Invertebrates
Giant Clam
Tridacna gigas · Bivalve mollusk, family Cardiidae, subfamily Tridacninae; the largest living bivalve
A mature giant clam is a reef landmark: a meter-plus of fluted shell holding a mantle patterned in electric blues, greens, and golds, no two animals alike. The colors come partly from iridescent cells managing light for the clam's real engine (symbiotic algae farmed in its tissues), which is why giants sit in the sunlit shallows gaping wide by day. Old stories about man-trap clams are folklore; a disturbed animal vents and closes slowly, and the largest cannot seal at all. The genuine drama is reproductive, broadcast spawning that fogs whole lagoon patches with gametes. Tridacna gigas has been fished out of much of its former range for meat and shell, and many animals divers meet today, notably in Palau, descend from hatchery restocking. Find the paired siphons, note the sunburst mantle pattern, and keep fins well clear.
Di mana dan kapan melihatnya
"Resident" berarti sebagian besar penyelaman di destinasi tersebut akan menjumpai mereka; "seasonal" berarti kehadirannya dapat diandalkan pada bulan-bulan yang tercantum; selain itu adalah bonus, bukan rencana.
| Destinasi | Keandalan | Bulan | Catatan |
|---|---|---|---|
| Cairns & the Ribbon ReefsAustralia | Resident: seen on most dives | Sepanjang tahun | |
| PalauPalau | Resident: seen on most dives | Sepanjang tahun | |
| Raja AmpatIndonesia | Resident: seen on most dives | Sepanjang tahun | |
| Sipadan & MabulMalaysia | Resident: seen on most dives | Sepanjang tahun | |
| YapFederated States of Micronesia | Resident: seen on most dives | Sepanjang tahun |
Bulan terbaik, sekilas pandang
| Bulan | Destinasi yang dapat diandalkan |
|---|---|
| January | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| February | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| March | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| April | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| May | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| June | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| July | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| August | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| September | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| October | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| November | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
| December | Cairns & the Ribbon Reefs · Palau · Raja Ampat · Sipadan & Mabul · Yap |
Memahaminya
Habitat: Sunlit reef flats, lagoon floors, and upper slopes, shallow because its symbiotic algae need strong light.
Sebaran: Coral Triangle, Micronesia, and the Great Barrier Reef; fished out of much of its former Indo-Pacific range, with reintroductions in several countries.
Perilaku: Sessile after settlement; gapes its patterned mantle to the sun by day, contracting and slowly closing when shadowed. Spawns by broadcast, fogging the water with gametes.
Diet: Mostly sugars from symbiotic algae farmed in the mantle, topped up by filter feeding.
Ukuran: biasanya sekitar 1.0 m; terdokumentasi hingga 1.3 m (shell length; the largest reliably weighed animals exceed 200 kg).
Cara berperilaku di sekitarnya
Keep fins, gauges, and hands clear of the mantle and siphons; shadow the animal as little as possible and never test the closing reflex.
Konservasi
Listed Vulnerable under a 1996 assessment widely considered out of date (recent studies argue it is far more threatened), locally extinct in parts of its range, and traded under CITES Appendix II; hatchery programs restock several countries.
Situs-situs terdata yang dikenal dengan hal itu
Lokasi yang disorot dipetakan untuk spesies ini oleh editor kami; angka-angkanya adalah catatan kemunculan GBIF yang dicatat dalam radius sekitar 5 km dari suatu lokasi sejak 1990.
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