Stranded ships in Hormuz Strait threaten global biodiversity with invasive species

The sudden closure of the Strait of Hormuz on 28 February, following the outbreak of the U.S.–Israel war with Iran, has left more than 1,500 commercial vessels stranded in the Persian Gulf. Marine biologists warn that the prolonged immobilization of these ships has created a breeding ground for invasive marine species. As the hulls of the vessels become encrusted with a range of organisms—from microbes and algae to barnacles and other invertebrates—there is a growing concern that these organisms could be transported worldwide when shipping lanes reopen.

An international consortium of marine scientists has documented the rapid colonization of ship hulls by non‑native species. The team notes that the Gulf’s warm, nutrient‑rich waters provide ideal conditions for these organisms to thrive, potentially outcompeting local marine life if introduced to new ecosystems. The risk is amplified by the sheer number of vessels involved; thousands of ships could act as vectors, dispersing invasive species across multiple oceans and threatening biodiversity, fisheries, and coastal economies.

As global trade resumes and these ships re-enter international waters, authorities will need to implement stringent inspection and decontamination protocols to mitigate the spread of invasive species. The situation underscores the broader ecological implications of geopolitical conflicts and highlights the need for coordinated international action to protect marine biodiversity in the face of unprecedented shipping disruptions.