But there's a huge mortality rate as well - fish often die during the capture and transport processes, Teresa M. Telecky, senior director of the wildlife department for Humane Society International (HSI), told The Dodo, making the whole process incredibly cruel.
"Many fish are captured at depths that, when they are quickly brought to the surface, causes barotrauma, just like scuba divers would experience if they surfaced too rapidly from deep water," Telecky said. "Barotrauma causes physical damage to body tissues which can overstretch or rupture. Fish brought up too quickly will have bulging eyes and cloaca."
Fish collectors will also pierce a fish's swim bladder to quicken the capture process, Telecky explained.