Abalone Welfare in Aquaculture and Ranching Systems

Abalone (Haliotis species) are highly valued marine gastropods farmed globally. Their welfare considerations span from hatchery to harvest in both intensive and ranching systems.

Key Facts

Abalone are slow-growing — H. midae, the South African species, takes 7-8 years to reach market size
They are herbivorous, feeding on macroalgae, and require adequate kelp provision in intensive systems
Abalone are sensitive to water temperature changes, with thermal stress causing mortality at boundaries of their tolerable range
South Africa, China, and Japan are the major producers of farmed abalone globally

Welfare Considerations

Abalone welfare in intensive systems centres on food security — insufficient kelp provision causes starvation stress evidenced by reduced activity and increased mortality. Overcrowding causes physical damage from abalone stacking on each other, compromising the muscular foot essential for locomotion. Water quality management including dissolved oxygen and temperature stability is critical. Abalone lack centralised brains but have well-developed nervous systems that respond to noxious stimuli, arguing for precautionary humane harvesting approaches.

What You Can Do

Support research into abalone stress responses and welfare indicators in intensive aquaculture
Choose abalone from certified sustainable farms with published stocking density and survival rate data
Advocate for precautionary welfare standards for all farmed molluscs in aquaculture certification schemes
Encourage farms to provide adequate macroalgae provision as a core welfare requirement