Overview
- More than 1,500 commercial vessels have sat idle in the Strait of Hormuz and adjacent Gulf waters since the trade route closed on Feb. 28, 2026, creating months of hull exposure that scientists say is unprecedented.
- Marine microbes, algae, barnacles and other invertebrates colonize idle hulls quickly and can enter a rapid growth phase after about 10 days, while antifouling coatings degrade during extended immersion.
- Organisms native to the Persian Gulf are adapted to extreme heat and salinity, traits that raise their odds of surviving transport and establishing in similar ports such as those in India and Southeast Asia.
- An international team led by UMCES published a peer‑reviewed assessment that urges in‑water cleaning, biofouling surveys, route forecasting and stepped-up port surveillance, but notes cleaning capacity, safety and disposal challenges and no coordinated global remediation effort to date.
- If unchecked, researchers warn the biofouling load could harm fisheries, aquaculture and coastal infrastructure and introduce pathogens, so ports, ship operators and regulators should prioritize fast detection, targeted cleaning and tracking of ship routes to limit spread.