The DMK leader, who was kept in a marriage hall, along with over 100 party workers was released in the evening and left for Chennai by flight, police said.
Earlier speaking to reporters, Stalin alleged "rampant corruption" in the desilting of lakes in the state and said the party would soon release a list of Ministers "involved in corruption."
"The party has a list of ministers involved in the corruption and will soon release their names," he said.
Stating that his "preventive" arrest was a victory for DMK, as the ruling party feared a backlash from the public, Stalin said Chief Minister K Palaniswami and some other state ministers were "prostrating" before the Prime Minister and other ministers for getting NEET exemption for Tamil Nadu.
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"What transpired during the meetings, nobody knows," he said, adding that his party was on a mission to desilt lakes across the state for storing water.
Stalin claimed that the police denied him permission to visit Salem to participate in the human chain protest seeking exemption for the state from NEET.
Though there was no ban on him visiting the lake, police barred him from going there as well, citing law and order problem, he said.
Meanwhile, around 3,000 workers, including 600 women, of various political parties participated in a human chain in the city seeking exemption to Tamil Nadu from NEET, police said.
"This is nothing but an effort to defame DMK, which with the support of other parties has taken up the students' cause over NEET and is organising the human chain," he alleged.
DMK workers said they had desilted part of the lake and strengthened its bunds together with some farmers.
However, farmers belonging to ruling AIADMK had removed the silt by using earth-movers, resulting in damage to the bunds, they had alleged.
Workers of the rival parties had on July 25 clashed over the issue, forcing the administration to stop the desilting work for a day.
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