Overview
The Derasa Clam (Tridacna derasa) is a intermediate saltwater species known for its tan-brown, green striped mantle coloration. Hardiest giant clam. Bottom.
Origin & Appearance
Origin: Indo-Pacific.
Colors: Tan-Brown, Green striped mantle.
Body Shape: Bivalve (hinged shell). Typical adult dimensions: 50.0 x 25.0 x 40.0.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 79 gallons |
| Temperature | 75–81°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | low |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Bottom |
Behavior & Activity
Sessile filter feeder; sits on substrate; opens large mantle; may slowly shift position over weeks; near-stationary
Speed: 2/100Aggression: 1/10diurnal
Breeding
Not bred at home; broadcast spawner
Common Diseases
💊 Starvation💊 needs phytoplankton/strong light
Expert Notes
Hardiest giant clam; less light needed