View Cart You may change your account settings, including your Billing & Shipping Addresses, Credit Card Information, as well as Express Checkout status.
  Welcome to!  
Saltwater Invertebrates Saltwater Invertebrates

Diver's Den - WYSIWYG Fish, Corals, Inverts & More
Weekly Specials
Aquarium Supplies

Marine Invertebrate
Fan Worms
Sea Slugs
Sea Stars
Tridacna Clams
Freshwater Fish Pond Fish Pond Plants Foods/Marine Plants Freshwater Inverts Freshwater Plants
Marine Fish Corals Live Rock Reef Cleaner Packs Marine Inverts ORA Fish/Coral/Inv
Home > Marine Invertebrates > Aquacultured Invertebrates > Derasa Clam, Tiger Striped, Aquacultured
Derasa Clam, Tiger Striped, Aquacultured (Tridacna derasa)
View larger image
Due to variations within species, your item may not look identical to the image provided.
Care Level: Moderate
Reef Compatible: Yes
Lighting: Moderate
Waterflow: Medium
Placement: Bottom to Middle
Water Conditions: 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025
Color Form: Blue, Brown, Tan, White
Diet: Filter Feeder, Plankton Eater
Supplements: Calcium, Trace Elements
Compatibility: View Chart
Origin: Micronesia
Family: Tridacnidae

What do these Quick Stats mean? Click here

Tridacna derasa is also referred to as the Southern Giant Clam or Smooth Giant Clam, and is the second largest of all the Tridacna spp., reaching a size of 24" in the wild. Unlike most other Tridacna spp. that have a large byssal opening, Derasa Clams have a narrow gap on the underside of their thick, smooth shell. They can easily be confused with their close relative Tridacna gigas, especially when they are very small in size. T. derasa can be identified by having six to seven vertical folds in their shell which they can close completely, where T. gigas has only four or five vertical folds, and is unable to completely close their hinged shell.

Tridacna derasa have a broad range in the wild and are found in the Indo-Pacific, Central Pacific and South Pacific as well as the Coral Sea. They occupy outer reef habitats on both sandy and hard packed substrates, and can be found either solitary or in small aggregations at depths ranging from 10 to 60 feet. All Derasa Clams entering the aquarium trade are cultured in the Central Pacific and South Pacific Ocean. Although they can be found in a variety of colorations and patterns in the wild, the ones aquacultured for the aquarium trade are primarily gold, brown, orange, and yellow, with vibrant blue or green trim edging that surrounds the mantle.

T. derasa will arrive unattached to any rock or substrate, and prefer to be placed in the sand or in a recess of a rock, as they do not attach as firmly to the substrate or rockwork like most other members of the genus. In the home aquarium, Derasa Clams require moderate to intense lighting to thrive as they contain the symbiotic algae called zooxanthellae, and receive the majority of their nutrition from the light through photosynthesis. Smaller T. derasa that are 2" or less in size are much more sensitive to very intense lighting as their membrane is much thinner than larger specimens.

For this reason care should be taken to properly photo-adapt them to the existing reef aquarium lighting in a similar manner to newly introduced stony and soft corals. When adapting a new Derasa Clam to very intense lighting, it is ideal to set them on a small rock or in a plastic dish with coarse substrate at the bottom of the aquarium. Over time, the clam can then be slowly moved up higher in the aquarium. When maintained in the proper environment, smaller Derasa Clams can double or triple their size in less than a year.

Tridacna clams are also filter feeders and constantly filter the water for small particulates. Derasa Clams larger than 2" do not require supplemental feedings, but smaller T. derasa that are less than 2" should be fed a phytoplankton or greenwater supplement several times per week if maintained in a nutrient poor reef aquarium.

Looking for the best food to feed your Tridacna Clams? We recommend AlgaGen Acartia tonsa, AlgaGen Pseudodiaptomus pelagicus, AlgaGen Parvocalanus crassirostris, AlgaGen Tangerine Pod, AlgaGen Moina salina, AlgaGen PhycoPure™ Reef Blend, AlgaGen Decap'd Brine™, and AlgaGen Rotifers.

