1. Standard memberGrampy Bobby
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    20 May '16 04:51
    "How Do Starfish Mate?" by Madeline Masters

    "Starfish are resourceful creatures that can reproduce in more than one way. Starfish can either spawn together, or they can asexually reproduce- though this isn't the ideal way to produce new starfish because it doesn't promote genetic diversity within the species. While sexual reproduction is a naturally occurring process, asexual reproduction for starfish is usually only the result of dismemberment that results in the formation of two whole starfish with the same DNA." (to be continued) htp://animals.mom.me/starfish-mate-2055.html
    __________

    Thoughts?
  2. Standard memberGrampy Bobby
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    22 May '16 07:37
    "How Do Starfish Mate?"

    Spawning:
    Starfish reproduce sexually by spawning. Spawning means that the sex cells are released into the water. Starfish gather in groups to reproduce, which increases the likelihood the sperm and eggs will find each other. Starfish have sexual organs, or gonads, in each arm. During a breeding season the males' gonads fill with sperm and the females' gonads fill with eggs. When starfish spawn, the males release sperm and the females release eggs in great numbers. Female starfish may release millions of tiny eggs into the water during a spawning session.

    Egg Stage: When the eggs become fertilized they develop into zygotes. Some species of starfish brood their eggs after they're fertilized. They may sit over their eggs, or form a brooding basket in which the eggs are sheltered. The eggs may be held on the starfish's central disk or in sacs between the arms. Once the eggs hatch they are released into the open ocean to drift with the current and search for food.

    Larval Stage: In the larval stage the starfish is a miniscule, jelly-like blob that floats around feeding on microscopic flora and fauna. These larva are too small to be seen with the naked eye. The starfish larva metamorphosizes through several stages until it develops into a juvenile. The larva have bilateral symmetry, but in their adult form they'll have radial symmetry. Bilateral symmetry means the left and right halves resemble each other, where as in radially symmetrical animals the limbs radiate from a single point in the center of the body.

    Juvenile Stage: In the last stage of larval development the starfish abandons its free-floating planktonic lifestyle for a benthic (surface-dwelling) existence. The larva anchors itself to a surface and transforms into the juvenile stage. A juvenile starfish looks like a small version of an adult. Juvenile starfish spend most of their time in seclusion, hiding in crevices and under rocks to protect themselves from predators. After doing some growing they explore the ocean floors and reefs eating algae and other particulate matter. At about two years old the starfish is grown enough to be considered an adult starfish and can begin the reproductive stage of its life.

    Asexual Reproduction: If a starfish's arm is removed along with part of the central disk (the center of the body from which the arms radiate) a whole new sea star can form from that detached piece. The amputated starfish can also regenerate a new arm to replace the lost limb. Because two starfish have been formed from one, this is considered asexual reproduction. If you see a starfish that has some arms significantly longer than the rest, this is a sign the animal has regenerated some of its limbs." http://animals.mom.me/starfish-mate-2055.html
    _________________

    Your thoughts?
  3. Cape Town
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    22 May '16 11:462 edits
    Originally posted by Grampy Bobby
    Thoughts?
    It is not unusual for plants and single celled organisms to reproduce asexually, and is also surprisingly common amongst animals too. Certainly starfish are hardly unique in this regard.

    https://en.wikipedia.org/wiki/Asexual_reproduction#Examples_in_animals
    (twins are technically a form of asexual reproduction).
  4. Standard memberDeepThought
    Losing the Thread
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    23 May '16 13:29
    Originally posted by Grampy Bobby
    [b]"How Do Starfish Mate?" by Madeline Masters

    "Starfish are resourceful creatures that can reproduce in more than one way. Starfish can either spawn together, or they can asexually reproduce- though this isn't the ideal way to produce new starfish because it doesn't promote genetic diversity within the species. While sexual reproduction is a nat ...[text shortened]... me DNA." (to be continued) htp://animals.mom.me/starfish-mate-2055.html
    __________

    Thoughts?[/b]
    Getting their leg over is more complicated for starfish.
  5. Cape Town
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    23 May '16 13:42
    Originally posted by DeepThought
    Getting their leg over is more complicated for starfish.
    Getting their leg off works just as well.
  6. Subscribersonhouse
    Fast and Curious
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    23 May '16 21:47
    Originally posted by twhitehead
    Getting their leg off works just as well.
    So they get off by getting off..

    Well at least it simplifies organ donor transplants.....
  7. Standard memberGrampy Bobby
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    24 May '16 04:14
    Originally posted by twhitehead
    It is not unusual for plants and single celled organisms to reproduce asexually, and is also surprisingly common amongst animals too. Certainly starfish are hardly unique in this regard.

    https://en.wikipedia.org/wiki/Asexual_reproduction#Examples_in_animals
    (twins are technically a form of asexual reproduction).
    "Wikipedia does not have an article with this exact name. Please search for Asexual reproduction - Examples in animals in Wikipedia to check for alternative titles or spellings. Log in or create an account to start the Asexual reproduction - Examples in animals article, alternatively use the Article Wizard, or add a request for it.
    Search for "Asexual reproduction - Examples in animals" in existing articles.
    Look for pages within Wikipedia that link to this title."
    https://en.wikipedia.org/wiki/Asexual_reproduction#Examples_in_animals
    __________

    ?
  8. Cape Town
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    24 May '16 06:48
    Originally posted by Grampy Bobby
    ?
    You copy/pasted it wrong. Try again.
  9. Standard memberGrampy Bobby
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    25 May '16 08:53
    Originally posted by twhitehead
    You copy/pasted it wrong. Try again.
    What is the average life cycle of the Starfish?
  10. Joined
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    25 May '16 09:061 edit
    Originally posted by Grampy Bobby
    What is the average life cycle of the Starfish?
    Personally, not sure. But there are about 2000 species of starfish in existence and I presume how long a starfish takes to complete one life cycle depends on very much on the species of starfish.
    But I do know that most starfish in the oceans can potentially live for about 4 years although extremely few actually make it to 4 years old. So, logically, most must surely be able to complete their life cycle in much less than about ~4 years which helps to narrow down the answer to your question just a bit.
  11. Cape Town
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    25 May '16 12:05
    Originally posted by Grampy Bobby
    What is the average life cycle of the Starfish?
    As humy says, it depend on the species. It is highly likely that many starfish species exist that have never been catalogued or studied. The oceans remain largely unexplored.
    https://en.wikipedia.org/wiki/Starfish#Lifespan
  12. Standard memberGrampy Bobby
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    29 May '16 13:52
    Originally posted by humy
    Personally, not sure. But there are about 2000 species of starfish in existence and I presume how long a starfish takes to complete one life cycle depends on very much on the species of starfish.
    But I do know that most starfish in the oceans can potentially live for about 4 years although extremely few actually make it to 4 years old. So, logically, most must su ...[text shortened]... in much less than about ~4 years which helps to narrow down the answer to your question just a bit.
    Originally posted by humy
    "Personally, not sure. But there are about 2000 species of starfish in existence and I presume how long a starfish takes to complete one life cycle depends on very much on the species of starfish."
    _________________

    humy, what species in the pyramidal food chain is the most likely natural enemy of the Starfish?
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