An increase in Asian freight shipped straight to Mexico means fewer trucks heading south from the U.S., tighter capacity for northbound shipments.
Rise ends three consecutive weeks of decline.
A crackdown on existing inspection standards could reduce the number of vessels available to carry cargoes in U.S. domestic waterborne trade.
June 1 general rate increases make their presence felt on Asia-Europe.
Forwarders see little sign of a rate rebound in spot and contract rates on the trans-Atlantic.
Hyundai Merchant Marine has said its financial restructuring will allow it to acquire mega-ships.
Zim Integrated Shipping Services swung to a loss in the first quarter despite an increase in container volume.
The fleet of idled container ships has fallen to its lowest level since November 2015.
Maersk Line continues to outperform competitors.