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Aquarium surprised by ‘virgin birth’ of swell shark in all-female tank | Sharks
Birds do it, bees do it. Even educated fleas do it, according to Cole Porter’s classic song on the universal nature of sex.
But a baby swell shark born in a Louisiana aquarium that houses only females has flummoxed marine experts and raised the possibility that the species may not require such earthly pleasures to produce offspring.
Yoko, the swell shark pup, hatched on 3 January after an egg was spotted by the US aquarium’s animal husbandry team eight months ago. The egg could have gone undetected for up to two months prior to that, according to the Shreveport aquarium.
The two female sharks present in the tank had not been in contact with a male for more than three years, the team says. This suggests either a process called parthenogenesis, a rare form of asexual reproduction, or delayed fertilisation may have occurred.
A DNA analysis once the pup is big enough for a blood sample to be taken will determine the truth about the mysterious birth, but will take months.
“This situation is incredible and shows the resilience of this species,” said Greg Barrick, the curator of live animals at Shreveport aquarium. “We are very excited in the coming months to confirm whether this was indeed a case of parthenogenesis or if it was delayed fertilisation.”
The baby shark – named after the Native American Chumash people’s word for shark, “onyoko” – was said to be thriving, although the aquarium acknowledged that sharks born though such reproductive events often face significant challenges. Should Yoko’s time with us be short, they said, she will leave an “unforgettable legacy” to the study of shark reproduction and conservation.
If Yoko was indeed born via parthenogenesis, she would join animals such as starfish, deep sea worms and insects capable of such “virgin births”. Laying eggs without mating is much rarer in vertebrates, but it has been seen in zebra sharks, sawfish and a handful of reptiles. The phenomenon was first documented in Komodo dragons, the world’s largest reptiles, in 2006, after occurring in two British zoos. Last year, a stingray called Charlotte in an aquarium in North Carolina was found to be pregnant despite not having been in contact with a male for eight years.
While scientists assume vertebrates turn to parthenogenesis when no mates are present, many aspects remain unknown, including why it occurs and what triggers it.
Colin Stevenson, head of education at Crocodiles of the World in Brize Norton, England, a zoo which boasts a male Komodo dragon born by parthenogenesis to a female in Prague, said: “Komodos are famous for it. They can reproduce normally but every now and again, they pop out a parthenogenetic one. The trick is to work out what kicks it off.”
Aquarium staff were left stunned when a female swell shark in an all-female tank gave birth to a pup without any male involvement. The phenomenon, known as parthenogenesis, is extremely rare in sharks and has only been observed a handful of times in captivity.The unexpected birth took place at the Belle Isle Aquarium in Detroit, Michigan, where a team of researchers and marine biologists have been studying the behavior of the female sharks. The mother shark, named Luna, had been in the tank for several years and had never been in contact with a male shark.
The baby shark, a healthy female pup, has been named Starlight by the aquarium staff. The team is now closely monitoring the pup’s development to see if she exhibits any unusual traits or behaviors.
Parthenogenesis is a fascinating phenomenon that occurs in some species of sharks, where a female is able to reproduce without mating with a male. This incredible event has left the aquarium staff amazed and excited to learn more about the reproductive capabilities of these fascinating creatures.
The news of Starlight’s birth has sparked interest and curiosity among marine biologists and shark enthusiasts around the world. The aquarium plans to continue studying the all-female tank and the behavior of the sharks to gain further insights into this rare occurrence.
This unexpected ‘virgin birth’ of a swell shark has truly taken everyone by surprise and serves as a reminder of the wonders of the natural world. The aquarium staff are thrilled to witness this rare event and look forward to sharing more updates on Starlight’s growth and development.
Tags:
- Aquarium
- Virgin birth
- Swell shark
- All-female tank
- Marine life
- Shark reproduction
- Shark behavior
- Shark conservation
- Aquatic news
- Marine biology
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Spectrum Organic Extra Virgin Mediterranean Olive Oil (Unrefined / 33.8 oz.)
Spectrum Organic Extra Virgin Mediterranean Olive Oil (Unrefined / 33.8 oz.)
Price : 35.00
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Bono Organic Sicilian Extra Virgin Olive Oil (Val di Mazara PDO / 16.9 oz.)
Price : 16.00
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Price: $15.45
(as of Jan 24,2025 03:53:22 UTC – Details)
Consult a healthcare professional before use, especially for people with sensitive skin or medical conditions.
Is Discontinued By Manufacturer : No
Product Dimensions : 3.5 x 3.5 x 3.5 inches; 1.2 Pounds
Item model number : No Model
UPC : 767674344938 850605005258
Manufacturer : The Roots Naturelle
ASIN : B00MEWVZ6URESTORES DRY AND DAMAGED HAIR – Ideal for African American hair types. Deep Conditioner for hair that may have suffered from years of plaiting, heat or chemical treatments.
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