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Fish Sex Can Get Very, Very Weird


The Surprise Hiding in the DNA of Pet Fish
Sarah Zhang
© anisah priyadi / getty
In 1975, scientists tried spaying a few hundred female betta fish. We all know what happens to spayed cats and dogs: They become sterile. Betta fish are different. A third of the surviving bettas regenerated an ovary which, okay, interesting enough. But the remaining two-thirds did something much, much stranger: They grew testes. They turned brighter and darker in color too like male bettas. They grew elongated fins like males. They even started making sperm like males, obviously. When mated with other female betta fish, these females-turned-males produced offspring that looked perfectly healthy. The only notable oddity was that the resulting broods were usually, but not always, exclusively female. ....

Hannes Svardal , Rasmus Nielsen , David Conover , Thomas Kocher , Manfred Schartl , International Betta Congress , Stony Brook University , Nanchang University , University Of Antwerp , Columbia University Zuckerman Institute , University Of Maryland At College Park , College Park , Southeast Asia , Columbia University , Zuckerman Institute , Westminster Dog Show , Stony Brook , Gene Lucas , ரஸ்முச் நீல்சன் , டேவிட் கோணோவேர் , ஸ்டோனி சிற்றாறு பல்கலைக்கழகம் , நங்சங் பல்கலைக்கழகம் , பல்கலைக்கழகம் ஆஃப் ஆண்ட்வெர்ப் , கொலம்பியா பல்கலைக்கழகம் ஸக்மந் நிறுவனம் , பல்கலைக்கழகம் ஆஃப் மேரிலாந்து இல் கல்லூரி பூங்கா , கல்லூரி பூங்கா ,

How Do Fish Become Male or Female? - The Atlantic


The Atlantic
Domesticated betta fish have evolved a sex gene not found in wild fish of their species.
anisah priyadi / getty
In 1975, scientists tried spaying a few hundred female betta fish. We all know what happens to spayed cats and dogs: They become sterile. Betta fish are different. A third of the surviving bettas regenerated an ovary which, okay, interesting enough. But the remaining two-thirds did something much, much stranger: They grew testes. They turned brighter and darker in color too like male bettas. They grew elongated fins like males. They even started making sperm like males, obviously. When mated with other female betta fish, these females-turned-males produced offspring that looked perfectly healthy. The only notable oddity was that the resulting broods were usually, but not always, exclusively female. ....

David Conover , Stony Brook University , Westminster Dog Show , Stony Brook , டேவிட் கோணோவேர் , ஸ்டோனி சிற்றாறு பல்கலைக்கழகம் , வெஸ்ட்மின்ஸ்டர் நாய் காட்டு , ஸ்டோனி சிற்றாறு ,