Sharks as apex predators maintain reef ecosystem health — their removal through overfishing creates trophic cascades that degrade the habitat conditions for thousands of reef species.
Reef ecosystems degraded by shark removal provide poorer welfare conditions for every fish and invertebrate that depends on coral structure. Reef fish living on algae-smothered coral have reduced habitat complexity, fewer feeding opportunities, and greater predator vulnerability from the indirect effects of apex predator removal. The welfare dimension of shark conservation extends beyond individual shark welfare to the ecosystem-level conditions that determine welfare outcomes for millions of reef animals. Protecting shark populations is simultaneously a welfare intervention for an entire ecosystem.