Less than half of the oil production in the U.S. Gulf of Mexico's federal waters remained shut Wednesday as producers continue to restart operations following Hurricane Isaac.

The Bureau of Safety and Environmental Enforcement, which oversees offshore oil and natural-gas production, reported that 49.33% of oil output in the Gulf was still shut in-or about 680,749 barrels a day. That is compared to 51.5% of Gulf oil production that was shut in on Tuesday.

The bureau reported that 25.71% of natural-gas production in the Gulf, about 1.16 billion cubic feet a day, was still shut in.