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<blockquote data-quote="Aeolius" data-source="post: 380371" data-attributes="member: 2072"><p>Some interesting shark-related news: Shark Gives “Virgin Birth”</p><p></p><p>from: <a href="http://www.detroitzoo.org/media/release_pages.asp?ID=250" target="_blank">http://www.detroitzoo.org/media/release_pages.asp?ID=250</a></p><p></p><p>“ September 19, 2002, Detroit, MI – Some may call it extraordinary, others may call it a miracle, but the Belle Isle Aquarium calls its two new white spotted bamboo sharks special. The shark births aroused curiosity due to the fact that the mother is housed with only one other adult bamboo shark, which is also a female! The mother laid its eggs almost fifteen weeks prior to the incredible hatching in July. The young sharks are doing well and can now be seen on exhibit daily at the Belle Isle Aquarium. </p><p></p><p>The female bamboo sharks have laid eggs in the past. This is not unexpected, as many animals will lay infertile eggs even if there is not a male to mate with. Normally the eggs are assumed to be inviable and are discarded. However, this is the first time in the Belle Isle Aquarium’s history that this has happened and only the second time such a phenomenon has occurred at an accredited zoo or aquarium. </p><p></p><p>Late last year, a similar event at the Henry Doorly Zoo in Omaha, NE, occurred in which a bonnethead shark gave birth to a baby shark with no male presence. This was the first reported instance which raised suspicions that sharks may be able to reproduce parthenogenetically, that is by virgin birth (the animal has the ability to develop a new egg without fertilization). </p><p></p><p>Doug Sweet, Curator of Fishes at the Belle Isle Aquarium states, "We are very excited about these births and eager to learn why this happened. We hope our research will provide new information on the white spotted bamboo shark’s reproduction process ." </p><p></p><p>Genetic testing will soon begin on the newly hatched sharks to demonstrate whether or not they are indeed true parthenogenetic sharks, or if another explanation is available. For example, the tests may reveal that the mother could actually be both male and female, thus capable of fertilizing its own eggs. This occurrence is common in invertebrates, such as snails, and some lower vertebrates, such as the mangrove killifish and the goby fish. Another possible explanation could be that the shark was fertilized by a male at a young age. </p><p></p><p>White spotted bamboo sharks live in crevices among coral reefs in the south Pacific Ocean. Normally nocturnal, bamboo sharks hide during the day and come out at night to search the reef for small fish, crabs, squid, and octopus to feed on. The shark can live up to 25 years in captivity. </p><p></p><p>Though they are true sharks, bamboo sharks are not shaped like the more familiar "requiem" sharks, such as the great white, hammerhead, and tiger sharks. Their average size falls in a range between two to three feet, and their narrow body and flattened heads are adapted to wiggling under and into coral heads and crevices to catch their prey. “</p></blockquote><p></p>
[QUOTE="Aeolius, post: 380371, member: 2072"] Some interesting shark-related news: Shark Gives “Virgin Birth” from: [url]http://www.detroitzoo.org/media/release_pages.asp?ID=250[/url] “ September 19, 2002, Detroit, MI – Some may call it extraordinary, others may call it a miracle, but the Belle Isle Aquarium calls its two new white spotted bamboo sharks special. The shark births aroused curiosity due to the fact that the mother is housed with only one other adult bamboo shark, which is also a female! The mother laid its eggs almost fifteen weeks prior to the incredible hatching in July. The young sharks are doing well and can now be seen on exhibit daily at the Belle Isle Aquarium. The female bamboo sharks have laid eggs in the past. This is not unexpected, as many animals will lay infertile eggs even if there is not a male to mate with. Normally the eggs are assumed to be inviable and are discarded. However, this is the first time in the Belle Isle Aquarium’s history that this has happened and only the second time such a phenomenon has occurred at an accredited zoo or aquarium. Late last year, a similar event at the Henry Doorly Zoo in Omaha, NE, occurred in which a bonnethead shark gave birth to a baby shark with no male presence. This was the first reported instance which raised suspicions that sharks may be able to reproduce parthenogenetically, that is by virgin birth (the animal has the ability to develop a new egg without fertilization). Doug Sweet, Curator of Fishes at the Belle Isle Aquarium states, "We are very excited about these births and eager to learn why this happened. We hope our research will provide new information on the white spotted bamboo shark’s reproduction process ." Genetic testing will soon begin on the newly hatched sharks to demonstrate whether or not they are indeed true parthenogenetic sharks, or if another explanation is available. For example, the tests may reveal that the mother could actually be both male and female, thus capable of fertilizing its own eggs. This occurrence is common in invertebrates, such as snails, and some lower vertebrates, such as the mangrove killifish and the goby fish. Another possible explanation could be that the shark was fertilized by a male at a young age. White spotted bamboo sharks live in crevices among coral reefs in the south Pacific Ocean. Normally nocturnal, bamboo sharks hide during the day and come out at night to search the reef for small fish, crabs, squid, and octopus to feed on. The shark can live up to 25 years in captivity. Though they are true sharks, bamboo sharks are not shaped like the more familiar "requiem" sharks, such as the great white, hammerhead, and tiger sharks. Their average size falls in a range between two to three feet, and their narrow body and flattened heads are adapted to wiggling under and into coral heads and crevices to catch their prey. “ [/QUOTE]
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