As aquaculture and research interest in jellyfish and other marine invertebrates grows, their welfare status deserves scientific and ethical consideration.
Jellyfish and other marine invertebrates occupy the outer frontier of welfare consideration. Unlike fish or crustaceans, where evidence for nociception is substantial, jellyfish have nerve nets without centralized processing. Whether this architecture can support subjective experience of pain is genuinely unknown. The precautionary principle — given the enormous numbers involved in aquaculture and harvest — suggests that unnecessary suffering should be avoided even where consciousness is uncertain. As welfare science matures, the circle of moral consideration may expand further into the invertebrate world.