Only six ships crossed in 24 hours, far below the 125-140 daily passages seen before the Iran war began on 28 February.
Traffic has averaged about seven vessels a day, mainly dry bulk carriers using Iranian waters, while one transit included the US-sanctioned chemical tanker Vast Plus.
The slowdown persists despite an 8 April ceasefire, as US-Iran talks remain deadlocked and Washington warns any payments to Iran for passage could trigger sanctions, including for non-US firms.
Could Iran's controversial shipping toll permanently reshape control over the world's most vital waterways?
As the US and Iran trade threats over the Hormuz strait, how close is the world to another war?
With oil prices surging, is the Strait of Hormuz deadlock about to trigger a global recession?