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Walking catfish
The walking catfish (''Clarias batrachus'') is a species of freshwater airbreathing catfish native to Southeast Asia, but also introduced outside its native range where it is considered an invasive species. It is named for its ability to "walk" across dry land, to find food or suitable environments. While it does not truly walk as most bipeds or quadrupeds do, it has the ability to use its pectoral fins to keep it upright as it makes a sort of wiggling motion with snakelike movements. This fish normally lives in slow-moving and often stagnant waters in ponds, swamps, streams and rivers, flooded rice paddies or temporary pools which may dry up. When this happens, its "walking" skill allows the fish to move to other sources of water. Considerable taxonomic confusion surrounds this species and it has frequently been confused with other close relatives.〔Ng, Heok Hee, and Kottelat, Maurice (2008). ''The identity of Clarias batrachus (Linnaeus, 1758), with the designation of a neotype (Teleostei: Clariidae).'' Zoological Journal of the Linnean Society 153: 725–732.〕
== Characteristics and anatomy ==
The walking catfish has an elongated body shape, and reaches almost in length and in weight.〔 Often covered laterally in small white spots, the body is mainly coloured a gray or grayish brown.〔 This catfish has long-based dorsal and anal fins〔 as well as several pairs of sensory barbels. The skin is scaleless, but covered with mucus, which protects the fish when it is out of water.
One main distinction between the walking catfish and native North American ictalurid catfish is the walking catfish's lack of an adipose fin.〔
This fish needs to be handled carefully when fishing it due to its hidden embedded sting or thorn-like defensive mechanism hidden behind its fins (including the middle ones before the tail fin, like the majority of all catfishes).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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