Yellowtail kingfish is Australia's most important marine aquaculture species, with welfare challenges from its active, schooling nature and intensive sea cage conditions.
Yellowtail kingfish welfare in sea cages is shaped by the species highly active nature and sensitivity to crowding. Unlike slower-moving flatfish or benthic species, yellowtail kingfish require large cage volumes with good current flow to express normal schooling behaviour. Net fouling that restricts water exchange rapidly compromises welfare by reducing oxygen and elevating waste product concentrations. Slaughter quality is directly linked to welfare - fish that are stressed at harvest have inferior flesh quality, creating a commercial incentive aligned with welfare improvement. Iki jime (spike killing through the brain) is the gold standard slaughter method used in premium production for Japanese markets.