Whatever the method it has to numb the pain, or kill the fish so quickly it doesn't notice.
Unless you have access to kryogenic methods such as liquid nitrogen, freezing slows the brain function, but does not kill it quickly. Ice crystals form in the body, causing more pain.
Unless you have access to kryogenic methods such as liquid nitrogen, freezing slows the brain function, but does not kill it quickly. Ice crystals form in the body, causing more pain.