Yellowtail amberjack is a premium farmed fish species in Japan, Australia, and the Mediterranean. Managing crowding, stress, and aggressive behavior is central to yellowtail welfare in intensive systems.
Yellowtail farming raises significant welfare concerns rooted in the mismatch between the species' wild biology and the constraints of net cage systems. As highly active pelagic predators, yellowtail in the wild engage in sustained fast swimming across open water — a behavior cage systems fundamentally restrict. Crowding in net pens at high densities drives aggressive interactions during feeding, causing fin and scale damage that creates infection pathways. Japanese farming methods have historically relied on wild-caught baitfish — itself an indirect welfare concern for the billions of small fish used as feed. Transitions to formulated feeds reduce this problem but require careful management to maintain feed acceptance. Stunning methods before harvest vary; some traditional approaches involve prolonged air exposure, which causes significant stress and suffering. Industry improvement requires adoption of pre-slaughter stunning, density management, and injury monitoring protocols.