Marbled Eel

Anguilla marmorata

The marbled eel, known scientifically as Anguilla marmorata, is a large tropical anguillid eel found in the Indo-Pacific region and adjacent freshwater habitats. It is distinguished by its cylindrical body, well-developed pectoral fins, and a protruding lower jaw. Its mottled coloration, with a yellow body and greenish-brown to black marbling on the back, sets it apart from other eel species. The dorsal fin begins closer to the gill opening than the anus, a unique feature among its relatives. Marbled eels can grow up to 2 meters in length for females and 1.5 meters for males, weighing as much as 20.5 kilograms. They have a lifespan of up to 40 years. Marbled eels inhabit a wide range, from East Africa to French Polynesia, reaching as far north as southern Japan. They are found in freshwater and brackish environments, such as rivers, lakes, and estuaries, and are known to live at depths of up to 3000 meters, although most are found shallower than 40 meters. This species is catadromous, spending its adult life in freshwater and migrating to the ocean to spawn. Spawning occurs in deep sea areas, with known sites near the Mariana Islands. These eels are nocturnal carnivores, feeding on a diet of shrimp, crabs, bony fish, and frogs. While they are harmless to humans, they are of commercial importance in some regions, particularly in the food industry. The IUCN lists the marbled eel as Least Concern, although it is considered endangered in Taiwan.