Scientists have discovered a fish carrying genes only from its father in the nucleus of its cells. Found in a type of fish called Squalius alburnoides, which normally inhabits rivers in Portugal or Spain, this is the first documented instance in vertebrates of a father producing a near clone of itself through sexual reproduction — a rare phenomenon called androgenesis, the researchers reported in the journal Royal Society Open Science. The possibility of androgenesis is just one of many mysteries about Squalius alburnoides. It’s not a species in the usual sense but rather something called a hybrid complex, a group of organisms with multiple parental combinations that can mate with one another.

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