Critically Endangered· population decreasing· assessed 2024

Gigas Giant Clam

Tridacna gigas

Sighting evidence at Cod Hole, Great Barrier Reef

Evidence at this site

15 records within 25 km

Confidence: medium

Last confirmed Nov 2025

Seasonality

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How is this calculated?

Sighting evidence is compiled from iNaturalist observation records within a set proximity radius, filtered for quality-grade observations. “Last confirmed” is the date of the most recent research-grade record. Record count covers a rolling 24-month window. Confidence reflects record count, recency, and consistency of seasonal signal.