Tridacna Derasa

Datasheet

General Description

The Tridacna derasa Clam, also known as the Southern Giant Clam or Smooth Giant Clam, is the second-largest species among all the Tridacna spp., with a maximum size reaching up to 24 inches in the wild. Unlike its relatives, this clam features a narrow gap on the underside of its thick and smooth shell, with six to seven vertical folds that it can close completely.

Aquarium Suitability

Derasa Clams are suitable for reef aquariums, provided they are carefully acclimated to moderate lighting conditions to prevent stress, especially the smaller specimens with thinner membranes. They rely significantly on photosynthesis from zooxanthellae cells in their mantle, but supplementing with micro foods designed for filter feeders is essential, particularly for younger clams.

Demands, Care, and Hardiness

Being moderately demanding, Derasa Clams require stable water conditions, including a temperature range of 74-82°F, a pH between 8.1-8.4, and a specific gravity of 1.020-1.025. Additionally, supplementing the aquarium with calcium, magnesium, strontium, and trace elements is crucial for their health. They thrive in moderate lighting and medium water flow environments.

Reef Suitability

Derasa Clams are reef-compatible, contributing to the diversity and beauty of a reef aquarium. Their ability to host zooxanthellae for photosynthesis makes them beneficial for the overall ecosystem within the tank.

Aquarium Setup

When setting up an aquarium for Derasa Clams, it is essential to provide moderate lighting levels and a gradual acclimation process to prevent light-induced stress. Placing them on a small rock or in a plastic dish with coarse substrate at the tank's bottom initially allows for proper adjustment before slowly moving them to the desired position in the aquarium.

Behaviour

Derasa Clams are relatively peaceful inhabitants in the aquarium and are known to exhibit filter-feeding behavior. They will regularly open up their shells to filter nutrients from the water, contributing to the overall water quality in the tank.

Feeding and Diet

While Derasa Clams primarily rely on photosynthesis, supplementing their diet with micro foods like phytoplankton is crucial, especially for smaller individuals. Offering a variety of micro-foods designed for filter feeders helps ensure their nutritional needs are met.

Habitat and Distribution

These clams are found in the Indo-Pacific region, inhabiting shallow waters with access to sunlight for their photosynthetic needs. Derasa Clams are commonly distributed in areas with suitable conditions for their survival and growth.