Fish That Defied Evolution: All Female Species Survives 100,000 Years Without Males
A small fish living in the rivers of Mexico and southern Texas is challenging one of biology oldest assumptions about survival and evolution. Known as the Amazon molly, this remarkable species has existed for around 100,000 years without producing male offspring, leaving scientists fascinated by how it has managed to avoid extinction.
The Amazon molly is an all female fish species that reproduces through a rare process called gynogenesis. Females require sperm from closely related male fish to trigger reproduction but the male DNA is not passed on to the offspring. Instead, the young are essentially clones of their mothers, creating generation after generation of female fish.
For decades, scientists believed such species should not survive for long. Traditional evolutionary theory su...









