Ships Trapped near Strait of Hormuz Could Become Nurseries for Invasive Species

The ongoing standoff in the Strait of Hormuz has captured headlines for months, but a new threat has emerged from the shadows. As ships continue to idle in the Persian Gulf and Gulf of Oman, researchers warn that the consequences could be far-reaching – not just economically, but ecologically as well.

Biofouling, the accumulation of marine organisms on ship hulls, is a well-documented phenomenon. With over 1,500 vessels stuck in the strait for nearly four months, conditions are ripe for a global “super-spreader” event. According to a study published in Biological Invasions, these organisms could spread to new parts of the world when trade resumes, potentially triggering a massive marine invasive species event.

This is not just an environmental concern; it’s also a warning sign for global supply chains. As the world’s most critical maritime energy chokepoint, the Strait of Hormuz facilitates the passage of over $600 billion in annual energy trade. The potential consequences of biofouling are staggering: increased greenhouse gas emissions, reduced fuel efficiency, and even the displacement of local species.

The International Maritime Organization (IMO) has long recognized the dangers of biofouling, advising that ships idling for more than 30 days require immediate intervention to manage the issue before sailing. But with vessels stranded for months in peak marine organism growth and reproduction season, it’s a challenge unlike anything previously documented.

Shipping is already the primary pathway for marine invasive species. The spread of these organisms has caused severe damage worldwide, from the Gulf region to the Atlantic and Pacific oceans. For example, the Asian green mussel displaced local species in the Caribbean region and the South Atlantic Ocean, causing ecological damage.

The economic implications are significant. Biofouling-related drag can increase fuel consumption and emissions by over 50%, while even a thin layer of slime can boost greenhouse gas emissions by up to 25%. The IMO estimates that around 10% of the shipping industry’s fuel use is spent overcoming biofouling-related drag.

Divers are being deployed across Gulf ports to scrape hulls and propellers before ships can resume commercial operations. Fees for cleaning a single vessel could increase by as much as 60%, reaching around $8,000 per ship as operators rush to leave the Gulf.

While the world has largely focused on the economic fallout of the conflict, researchers say one of its most enduring legacies could be an invisible ecological catastrophe. Justus Heinrich, who leads marine underwriting at Allianz, notes that “it was always realistic disaster scenarios. But now, we have seen a real disaster scenario, which means that theoretical risks have turned into practical risks.”

The Strait of Hormuz stalemate has exposed the vulnerabilities of global supply chains and highlighted the need for more robust biofouling management practices. As trade resumes, it’s essential to prioritize in-water cleaning of ships to remove biofouling prior to departure. International cooperation is also crucial to prevent the spread of invasive species.

In this crisis, we see a stark reminder that economic interests often come at an environmental cost. The consequences of inaction could be catastrophic – both economically and ecologically. As the world waits with bated breath for a resolution to the Strait of Hormuz standoff, it’s imperative to prioritize the long-term sustainability of our global supply chains.