Marine Protected Areas (MPAs) are primarily conservation tools, but they also have significant implications for fish welfare. Understanding how MPAs affect individual fish lives connects conservation and welfare science.
Marine Protected Areas represent a rare convergence of conservation and welfare goals: by protecting fish from harvest, they allow individuals to live longer, richer lives with lower chronic stress. Evidence shows that fish in well-enforced MPAs show behavioral changes associated with reduced fear and stress — they are less skittish, form different social groupings, and express more complex behavioral repertoires. This matters because fish welfare, like fish sentience, is increasingly recognized as morally relevant. MPAs create refugia where fish can live as fish evolved to live, rather than in the heightened vigilance state of heavily fished populations. Expanding and strengthening MPA networks is thus simultaneously a conservation, fisheries management, and animal welfare intervention.