Biologists studying a small, colorful fish in the Mediterranean Sea have discovered a new way in which a female can choose the best father for her offspring. During spawning of the ocellated wrasse, ...

For many fish species today, copulation is a hands-off affair. Females release a torrent of eggs into the water, and males douse the eggs in a cloud of sperm. This seems like a pretty basic way of ...

The discovery of embryos in certain fossil fishes not only shows that internal fertilization and live birth evolved early in vertebrate history, but also raises questions about the origin of jawed ...

The history of sex may have to be rewritten thanks to a group of unsightly, long-extinct fish called placoderms. A careful study of fossils of these armour-plated creatures, which gave rise to all ...

Biologists studying a small, colorful fish in the Mediterranean Sea have discovered a new way in which a female can choose the best father for her offspring. The animal kingdom is full of elaborate ...