Why June 5 Matters for the Oceans: The Global Push to Stop Illegal Fishing

June 5 is a global reminder that the world’s oceans are under pressure from illegal, unreported, and unregulated fishing, a problem that threatens marine biodiversity, food security, and the livelihoods of coastal communities.

Observed as the International Day for the Fight against Illegal, Unreported and Unregulated Fishing, the UN-backed awareness day is meant to mobilize governments, industry, and consumers around more sustainable fisheries management and stronger enforcement at sea and in ports.

Why the issue matters

According to the Food and Agriculture Organization, IUU fishing includes activities such as fishing without authorization, misreporting catches, operating in prohibited areas, and harvesting species that are protected or overexploited.

The scale is significant: the FAO estimates that IUU fishing accounts for about 20% of the world’s catch, while other estimates cited in observance materials put the annual loss at 11 to 26 million tons of fish worth USD 10 to 23 billion.

That matters well beyond the fishing industry. Illegal fishing distorts markets, undercuts law-abiding fishers, weakens food security, and puts pressure on already fragile marine ecosystems.

A UN day with a practical goal

The United Nations General Assembly declared June 5 as the observance date to spotlight the harms caused by IUU fishing and to encourage international cooperation against it.

The date also connects to the entry into force of the Port State Measures Agreement, a key international treaty designed to stop illegally caught fish from entering ports and markets.

What is being done

Global efforts now focus on better monitoring, stronger laws, traceability in seafood supply chains, and tighter port inspections.

The FAO says its anti-IUU work is supported by tools such as the Code of Conduct for Responsible Fisheries and the Port State Measures Agreement, which aims to block illicit catches from being landed and sold.

That enforcement angle is important because IUU fishing is not just a conservation issue. It is also tied to unfair competition, labor abuse, and in some cases broader criminal activity.

Why consumers should care

Seafood on store shelves can be hard to trace, which means buyers may support destructive fishing practices without realizing it.

That is why today’s campaign pushes for better seafood traceability, stronger regulation, and more public awareness about where fish comes from and how it was caught.

As countries mark the day with campaigns and events, the message is simple: protecting fish stocks is also about protecting food systems, ocean health, and the future of coastal economies.