Coral reef ecosystems support extraordinary biodiversity, and the welfare of reef fish is implicated in the management of fishing pressure, reef degradation, and climate change impacts.
Marine protected areas represent one of the most evidence-backed interventions for reef fish welfare. By reducing fishing pressure within defined areas, MPAs allow fish populations to recover density and age structure — meaning individual fish are less likely to encounter lethal fishing pressure and more likely to live to older ages with better nutritional status. The welfare benefits extend beyond protection from fishing: healthier reef ecosystems support more diverse and abundant food webs, reducing competition stress and improving nutrition. Climate-driven thermal bleaching is the greatest emerging threat to reef fish welfare, making carbon reduction as much a welfare issue as a conservation one.