Tridacna derasa, commonly known as the “derasa clam” or the “maxima clam,” is a species of giant clam found in the Indo-Pacific region. These clams are well-regarded for their impressive size and vibrant, colorful mantles, making them a popular choice for marine aquarium enthusiasts.
Habitat: Tridacna derasa is found in the warm, tropical waters of the Indo-Pacific region, including the Red Sea, the Great Barrier Reef, and various other coral reef systems. They typically inhabit shallow, well-illuminated areas on the reef flats or in lagoons. These clams often attach themselves to hard substrates like coral rubble or rocks using byssal threads.
Here are some key characteristics and information about Tridacna derasa clams:
- Size: Tridacna derasa is one of the larger species of giant clams. They can grow to significant sizes, with some individuals reaching lengths of up to 24 inches (60 cm) or more and weighing several kilograms.
- Shell: The shell of Tridacna derasa is robust, heavy, and typically elongated in shape. The color of the shell can vary but is often brown, green, or a combination of colors. The shell may also have distinctive patterns and markings.
- Mantle: The mantle of Tridacna derasa clams is renowned for its striking colors and intricate patterns. The mantle can be various shades of blue, green, brown, or even purple, and it often features eye-catching designs and iridescence.
- Symbiotic Relationship: Like other giant clams, Tridacna derasa clams have a symbiotic relationship with photosynthetic zooxanthellae, which are algae that reside within their tissues. These algae perform photosynthesis, providing the clam with essential nutrients while benefiting from the clam’s protection and access to nutrients.
- Habitat: Tridacna derasa clams are typically found in shallow, tropical reef environments with clear and well-illuminated waters. They depend on sunlight for their symbiotic algae to carry out photosynthesis.
- Conservation: Giant clams, including Tridacna derasa, are susceptible to overexploitation and habitat degradation. Many species of giant clams are protected, and there are regulations in place to prevent their decline.