霓虹灯鱼又称日光灯鱼，是一种小型热带鱼。身长4厘米左右，身体两侧各有一条深兰色条纹，眼睛有一块金色斑，可以发出金属光。背鳍、腹鳍、胸鳍均透明，但能发出兰色荧光，尤其在黄昏时，如星光流动。但如果长期在黑暗中，荧光会暗下来。不适合与大型鱼类混养。原产于南美洲亚马逊河上游树荫下比较平静的水域。

霓虹灯鱼对水温水质要求不太严格，在水温为21-30℃均可生长，对饵料要求也不严格，喜好成群活动。

霓虹鱼繁殖期间需要遮光，孵化卵和鱼苗都需要在阴暗的环境中生长.

The neon tetra (Paracheirodon innesi) is a freshwater fish of the characin family (family Characidae) of order Characiformes. The type species of its genus, it is native to blackwater or clearwater streams in southeastern Colombia, eastern Peru, and western Brazil, including the tributaries of the Solimões where the water is between 20 and 26 °C (68 and 79 °F). It is not found in the whitewater rivers of Andean origin. Its bright colouring makes the fish visible to conspecifics in the dark blackwater streams, and is also the main reason for its popularity among tropical fish hobbyists.