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Mastacembelus armatus


Mastacembelus armatus
Tyre Track Eel
轮胎鳗
The Tire track eel (Mastacembelus armatus) is a species of ray-finned, spiny eels belonging to the genus Mastacembelus of the family Mastacembelidae, and is native to the riverine fauna of India, Pakistan, Sumatra, Sri Lanka, Thailand, Viet Nam, Indonesia and other parts of South East Asia. The species was named Mastacembelus armatus by Lacepède in 1800. The other common names for this popular aquarium species are Zigzag eel, Spiny eel, Leopard spiny eel and White-spotted spiny eel. 
Mastacembelus armatus is a large elongated fish that has a snake-like body without pelvic fins. Its anal and dorsal fins are elongated and are connected to the caudal fin. The dorsal fin is preceded by numerous spines. The back is dark beige in color while the head is silver-beige. The body’s color is dull brown and the belly is a lighter shade of brown. The body may also be marked with brown circular patterns. The body also have one to three darker longitudinal zigzag lines that connect to form a distinct reticulated pattern that is restricted to the dorsal two-thirds of the body. The eyes have brown stripes running laterally through them.
Mastacembelus armatus can reach up to 36" (91 cm) in its natural habitat but does not usually exceed 20" (51 cm) in captivity.
Despite its eel-like appearance, Mastacembelus armatus is not considered a true eel.
Mastacembelus armatus are nocturnal fish that thrive in highland streams, lowland wetlands, still waters, coastal marshes and rivers with sandy or rocky riverbeds and heavy vegetation. They are common during the tropical summer months and will dwell in canals, lakes and other floodplain areas during the flood season
体细长,前部稍侧扁,尾部扁薄。头长而尖,前端有1尖长的吻突。口下位,口裂浅,几成三角形,口角止于后鼻孔下方。上下颌均具绒毛状齿带;眼位于头的前部,被皮膜所覆盖。眼下斜前方有1尖端向后的小刺,埋于皮内。前鳃盖骨后缘一般具3枚短棘。体鳞甚细,侧线完全。背鳍基长,前部由35枚左右游离的短棘组成;臀鳍具棘2枚,第三鳍棘常埋于皮下;背鳍和臀鳍的鳍条部相对,基部均极长,且与尾鳍相连。胸鳍短圆,无腹鳍,尾鳍长圆形。体背侧灰褐色或黑褐色,腹部灰黄色;头背正中多有1条黑色纵带;头侧由吻端经眼至鳃盖上方也有1条黑色纵带,向后常断裂为1纵行黑色斑点,沿背鳍基底伸达尾鳍基底;体侧有淡色斑点,从而呈现黑色网纹或波状纵条纹;大形个体的斑纹不清。胸鳍黄白色,其它各鳍灰黑色,有淡色斑点,鳍缘有1灰白边。
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