Underlining the importance of defence cooperation between the two countries, Pillay said India's assistance to island country is "absolutely immeasurable".
He said the Seychelles has exclusive economic zone (EEZ) spread over nearly 1.3 million sq kms and there are reported cases of illegal fishing.
"So, you need surveillance. One of the big areas of cooperation with India is maritime surveillance and training (of the Seychellois armed forces). It is of enormous assistance," Pillay said.
Indian Coast Guard and Navy ships, while on surveillance, also undertake reconnaissance activities in Seychelles EEZ.
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India has gifted patrolling ships and interceptor boats to the Seychelles in the past.
In 2015, Prime Minister Narendra Modi inaugurated eight Coastal Surveillance Radar Systems (CSRS) set up by India during visit to the nation.
The two sides also signed an MoU on hydrography following which INS Darshak visited Seychelles from November to December 2015 to conduct hydrographic survey of Victoria Port and adjoining areas.
The Speaker of the Seychellois National Assembly said India has been a friend of Seychelles from beginning.
"The cooperation that has been with India has been absolutely immeasurable," he noted.