Watched a video recently and decided to share here...
Tail was removed when young to create a love shape fish. video 15mins onwards
Back was cut away to create the horn video 15mins onwards too
Ink was injected into the fish (not shown on video)
To prevent fatal injuries during mating, they cut away both the adult fishes mouth. Video 8mins onwards
Video is in Mandarin, those who can't understand, just watch how the procedure is done.
Very cruel.