Tridacna Derasa, also known as the “derasa clam” or “maxima clam,” is a large clam species found in the Indo-Pacific. They’re favored by marine aquarium enthusiasts for their impressive size and colorful mantles.
Tridacna derasa lives in warm tropical waters, such as those in the Red Sea, Great Barrier Reef, and other coral reefs. They usually settle in shallow, well-lit areas on reef flats or lagoons and attach themselves to hard surfaces like coral rubble or rocks using byssal threads.
Key Characteristics:
- Size: Tridacna Derasa clams can grow quite large, reaching up to 24 inches (60 cm) or more in length and weighing several kilograms.
- Shell: Their shells are robust, heavy, and typically elongated. The color can vary but is often brown, green, or a mix of colors, sometimes with distinctive patterns.
- Mantle: The mantle is known for its vibrant colors and intricate patterns. It can be shades of blue, green, brown, or even purple, often featuring striking designs and iridescence.
Symbiotic Relationship: Like other giant clams, Tridacna Derasa has a symbiotic relationship with tiny algae called zooxanthellae that live in their tissues. The algae perform photosynthesis, providing the clam with essential nutrients, while the clam offers them a protected environment and access to sunlight.
Conservation: Giant clams, including Tridacna Derasa, face threats from overfishing and habitat loss. Many species are protected by regulations to help prevent their decline.
