For the majority of organisms, sex is not something that can be changed. This is not true, however, for a fish called the bluehead wrasse. These fish can go from female to male, complete with ...

Reproduction in the animal world does not always follow a fixed script. In several species, individuals shift their ...

For most animals, the sex is established early on in development, and stays that way throughout the life of the organism. But around 500 different types of fish are able to switch sex when they’re ...

If in the beginning there was male and female, fish seem to have forgotten the memo. For nearly 500 fish species, including the clownfish in “Finding Nemo,” the great divide between sexes is more like ...

(CN) – Hundreds of species of fish are able to completely reverse their sex several times during their lives, and researchers in New Zealand said in a study published Wednesday they have finally ...

The bluehead wrasse is a fish that lives in small social groups in coral reefs in the Caribbean. Only the male has a blue head – signalling his social dominance over a harem of yellow-striped females.

Sex change in the bluehead wrasse: Loss of a dominant male signals sex change in a female. The dramatic changes in coloration, behavior and gonadal anatomy are orchestrated by changes in gene ...

A female becomes a male: a transitioning bluehead wrasse (darker coloration) establishes dominance and begins courting females (yellow coloration). A University of Otago-led study is heralding ...

For a tropical fish called the bluehead wrasse, sex isn’t always permanent. When a group of the fish loses its dominant male, the biggest female rapidly changes sex, taking on distinctive male ...