D. Parer & E. Parer-Cook / Giant Clam (Tridacna gigas) spawning, Great Barrier Reef, Queensland, Australia

Doug Perrine / Giant clam {Tridacna sp} Palau, Micronesia

Gary Bell/ Oceanwide / Giant Clam (Tridacna sp) siphon, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Giant Clam (Tridacna sp), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Giant Clam (Tridacna sp) mantle, Great Barrier Reef, Australia

Richard Robinson / Giant Clam (Tridacna sp.) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Richard Robinson / Giant Clam (Tridacna sp.) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Richard Robinson / Giant Clam (Tridacna sp.) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji. January.

Linda Pitkin / Giant Clam, siphon (Tridacna sp.) Sangeang, off Sumbawa, Indonesia.

Pete Oxford / Giant Clam (Tridacna gigas), Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Giant Clam (Tridacna gigas), Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Giant clam (Tridacna sp) Rainbow Reef, Fiji, South Pacific.