The head and body of the Green Mandarin, also known as the Striped Mandarinfish or Green Mandarinfish, are a mazelike combination of blue, orange, and green. Males may be distinguished from females by their more-elongated first dorsal spine. It is extremely popular with aquarists because of its unusual beauty.
轉載自敘述青蛙的性別辨別方式
"more-elongated first dorsal spine" 應該是那根長長的背鰭