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Batagur affinis

Southern River Terrapin

Habitat:

Brackish estuaries, mangrove creeks, tidal river reaches, coastal lagoons, and inland freshwater rivers

Threats:

– Habitat destruction, alteration, and conversion
– Collection of adults and eggs for consumption
– Incidental capture in fishing gear
– Sand mining and hydropower dams

Wild Population:

Decreasing
Estimated population reduction greater than 90%
Extirpated or likely extirpated from Indonesia, Singapore, Thailand, and Vietnam
Populations highly fragmented

Conservation Efforts:

– Captive breeding and assurance colonies
– Hatchling and head start release
– Population surveys and monitoring
– Community outreach programs
– Protected in Cambodia and Thailand
– CITES Appendix II

Endangered Status:

Species Snapshot

Fast Facts

The Southern River Terrapin is divided into two subspecies: Western Malay River Terrapin (Batagur affinis affinis) and Eastern Malay River Terrapin (Batagur affinis edwardmolli).

This species is colloquially called “tuntung” in Malaysia and “tuntong” in Indonesia. The names derive from the reverberating sound made by the turtle’s plastron as the female packs its nest with sand following egg laying. “The turtles’ tamping action sounds like drums playing primeval staccato rhythms.” –  Mittermeier et al.

The Southern River Terrapin, known commonly in Cambodia as the “Royal Turtle,” was declared the National Reptile of Cambodia by decree in 2005.

The common name of “Royal Turtle” in Cambodia derives from the account that this species’ eggs are considered a delicacy and aphrodisiac. During the 19th and early 20th centuries, nesting areas were protected from general exploitation and egg collection and consumption was reserved for royalty.

This species exhibits marked sexual dimorphism (morphological differences between males and females) in the form of sexual dichromatism (color differences between males and females). While females remain in a muted state of coloration throughout the year, the pigment melanin is hyper-expressed in males during the breeding season, giving them an overall dark grey to black appearance. The melanin expression is especially pronounced on the head and neck region; starkly contrasted by golden-yellow eyes.

In parts of this species’ range, the adult turtles are protected from consumption as “haram” by Islamic law, the predominate religion of Malaysia. This haram however does not protect the eggs of the species, and over collection of the eggs has resulted in a massive reduction in the recruitment of new turtles into the population. Furthermore, as non-Muslims began populating the region in larger numbers after World War II, the “haram” no longer gave the species the widespread protection it once had in those areas.

The aftermath of wars and regime changes have had a significant impact on this species. During World War II, the Southern River Terrapin was heavily harvested to feed the Japanese soldiers occupying the region. Additionally, untold numbers of this species were collected for market following the fall of the Khmer Rouge communist regime in Cambodia.

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