeneus, have a special adhesive surface not previously seen in other teleost fishes.

Huysentruyt and Adriaens, who have just reported their findings in the Journal of Fish Biology, examined the surface of Corydoras aeneus eggs using an electron microscope and found that they possess a unique structure among.

The surface of each egg is covered in tiny protruberances, similar to the attaching filaments which are more commonly seen on the eggs of other teleost fishes.

The study showed that Corydoras eggs are highly adhesive and Huysentruyt and Adriaens believe that this rare egg attachment mode could be an adaptation for life in the turbid waters in which the species is found.

For more details see the paper: Huysentruyt, F and D Adriaens (2005) - Adhesive structures in the eggs of Corydoras aeneus (Gill, 1858: Callichthyidae). Journal of Fish Biology, 66: 871-876.