Fish slaughter is the process of killing fish, typically after harvesting at sea or from fish farms. At least one trillion fish are killed each year for commercial consumption. Some fish harvesting uses controversial methods like suffocation in air, carbon-dioxide stunning, or ice chilling that have been called inhumane by many organizations such as the World Organisation for Animal Health. However, due to many culture's reliance on fish, some alternative methods of slaughter have been developed, including percussive stunning, pithing, shooting, and electrical stunning. While these methods are considered effective, they still face criticism, with some arguing that no method of fish slaughter can ever be truly humane.