New fish stunning technologies are improving slaughter welfare for species that were previously difficult to stun humanely.
Fish slaughter welfare has improved substantially for salmon as electrical stunning has become industry standard in leading producers. Other species including sea bass, seabream, and tilapia present different challenges. CO2 used widely in sea bass and seabream slaughter causes aversive responses before unconsciousness. Research into species-specific effective stunning is progressing, with welfare improvements in species accounting for millions of fish annually.