Tridacna derasa are the hardiest and most adaptable of all the Tridacna spp., and require moderate to intense lighting and good water flow in the home aquarium. Proper water chemistry is very important, and they will thrive when calcium levels of 380- 450 mg/L, alkalinity level of 8-11 dKH, and magnesium level of 1280-1350 ppm are maintained.

Bookmark and Share
  Set up an Email Alert for
  Out-Of-Stock or Seasonal Items!

*Prices subject to change on out of stock items
  SW - Derasa Clam, Tiger Striped 1-1/4 to 1-3/4 inch (Micronesia) - Aquacultured
  CN-37496,  $ 59.99
  SW - Derasa Clam, Tiger Striped 1-3/4 to 2-1/4 inch (Micronesia) - Aquacultured
  CN-37497,  $ 64.99
  SW - Derasa Clam, Tiger Striped 2-1/4 to 2-3/4 inch (Micronesia) - Aquacultured
  CN-37498,  $ 69.99
  SW - Derasa Clam, Tiger Striped 2-3/4 to 3-1/4 inch (Micronesia) - Aquacultured
  CN-37482,  $ 74.99
  SW - Derasa Clam, Tiger Striped 3-1/4 to 3-3/4 inch (Micronesia) - Aquacultured
  CN-37483,  $ 79.99
  SW - Derasa Clam, Tiger Striped 3-3/4 to 4-1/4 inch (Micronesia) - Aquacultured
  CN-37484,  $ 84.99
  SW - Derasa Clam, Tiger Striped 4-1/4 to 4-3/4 inch (Micronesia) - Aquacultured
  CN-37499,  $ 89.99
  SW - Derasa Clam, Tiger Striped 4-3/4 to 5-1/4 inch (Micronesia) - Aquacultured
  CN-39036,  $ 94.99
 14-Day Guarantee
This item ships from our California facility. Learn about our shipping rates here .
Ships from California
Rewards Program
Do not release plants into local waters. Learn more here
Acclimation Guide
Learn how to properly acclimate your new species here.

We're here to help you with any questions or concerns. Call or email us here .
  Need Aquarium Supplies?  
Seachem Reef Buffer
Seachem Reef Buffer
As low as $6.35
Seachem Marine Buffer
Seachem Marine Buffer
As low as $6.35
  Free shipping on orders $49 and up!  
Diver's Den® WYSIWYG
Diver's Den® WYSIWYG

True Percula Clownfish

Mexican Turbo Snail

Weekly Specials
- Cleanup Crews
- Acclimation Guide
- Night Viewing
- Safe Ich Treatment
See More
Contact Us
Shipping Rates
Shipping Schedule
How to Order
Track Your Order
Rewards Program
Diver's Den Help
Gift Certificates
Business Partner Program
Email Newsletters
PayPal Credit     PayPal®
WI Facility Open Houses
About Us
Who We Are
Aquatics Specialists
Customer Comments
100% Guarantee
Visit our other sites:
Twitter YouTube Instagram Blog
Freshwater Fish   |   Pond Fish   |   Pond Plants   |   Brackish Fish   |   Freshwater Inverts   |   Freshwater Plants
Marine Fish   |   Corals   |   Live Rock   |   Tank Cleaners   |   Marine Inverts   |   Marine Plants
Visit our Retail Store   |   Tell a Friend About Us   |   Link to Us   |   Site Map   |   FREE Catalogs
bizrate Customer Certified Site - Reviews at Bizrate Drs. Foster & Smith BBB Business Review McAfee Secure sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
Copyright © 1997-2016, Petco Wellness, LLC. All rights reserved.
2253 Air Park Road, P.O. Box 100, Rhinelander, Wisconsin 54501
Terms of Use  |   Privacy Policy  |   Your CA Privacy Rights  |   Copyright Claims  |   Pet Medical Records Policy