The giant protuberance on the head of this male Flowerhorn led to this fish's Chinese name luohan, as the hump is reminiscent of the Chinese Buddhist
Shou, who also has
a swelling forehead (fig.).
Besides the hump, which is officially known as
kok or nuchal hump,
differ from females (fig.)
by a much
thicker and more
pronounced mouth, and longer anal and dorsal fins (fig.).