Two people from the Chinese fishing vessel which sank in the central Indian Ocean were confirmed dead while China appreciated the help from a host of countries in the region including India for responding to its call for search and rescue operations for the remaining 37 missing sailors.

Two people were confirmed dead after a Chinese deep-sea fishing vessel Lupeng Yuanyu 028 capsized in the Indian Ocean on Tuesday, China’s Ministry of Transport said on Thursday.

So far 10 vessels, including three Chinese navy ships and one foreign ship, are carrying out on-site search and rescue work, and more ships will arrive, the ministry said, state-run Xinhua news agency reported.

The capsized vessel, Lupeng Yuanyu 028, had 39 people on board, which include 17 Chinese mariners, 17 Indonesian mariners and five Philippine mariners.

"Truly appreciate the timely help", the Chinese embassy in India tweeted sighting the Indian Navy’s statement.

Chinese Foreign Ministry spokesman Wang Wenbin told the media here on Thursday that "as we speak, the search and rescue operation is still underway".

He said the rescue operation has drawn close attention from across the region.

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Countries such as Australia, India, Sri Lanka, Indonesia, the Maldives and the Philippines have extended emergency assistance and sent sympathies for the Chinese boat and crew, he said, providing an update about the search operations.

The operation has been commended from various quarters in China and abroad. "The Chinese government sincerely appreciates the help from those countries", he said.

In New Delhi, the Indian Navy said it deployed a P-8I maritime patrol aircraft to help in the search and rescue of a Chinese fishing vessel.

The P-8I aircraft carried out multiple and extensive searches on Wednesday despite adverse weather and located multiple objects possibly belonging to the sunken vessel, the Navy said.

"In a display of India’s obligations as a credible and responsible partner for ensuring safety at sea, the Indian Navy units also coordinated search and rescue efforts with other units in the area and guided the PLA Navy warships transiting to the scene of the incident," the Indian Navy said.

A spokesperson for the Australian Maritime Safety Authority (AMSA) told Xinhua on Thursday that based on drift modelling, a remote 12,000 square km zone has been identified to search for the vessel.

The spokesperson said that they continued to coordinate a multinational search effort after a distress beacon signal was received by AMSA from the fishing vessel at about 5.30 am (AEST) on the morning of May 16.

AMSA requested assistance from the Australian Defence Force (ADF). An ADF P-8A Poseidon aircraft was tasked with assisting with the long-range search.

A private charter aircraft from Perth, with State Emergency Service (SES) observers on board, also assisted with the search on Wednesday and will rejoin the search on Thursday.

"A number of merchant ships and other vessels have been assisting with the search and will continue to do so today. AMSA would like to thank these vessels and their crews for their invaluable assistance," the spokesperson said on Thursday.

"Australia has been liaising with the Chinese Maritime Rescue Coordination Centre (MRCC), with three Chinese naval ships continuing the search in the area today," the spokesperson said.

Officials said weather conditions have calmed significantly since Tuesday. Four vessels, including two foreign ships, are undertaking on-site search work.

AMSA said it is also working with the China Meteorological Administration to predict the drift of the missing crew, and it is enhancing its coordination with search and rescue agencies in Australia, the Maldives and Sri Lanka.

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