Aquacultured Derasa Clam by LiveAquaria
The aquacultured Tridacna derasa Clam, also known as the Southern Giant Clam or Smooth Giant Clam, is the second largest species in the Tridacna genus, capable of reaching up to 24 inches in the wild. Unlike many other Tridacna species that feature a large byssal opening, Derasa Clams have a narrow gap on the underside of their thick, smooth shell.
They are often mistaken for Tridacna gigas, especially when small. Key identification features include six to seven vertical folds in the shell, which can be fully closed. In contrast, T. gigas has four to five vertical folds and cannot fully close its shell.
Smaller Derasa Clams are particularly sensitive to moderate lighting conditions and require careful attention to light intensity and water parameters.
| Feature | Detail |
|---|---|
| Species | Tridacna derasa |
| Common Name | Southern Giant Clam, Smooth Giant Clam |
| Shell Folds | 6 to 7 vertical folds |
| Byssal Opening | Narrow gap on underside |
| Light Sensitivity | High sensitivity to moderate lighting |
FAQ
How does the Derasa Clam differ from Tridacna gigas?
Derasa Clams have six to seven vertical folds in their shell and can fully close the shell. Tridacna gigas has four to five vertical folds and cannot fully close its shell. Derasa also has a narrower byssal opening compared to T. gigas.
What lighting conditions are recommended for Derasa Clams?
Smaller Derasa Clams are highly sensitive to moderate lighting. They require low to moderate light intensity to thrive and should be placed in areas with carefully controlled lighting.
Can Derasa Clams survive in home aquariums?
Yes, with proper care, including stable water parameters and appropriate lighting, Derasa Clams can thrive in home aquariums. However, they require consistent monitoring due to their sensitivity.
Boris Terry –
The Derasa Clam arrived healthy and looks beautiful in my tank. I noticed the six vertical folds clearly visible and it closed completely when touched. I’ve reduced the lighting to avoid stress and it’s been stable for over two months.
Jennifer Skinner –
It’s a striking addition to my reef tank. The shell is smooth and the folds are distinct. I had to adjust my lighting setup to match the clam’s sensitivity, but now it’s thriving under low moderate light.
Zoe Cameron –
First time keeping a giant clam and this one is impressive. The closure mechanism is unique and the color is vibrant. I’ve kept it in a well-maintained tank with stable water chemistry and it’s active daily.