Tridacna

Tridacna is a genus of large marine bivalve molluscs, commonly known as giant clams. These fascinating invertebrates are native to the shallow, warm waters of the Indo-Pacific region. They are the largest living bivalve shells on Earth. Giant clams are filter feeders, drawing water in through their siphons and filtering out plankton and other small organisms for sustenance. A unique symbiotic relationship is central to their survival. They host photosynthetic dinoflagellates, known as zooxanthellae, within their mantle tissues. These algae provide the clam with up to 90% of its energy through photosynthesis, a process that gives the clams' mantles their vibrant and varied coloration.

The shells of Tridacna are highly prized for their size, beauty, and the opalescent nacre lining the interior. Historically, these shells were used by humans for various purposes, including as bowls, decorations, and even for religious artifacts. Due to their size and the beauty of their shells, giant clams have been heavily exploited by humans, leading to significant population declines in many areas. This overfishing, coupled with habitat destruction and pollution, has resulted in several Tridacna species being listed as endangered or critically endangered. Conservation efforts are underway to protect remaining populations and restore their habitats, including marine protected areas and captive breeding programs.