Derasa Clam - Tridacna derasa - Small (ORA)
Ocean, Reefs & Aquariums
Item # 216797 / Manufacturer Part #
Clams are wonderful additions to any reef aquaria but do have some requirements that make them more difficult than other inverts to keep. Some research is recommended before purchasing one to find out what species will work the best in your reef aquarium.
Derasa Clams (Tridacna derasa) can grow quite large in the home aquarium. They are typically found with yellow to gold striped mantle colorations outlined in blue or purple. Mantle patterns and colors will vary between individual specimens. Unlike most other species of clams, the Derasa Clam has a mostly smooth shell without prominent scutes. They generally have six or seven vertical folds but can have up to twelve. The shell itself is whitish and fan-shaped when small, becoming slightly more elongated as the clam grows. These clams are usually fairly thin at the top when closed and only slightly inflated towards the bottom.
Derasa's are found on a variety of surfaces. They can grow within colonies of corals (especially Acropora corals) or on sandy flats, rubble piles or rock faces. They are usually found in fairly shallow waters but some have been found much deeper in areas with very clear water.
The "byssal opening" where the foot and byssal threads are extended from on the bottom of the clam is very small on Derasa Clams. Young clams are only lightly attached and this attachment is lost as the clam grows. Some Derasa Clams have even been found with no byssal opening at all. The opening is more slot-like in shape rather than the elliptical or circular opening found on other clams. The top edge of this clam is symmetrical and the clam can close up very tightly.
Derasa's are one of the hardiest Tridacna species. They require strong lighting and ideal water quality and should be placed under high direct light (Metal Halide, VHO, or Power Compact). Smaller clams rely heavily on planktonic foods filtered from the water for their nutrition. They should be fed regularly with various types of planktonic foods like phytoplankton, zooplankton, oyster eggs, rotifers and similar items. Avoid keeping with potential predators or tankmates that may nip at the clam's mantle like some wrasses, angelfish, crabs, and others.
For more information on these and other clams, visit the Giant Clams Species Profile on That Fish Blog by our staff marine biologists.
The clam pictured above is representative only - the coloration of the clam you receive may vary. Please contact the Livestock department for information on availability of specific colorations.
ORA clams are propagated by Oceans, Reefs & Aquariums, the largest marine ornamental fish hatchery in the world. They continuously develop new frags, inverts and fish and many are available in very limited quantities. We are proud to offer ORA's clams as part of our collection.
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Most of our live items are covered by our 14-day Arrive Alive Guarantee. Restricted Items are not covered by this policy for any reason. View the full Livestock Guarantee Policy and Restricted Species list for full details. Any losses must be reported to us within the 14-day guarantee period and we do require verification for any losses.Shipping charges are not covered by our livestock guarantee policy and are non-refundable.
Q: How much does it cost to have live plants and animals shipped to me?
Q: When will my Livestock order ship?
Live orders (fish, invertebrates) are shipped FedEx Standard Overnight or FedEx Priority Overnight Monday through Thursday for delivery Tuesday through Friday. Live plants and live rock orders are shipped via FedEx 2-day express Monday through Wednesday for delivery Wednesday through Friday. Shipping upgrades to overnight shipping are available for an additional fee.Orders placed before noon (Eastern) are generally shipped the same day. Orders placed after noon are shipped the next shipping day.PayPal Orders Only: We cannot hold or modify orders placed with PayPal. PayPal's policies do not allow us to hold orders for more than three days after they are placed. Depending on when the order was placed, this may mean that the payment authorization is expired before the order is scheduled to be shipped. In this instance, a livestock department representative will contact you regarding the options for your order.
Live Fish/Invert Charges: Q: How do you ship live plants and animals?
*Standard Overnight: $34.99Priority Overnight: $44.99Live Aquarium Plant Shipping Charges:
FedEx 2-day Plant Shipping: $13.99 (default ship method)*Standard Overnight Plant Shipping: $29.99Priority Overnight Plant Shipping: $39.99Live Rock Shipping Charges:
Packages are shipped free via FedEx 2-day Express. You may upgrade the shipping method to Standard Overnight or Priority overnight for an additional charge.Please contact a livestock representative for upgraded shipping quotes at 1-877-367-4377.
*Standard Overnight where available only, priority rate may apply. Shipping charges are not covered by our livestock guarantee policy and are non-refundable.
Livestock orders are packed and shipped in a separate facility from dry goods and cannot be shipped with dry goods.We make every effort to make transit comfortable and safe for livestock. We review the temperature and destination for every order, and pack the livestock accordingly. Fish and invertebrates are triple-bagged and packed with heat packs or ice packs (as needed) in insulated styrofoam containers and cardboard shipping boxes. Plants are carefully wrapped in wet paper and plastic then shipped in standard FedEx shipping boxes (with heat packs or ice packs as needed).Q: Where does That Fish Place - That Pet Place ship Livestock?
*Heat packs are usually taped to the lid or side of the box. These packets should be discarded after delivery; do not add these packets or their contents to your aquarium. We always attach a copy of your invoice/packing list and our Guarantee Policy inside the box.
Livestock shipping is available only within the contiguous 48 states (except California). We cannot ship livestock internationally (including Puerto Rico) or to Alaska, Hawaii or California.View our complete list of aquatic plant shipping restrictions. We are unable to ship livestock to APO or PO addresses.Q: Can I specify size, color or sex?
Sizes of livestock items offered can vary by supplier, collection area, and time of year. We do not assign specific measurements to live items, but rather general sizes (small, medium, large, XL). If the actual size of a fish or invertebrate you are considering is a concern, please speak directly to a livestock representative to discuss the items you're considering. We do not sell any fish by sex other than those specifically listed as "male" or "female". We cannot guarantee that the fish can be successfully sexed or that the ratio of male/female you request will be available.Please be aware that coloration within species may be quite variable. The specimen you recieve may not look exactly like the representative photo on the site do to these natural variations in color or markings. If you have a request for a specific color in any of our assorted items, you contact the Livestock Mailorder department at 877-367-4377 or firstname.lastname@example.org. We try to fill special requests when possible, but cannot guarantee the preference.