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.
इसे कहाँ और कब देखें
"निवासी" का अर्थ है कि उस गंतव्य पर अधिकांश डाइव्स में उनसे मुलाकात होती है; "मौसमी" का अर्थ है कि वे सूचीबद्ध महीनों में विश्वसनीय रूप से मौजूद रहते हैं; इसके अलावा जो भी मिले वह बोनस है, योजना नहीं।
| गंतव्य | विश्वसनीयता | माह | नोट्स |
|---|---|---|---|
| Cairns & the Ribbon ReefsAustralia | Resident — seen on most dives | साल भर | |
| PalauPalau | Resident — seen on most dives | साल भर | |
| Raja AmpatIndonesia | Resident — seen on most dives | साल भर | |
| Sipadan & MabulMalaysia | Resident — seen on most dives | साल भर | |
| YapFederated States of Micronesia | Resident — seen on most dives | साल भर |
एक नज़र में सर्वश्रेष्ठ महीना
| माह | विश्वसनीय गंतव्य |
|---|---|
| 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 |
इन्हें समझना
आवास: Sunlit reef flats, lagoon floors, and upper slopes — shallow because its symbiotic algae need strong light.
रेंज: Coral Triangle, Micronesia, and the Great Barrier Reef; fished out of much of its former Indo-Pacific range, with reintroductions in several countries.
व्यवहार: 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.
आहार: Mostly sugars from symbiotic algae farmed in the mantle, topped up by filter feeding.
आकार: आमतौर पर लगभग 1.0 m; दर्ज अधिकतम गहराई 1.3 m (shell length; the largest reliably weighed animals exceed 200 kg).
इसके आसपास कैसे व्यवहार करें
Keep fins, gauges, and hands clear of the mantle and siphons; shadow the animal as little as possible and never test the closing reflex.
संरक्षण
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.
इनके लिए जाने-जाने वाले चार्टेड साइट
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