Common carp and related species account for approximately one-third of global aquaculture production by volume, yet they receive virtually no welfare attention despite evidence of significant pain sensitivity and complex behavioral needs.
Carp welfare is arguably the largest unaddressed welfare problem in food production by sheer number of animals affected. The scale of carp aquaculture - tens of billions of fish annually - dwarfs all other aquaculture sectors, yet welfare standards specifically addressing carp are essentially nonexistent. The combination of high stocking density, oxygen management failures, live transport stress, and inhumane slaughter creates welfare deficits throughout the production cycle. Individual welfare events - oxygen crashes, disease outbreaks, rough handling during harvest - cause acute suffering at a scale that challenges comprehension. The invisibility of carp welfare reflects both cultural assumptions about fish sentience and the economic context of a predominantly developing-country industry.