Vessel transits at the Strait of Hormuz fell slightly on Wednesday to seven, compared with the previous day's 12, preliminary shiptracking data showed on Thursday, with levels also lower than the 10-day average of 14.
Some vessels could be sailing through the waterway with their transponders turned off and these are not considered in the counts.
Of the exits, one was a very large crude carrier - Finland Prosperity - carrying nearly 2 million barrels of crude.
No tankers carrying liquefied natural gas exited the strait.
The remaining three exits were made by two dry bulk carriers and a short-range dirty products tanker.
Meanwhile, of the three ships that entered, one was a dry bulk carrier and the other two were a short-range tanker and a medium-range-sized tanker.
At the Bab el-Mandeb Strait, some 28 commodity ships transited on Wednesday, a level similar to the 10-day average of 27.
Of the total, 16 ships entered and 12 exited.
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