The body colour is generally solid black to greyish.During spawning season, males exhibit dark black body colour and their unpaired fins are lined with bluish edges.

• 躯干一般全黑或灰色，每逢繁殖季节雄鱼体色便会转为深黑色，背鳍、臀鳍和尾鳍边缘泛蓝白色。