How the global fishing industry works, and why Australia's waters matter

The global fishing industry pulls roughly 90 million tonnes of wild fish from the ocean each year. That catch feeds nearly three billion people and underpins economies across Asia, Africa and the Pacific. But the system is fragile. Overfishing is emptying waters faster than fish can breed back. Rules are weak in international seas. And climate change is shifting fish populations in ways no one fully predicted. For Australia, which owns one of the world's largest ocean territories, understanding how global fishing works is essential to protecting both our waters and our food security.

The global fishing fleet and who owns it

Fishing today is industrial. Giant refrigerated vessels, some longer than football fields, hunt fish across ocean basins. The largest fleets belong to China, Russia, Japan, Spain and Peru. But ownership is opaque. Ships change flags between nations. Companies hide behind shell structures. A vessel caught breaking rules simply re-registers in a country with weaker enforcement and carries on.

The wealthy nations that own big fleets can afford to fish further afield. They send boats to West Africa, the Indian Ocean and the South Pacific, where local governments lack the money or navy to monitor their own waters. A fishing licence from a poor Pacific nation might generate critical government revenue, but the fish belong to the locals and leave the region.

The rules that govern the ocean, and where they fail

The United Nations Convention on the Law of the Sea established the framework in 1982. Coastal nations control waters to 200 nautical kilometres offshore (the exclusive economic zone, or EEZ). Beyond that lies international water, where fishing is supposed to follow agreements. Regional bodies like the Indian Ocean Tuna Commission set catch limits for shared fish stocks.

In practice, enforcement is weak. Illegal, unreported and unregulated fishing (IUU) accounts for roughly one in five fish caught globally. Vessels turn off tracking systems, fish at night, use false identities and bribe officials. The cost of patrols often exceeds the value of fines. Wealthy fishing nations have little incentive to crack down when their own fleets profit from the chaos.

Climate change and shifting fish

Fish move. Warming oceans are pushing species poleward and to deeper water. A fish stock that once stayed within one nation's EEZ may now range across multiple territories or into international water. This creates competition and conflict. Countries that relied on a fishery for decades suddenly lose access. Nations unprepared for new influxes of unfamiliar species struggle to regulate them.

The science of fish movement is improving, but policy lags years behind. Regional agreements rarely adjust fast enough. Developing nations dependent on fishing as a protein source face the sharpest risk.

What it means for Australia

Australia has the third-largest EEZ in the world, covering an area bigger than the continental mainland. Our waters are rich in tuna, toothfish, squid and rock lobster. Illegal foreign fishing in our zone costs the nation hundreds of millions of dollars annually. More broadly, Australian fishing communities depend on fish stocks that migrate across the Indo-Pacific, many of them under pressure from global overfishing.

Australia also imports seafood. Much of what reaches Australian supermarkets comes from regions where fishing rules are poorly enforced. Supporting stronger international agreements and better monitoring protects both our local industry and the global supply of affordable protein.

The bottom line

Global fishing is entering a critical decade. Fish stocks are finite. Climate change is rewriting the map of where fish live. The international system designed to share ocean resources fairly is strained and often ignored. Stronger enforcement, faster adaptation of quotas to climate science, and genuine transparency in vessel ownership are essential. For Australia, that means backing regional rule-making, protecting our own waters with better surveillance, and recognising that a stable global fishing system ultimately serves our interests too.

This article was compiled by AI and screened before publishing. See our editorial standards.