While growing production of shale oil in the US could present a challenge to the international shipping market, it is boosting optimism in domestic wet trades.

Shipowners say the increasing movements of oil and products within the US markets are already contributing to an improving market.

“It’s pretty robust because of all the different crude plays,” said Bruce Richards, who heads the oceangoing-transport business at Jones Act tug and barge player Moran Towing.

“The