Common name: Small giant clam

General information

The Maxima Clam, Tridacna maxima, is one of the most vibrant and sought-after species in the reef aquarium hobby. Known for its dazzling array of colors and patterns, this bivalve is not only beautiful but also serves an important role in the reef ecosystem. Maxima Clams can exhibit a variety of colors, including blues, greens, purples, and even gold. They are also recognized for their intricate mantle with iridescent spots or 'eyes' that can reflect light, adding to their appeal.

Care

Maxima Clams require stable tank conditions and intense lighting to thrive, as they host symbiotic zooxanthellae algae within their tissues, which provide nutrients through photosynthesis. They should be placed on stable rockwork or substrate where they can attach securely. It's crucial to maintain calcium and alkalinity levels to support their shell growth. They are filter feeders and will benefit from supplemental feeding of phytoplankton or fine particulate foods.

Reproduction

In the wild, Maxima Clams are broadcast spawners, releasing eggs and sperm into the water column for external fertilization. In the aquarium, breeding Maxima Clams can be challenging, but with proper conditions, they may spawn. Aquarists should be aware that larvae require specialized care and are difficult to raise.

Symbiosis

Maxima Clams have a mutualistic relationship with the zooxanthellae algae living within their mantle tissue. This symbiosis allows the clam to receive a significant portion of its nutritional needs from the photosynthetic byproducts of the algae, while the algae benefit from a protected environment and the clam's waste products.

Habitat

Tridacna maxima is found in the Indo-Pacific region, typically in shallow, well-lit reef environments where they can maximize the potential for photosynthesis. They often inhabit coral rubble areas or attach themselves to the reef structure.