There are grave fears for two Australians who were on board a livestock ship that has capsized in stormy weather in the East China Sea.
The pair, understood to be a vet and a stockhandler, were among 43 crew on board the Jordanian vessel Gulf Livestock 1 which was en route to China from New Zealand.
The one seaman to be rescued so far, a Filipino, said the boat had capsized.
The Department of Foreign and Affairs is assisting the families of the Australians.
"The Australian government is providing consular assistance to the families of two Australian crew members on board a cargo vessel reported missing in Japanese waters," a DFAT spokesperson told SBS News on Thursday.
"Owing to our privacy obligations we are unable to provide further comment," they said.
The ship sent a distress call from west of Amami Oshima island in southwestern Japan on Wednesday as the region experienced strong winds, heavy seas and drenching rains from Typhoon Maysak as it headed towards the Korean peninsula.
The Gulf Livestock 1 ship is missing off the coast of Japan after strong winds from typhoon Maysak lashed the region. Source: Supplied
The ship sent a distress call from west of Amami Oshima island in southwestern Japan on Wednesday as the region experienced strong winds, heavy seas and drenching rains from Typhoon Maysak as it headed towards the Korean peninsula.
An industry source told AAP the shipment was a New Zealand consignment which would fall under their regulatory authorities.
The shipment is believed to have been put together by Australasian Global Exports, a Melbourne-based exporter which operates across Australia and New Zealand. It's understood the company has been contacting the families of the Australians.
Australasian Global Exports executive procurement director Graeme Turner declined to comment.
The exporter is believed to be responsible for employing stockhandlers and vets, with the shipping company employing the crew.
Japan's coastguard said it rescued 45-year-old chief officer Sareno Edvarodo on Wednesday night while searching for the ship.
According to Mr Edvarodo, the vessel lost an engine before it was hit by a wave and capsized, a coastguard spokeswoman said.
Typhoon Maysak over South Korea. Source: NASA
When the ship capsized, crew were instructed to put on life jackets. Mr Edvarodo said he jumped into the water and did not see any other crew before he was rescued.
The vessel departed Napier in New Zealand on 14 August and was bound for the Chinese port of Jingtang, carrying 5867 cattle.
Its journey was expected to take about 17 days.
Japan's coastguard said the 43 people on board also included 39 from the Philippines and two from New Zealand.
New Zealand's foreign ministry is providing consular assistance to the families of the New Zealanders.
