For more than 400 million years, sharks have survived changing climates, shifting continents, and five mass extinction events. Today, however, shark populations are declining more rapidly than any other time in their evolutionary history, and not because they can’t adapt, but because modern pressures are harming sharks faster than populations can recover. As apex predators, sharks help regulate marine food webs. Their presence prevents any one species from dominating an ecosystem, allowing coral reefs, seagrass meadows, kelp forests, and open-ocean food webs to remain balanced. Conservation experts describe sharks as indicator species because healthy shark populations are closely linked to healthy oceans. When sharks disappear, the ecological effects can be seen through entire marine communities, altering fish populations, degrading habitats, and reducing biodiversity.
In the past decade, advances in conservation technology have transformed our understanding of shark ecology. Collaborative research led by OCEARCH and its scientific partners have tracked white sharks across thousands of miles of the western North Atlantic, revealing that these animals return year after year to the same feeding grounds, migratory paths, and wintering habitats. These studies identified previously unknown critical habitats stretching from Atlantic Canada to the Gulf of Mexico and demonstrated that sharks rely on an interconnected network of coastal and offshore ecosystems throughout their lives. Similar research on tiger sharks, great hammerheads, and other highly migratory sharks has shown that sharks are responding to warming ocean temperatures by adjusting their seasonal ranges, often moving into areas with greater fishing activity. Nearly one-quarter of the ocean space used by sharks overlaps with industrial longline fisheries, making accidental capture (bycatch) one of the greatest threats to many shark species. Even sharks released alive after accidental capture may later die from physiological stress, injuries, or exhaustion, prompting fisheries managers to adopt science-based solutions such as circle hooks, improved release protocols, and seasonal fishing closures where shark activity is highest.
Perhaps the greatest lesson from modern shark science is that protecting sharks means protecting the places they depend upon. Many species spend their earliest years in shallow estuaries, mangrove forests, seagrass meadows, and coastal bays before migrating into deeper offshore waters as adults. These nursery habitats provide shelter from predators, abundant prey, and the environmental conditions young sharks need to survive. If these habitats are destroyed by coastal development, pollution, or weakened environmental protections, shark populations will decline even when fishing pressure is reduced. Recent changes to the interpretation of the U.S. Endangered Species Act have raised concerns among marine scientists because they change how habitat impacts are evaluated during federal decision-making. All this highlights the importance of protecting critical marine ecosystems before they are lost. Decades of research from organizations such as OCEARCH and leading shark scientists around the world continue to reinforce a simple conclusion: conserving sharks is not only about protecting an extraordinary group of animals—it is about preserving the health, resilience, and future of the oceans that sustain all life on Earth.