The transport of ornamental fish from source countries to retail markets involves stressful conditions that cause significant mortality and welfare harm, with bag transport in low-oxygen water being the primary welfare challenge.
Ornamental fish transport welfare is a substantial welfare problem that is largely invisible to consumers who see healthy fish in retail tanks without knowing the mortality rate during transit. Wild-caught marine fish suffer the highest mortality because they are transported with no pre-transport acclimation and have no domestication history that would reduce stress responses. The welfare case for preferring captive-bred ornamental fish over wild-caught specimens is strong: better survival during transport, lower acute stress responses, and no contribution to wild population pressure. Consumer choices that signal preference for captive-bred fish provide market incentives for source-country transition from wild capture to aquaculture for ornamental supply.