Welfare considerations for farmed abalone — a high-value marine gastropod with uncertain but important welfare status.
Abalone aquaculture raises welfare questions that parallel those of other invertebrate farming. While the sentience of abalone remains uncertain, their complex nervous systems and behavioural responses suggest some capacity for nociception. The precautionary principle suggests that farming conditions should minimise potential suffering.
In intensive abalone farming systems, stocking density is a primary welfare variable. Overcrowding increases competition for substrate and food, causes chronic stress responses measurable through haemolymph parameters, and reduces growth rates. Water quality management — particularly dissolved oxygen, temperature, and ammonia — directly affects physiological state and likely any capacity for distress.
Abalone viral ganglioneuritis (AVG) causes severe neurological disease in affected animals — wasting, unusual postures, loss of adhesion, and death. The pathology suggests significant neurological compromise. Disease outbreaks cause welfare concerns regardless of the uncertainty about abalone sentience.