VLCC spot rates have slumped as much as 20% in a week due to sluggish June bookings.
Clarksons Securities assesses eco vessels down to $45,400 per day, a 6.5% fall from Tuesday and off 18% in a week.
Older VLCCs are averaging $37,800 per day, down 8% in 24 hours and more than 20% in the past seven days.