"Less sulfur means more bugs," Taylor said.

Russia's plan to delay the introduction of a low sulfur cap on marine fuel used by its river fleet is not expected to impact the country's fuel oil market.

A US House of Representatives panel Tuesday considered requiring the Environmental Protection Agency to disclose details of small refineries' requests for exemption from the federal biofuel mandate.

Russia proposes to hold off a tougher international sulfur cap on marine fuel emissions until 2024 for river vessels in the Eurasian Economic Union