A R2R Spotlight "Tridacna Derasa"

Discussion in 'R2R Spotlight Series' started by skinz78, Jan 30, 2011.

  1. skinz78

    skinz78 Moderator Staff Member Team R2R R2R Supporter R2R Excellence Award

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    Genus = Tridacna
    Species = Derasa
    Common name= Derasa clam

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    Size and growth rate
    T. Derasa The Derasa Clam is also referred to as the Southern Giant Clam or Smooth Giant Clam. The latter name refers to the relative lack of scutes on the shell. The smoothness of its thick shell, and the 6-7 vertical folds helps to differentiate its species from T. gigas, its larger relative which is not as smooth and has 4-5 folds. In our aquariums, however, scutes may develop on the Deresa Clam due to the non hostile environment and the scutes not being broken off. This species is one of the largest of the "giant" clams, and grows rapidly, reaching a maximum size of approximately 18 inches. Under the proper conditions, smaller Derasa Clams can double or triple their size in less than a year. Those in the aquarium trade are usually cultured.


    Location and geographic range
    This gentle giant can be found living amongst corals and or on sand and rubble. The Derasa can be found living as deep as 15 meters. T Derasa can be found in the Indian Ocean, from Cocos-Keeling Island to the Central Pacific Ocean from Fiji, to Tonga. They are also found north to south from the China Sea, the Philippines down to the Great Barrier Reef and central Australia.

    Attachment to substrate
    As juveniles, T. Derasa uses their a byssal organ that secretes the sticky threads that will attach it to the substrate. This helps keep the clam from being swept away. In time this organ atrophies, the byssal opening grows shut with shell, and the large size of the animal helps keeps it in place.

    Lighting and flow requirements
    Derasa are one of the least light demanding of all the giant clams, even though they still require high end light. They will probably be ok with VHO or compact fluorescent lights but I recommend metal halide or T5 with individual reflectors. Giant clams are found on reefs that usually have SPS corals, flow should be moderate to high. Just be sure that the mantle isn't being held over un naturally because of too much flow.

    Coloration
    Derasa's mantle are a mixture of orange, yellow, blue, and black and white, and usually has a wavy striped or spotted pattern, usually with vivid blues and greens.


    Reef compatibility
    Giant clams are found among the reefs of the world and are compatible with most reef safe animals. Although there are some reef safe fish that are not clam safe. These include: Angelfish, some Wrasses, Blennie's, Eels, and some shrimp.

    Conclusion and comments.
    Derasa's are common to the aquarium industry. T. Derasa is a very hardy species and a good clam for the beginning hobbyist, provided reasonably strong lighting, clear water conditions and stable salinity is provided..

    It is my personal opinion that if you intend to keep a Tridacna Derasa you should have an aquarium of 75 gallons or larger. They can be kept in smaller tanks but they rapidly outgrow them.
     
  2. revhtree

    revhtree Owner Administrator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Partner Member

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    Bump for input and photos!
     
  3. skinz78

    skinz78 Moderator Staff Member Team R2R R2R Supporter R2R Excellence Award

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    My current T derasa.

    [​IMG]
     
  4. SeahorseKeeper

    SeahorseKeeper Where's the mysis? Staff Member Team R2R R2R Supporter R2R Excellence Award

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    Mine:

    [​IMG]
     
  5. ritter6788

    ritter6788 Coral Fraud Private Eye Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award

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    I got one a few years ago about 2 1/2 inches. It's pushing 7 now and grows fast if my water is right. If I don't see a thick line of new shell I know something is wrong with my water. I've never fed phyto or anything like that, even when small.

    Mid 2010 IIRC,
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    July 2012
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    I havn't taken a pic in a while but the same clam is in the bottom right of the tank,
    [​IMG]

    It's big enough now that when it closes up quickly you can hear it in the tank and all the fish scatter.
     
  6. JVI90gREEF

    JVI90gREEF Well-Known Member

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    I had never kept a clam before, but I decided to take the plunge about 5 months ago. Love this guy!

    ImageUploadedByTapatalk1383356859.515299.jpg
    ImageUploadedByTapatalk1383356901.831173.jpg
     
  7. SantaMonica

    SantaMonica Well-Known Member R2R Supporter Gold Sponsors

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    I think Deresa is my go-to clam for ease of care.
     

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