Thai National Parks

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Amphibians of Thailand

Species of Thailand

Crab-eating frog

Thai: กบน้ำเค็ม

Binomial name: Fejervarya cancrivora, Johann Ludwig Christian Gravenhorst, 1829

The crab-eating frog (Fejervarya cancrivora), is a frog native to south-eastern Asia including Taiwan, China, the Philippines and more rarely as far west as Orissa in India. It inhabits mangrove swamps and marshes and is the only known modern amphibian which can tolerate salt water. It is locally favored for its eating quality and is often farmed for its edible legs.

This frog can tolerate marine environments (immersion in sea water for brief periods or brackish water for extended periods) by increasing urea production and retention, and by remaining slightly hyperosmotic within urea and sodium flux. Adults can survive in salt water with salinity as high as 2.8%, and tadpoles can survive salinities as high as 3.9%.

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Scientific classification

Fejervarya cancrivora

Common names

  • English:
    • Crab-eating frog
    • Mangrove frog
    • Rice field frog
    • Asian brackish frog
  • Thai:
    • กบน้ำเค็ม
    • กบน้ำเค็มใหญ่


  • Rana cancrivora ssp. raja, Malcolm Arthur Smith (1930)
  • Fejervarya raja, Malcolm Arthur Smith (1930)
  • Rana cancrivora, Johann Ludwig Christian Gravenhorst (1829)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

Range map of Fejervarya cancrivora in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

It is free to use this map on various media. See the creative common license terms by clicking "CC" icon below the map. But remember, again; the map may not be accurate or complete.

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