Coral Reef Ecosystem Welfare and Marine Animals

Coral reefs support the highest marine biodiversity, and their decline from climate change and human pressures causes welfare harms for billions of marine animals that depend on them.

Key Facts

Coral reefs cover less than 1% of the ocean floor but support 25% of all marine species
Ocean warming has caused mass coral bleaching events affecting 50%+ of the Great Barrier Reef
Bleaching occurs when corals expel their symbiotic algae from heat stress, leading to starvation
Fish populations in reef systems have declined dramatically as reefs have degraded
Reef fish undergo behavioral changes and increased stress hormones as reef quality deteriorates
Reef restoration through coral gardening is being scaled up globally with some success

Welfare Considerations

The degradation and death of coral reefs displaces and kills the billions of fish, invertebrates, and other animals that depend on reef structure for shelter, food, and reproduction. Fish forced from declining reefs face increased predation risk, reduced food availability, and reproductive failure. The loss of structural complexity removes refuges that prey species depend on for survival. While reef ecosystem welfare is harder to assess than individual animal welfare, the scale of suffering from reef decline is enormous.

What You Can Do

Reduce your carbon footprint to address the primary driver of coral bleaching
Choose sustainably sourced seafood to reduce pressure on reef fish populations
Avoid touching corals or anchoring on reefs when snorkeling or diving
Support reef restoration organizations and citizen science monitoring programs
Advocate for marine protected areas that allow reef recovery from fishing pressure