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Introduction

Scabies crispata, also known as the Green Thai Freshwater Mussel, is an Asian freshwater mussel belonging to the family Unionidae. It lives mainly within the substrate, filtering the water to capture organic particles and microscopic plankton. Its aquarium interest is based mostly on its natural appearance and filter-feeding lifestyle rather than on highly visible activity. This species is collected from the wild and remains uncommon in the aquarium trade. It requires stable, well-oxygenated water free of contaminants. A mature aquarium with suitable substrate and a steady supply of fine suspended food is important for long-term maintenance.

General species description

Scabies crispata is a freshwater mussel of the genus Scabies, adapted to a benthic lifestyle. Like other unionids, it partially or completely buries itself in the substrate, usually leaving the posterior part of its valves exposed to maintain water circulation. It feeds by filtration and can remove some suspended particles, but a home aquarium does not always produce enough natural food to support it over time. Long-term care therefore requires a mature system, clean water and a consistent supply of fine food particles in the water column. Because it is wild collected, slow acclimation and careful observation are especially important.

Geographical origin and biotope

Country of reference: Thailand. Scabies crispata is associated with inland freshwater habitats in Southeast Asia, including rivers and quieter areas where the bottom allows burrowing. Its habitat combines well-oxygenated water, a soft substrate made of sand, silt or small gravel, and some natural accumulation of organic material. Riparian vegetation helps provide shade and stabilize the banks. In an aquarium, it is best to recreate a clean, stable and lightly disturbed environment with non-abrasive substrate and regular water movement, while avoiding excessively strong currents that could repeatedly dislodge the mussel.

Precise location and local name

Detailed location information and a local vernacular name are not included here. The English trade name Green Thai Freshwater Mussel refers to its Thai origin and the greenish coloration generally associated with its shell. In the trade, English names may sometimes group together freshwater mussels with similar appearances, so identification by scientific name remains important. For a wild specimen, available collection data should be retained, including the country, drainage basin and substrate type, since these details may influence care requirements. The species should be treated as a benthic filter feeder, not simply as a decorative invertebrate.

Appearance and physical characteristics

The shell of Scabies crispata is elongated and sturdy, with coloration that may include green, olive or greenish-brown tones. The valves may display visible growth lines and a somewhat compressed shape, features commonly seen among freshwater mussels. As in other unionids, the soft body is protected by two hinged valves, while the muscular foot is used for anchoring and burrowing. Coloration can vary with age, shell wear and environmental conditions. In an aquarium, avoid handling the animal by its foot and select specimens with an intact shell free of cracks or unusual odors. Its olive-green appearance explains the common name.

General diet

Scabies crispata is a filter feeder that captures microscopic particles suspended in the water. Its natural diet mainly includes phytoplankton, very small zooplankton, bacteria and suspended organic matter. It does not feed like a fish and should not be expected to survive on visible algae or food scraps lying on the bottom. An aquarium intended for this mussel should be mature and provide a regular supply of fine particles without causing waste buildup. Feeding must remain moderate to protect water quality. A steady supply of suspended food and well-oxygenated water are essential for its survival.

Essential data

• Native river:
• Local name used:
• Origin of the scientific name: The genus name Scabies comes from Latin and refers to a rough surface; crispata means curled or wavy.
• Etymology of the full name: Scabies refers to roughness; crispata suggests a curled, wavy or folded appearance.
• Common/vernacular names: Green Thai Freshwater Mussel; Thai green freshwater mussel.
• Family: Unionidae
• Subfamily: Gonideinae
• Name pronunciation: SKAY-bee-ee KRIS-pah-tah
• Discovery: James Graham Cooper Gould, 1843
• Maximum adult size:
• Water temperature and pH: Stable, clean and well-oxygenated freshwater; keep parameters consistent.
• Stream appearance and surrounding vegetation: Freshwater courses with quiet areas, soft substrate and riparian vegetation.
• Typical tankmates: Peaceful benthic organisms from freshwater habitats.
• Temperament and behavior: Peaceful, discreet and mainly burrowing; filters the water.
• Water depth:
• Sexual dimorphism: Not externally apparent under ordinary aquarium conditions.
• Bottom configuration and flow: Sand, silt or fine non-abrasive gravel; steady flow without excessive turbulence.
• Aquarium status: Wild-collected species; uncommon availability, with a rarity level of 2.

In your aquarium

Success with Scabies crispata depends on a mature aquarium, stable water and an adequate supply of microscopic food. Use a soft substrate that allows burrowing, avoid treatments containing copper and protect the mussel from fish that may flip it over or damage it. Efficient filtration, good oxygenation and the absence of sudden changes support successful maintenance. Since it is wild collected, each specimen should be watched carefully during acclimation to confirm normal valve closure, activity and the absence of deterioration. Stability and water quality remain the keys to success.