(AFP) - The Mauritius opposition appeared to be headed for victory in legislative elections after Prime Minister Pravind Jugnauth on Monday conceded defeat.

Final results have yet to be officially released, but opposition leader Navin Ramgoolam looked set to take over the post of prime minister for the third time at the head of his Alliance of Change coalition.

Jugnauth said his Lepep alliance, led by his Militant Socialist Movement (MSM), was "heading towards a big defeat" in Sunday's poll in the prosperous Indian Ocean island nation.

"The people have chosen another team to lead the country," Jugnauth, who has been prime minister since 2017, told reporters.

"We must respect this choice... and we wish the country and the population good luck."

Only last month, Jugnauth was celebrating a historic deal with Britain to regain sovereignty over the Chagos Islands following a long-running dispute.

But the campaign was overshadowed by an explosive wire-tapping scandal, when secretly recorded phone calls of politicians, diplomats and journalists were leaked online.

During a lively and sometimes heated campaign, both camps promised voters they would take measures to improve the lot of ordinary Mauritians who face cost-of-living difficulties despite strong economic growth.

Turnout in Sunday's vote was strong at about 80 percent, according to provisional estimates by the election commission.

- 'Waiting for liberation' -

Voters had voiced concern about the continued political and economic durability of one of the richest and most stable democracies in Africa.

Both Jugnauth and Ramgoolam are members of the dynasties that have dominated politics in Mauritius since it became independent from Britain in 1968.

Ramgoolam, 77, is the son of Seewoosagur Ramgoolam -- who led Mauritius to independence -- and served as prime minister between 1995 and 2000 and again from 2005 to 2014.

On Sunday, he had voiced optimism that his bloc would win.

"We are heading towards a big victory tomorrow. The people are waiting for this liberation," he told reporters.

Ramgoolam had warned about the risk of fraud, but later said voting went off largely without incident.

Sixty-two seats were up for grabs under a first-past-the-post system, with the remaining eight allocated under what is dubbed the "best loser" system.

The majority-Hindu nation has seen substantial stability and growth since independence, building an economy based on tourism as well as financial services and textile manufacturing.

Gross domestic product per capita in 2022 was more than $10,000, according to the World Bank. But analysts have highlighted growing concerns about governance and corruption.

The island is renowned for its spectacular palm-fringed white beaches and turquoise waters, attracting 1.3 million visitors last year.

The Chagos deal was a major success for the government, though Britain will retain a lease for a joint US military base on the island of Diego Garcia for an "initial" 99 years.

Jugnauth hailed it as the completion of the nation's "decolonisation".

© Agence France-Presse