Interior ministry spokesman Khlifa Chibani said 41 people aged between 13 and 19 were detained on Sunday amid fresh protests.
Tunisian authorities arrested another 150 people including local opposition leaders over unrest against price and tax rises that prompted troop deployments to restive towns, and activists called for renewed rallies at the weekend.
Protests erupted in more than 10 towns across Tunisia against price and tax increases imposed by the government to reduce a ballooning deficit and an economic crisis.
Tunisia suspended Emirates Airlines flights after a public outcry over security measures in the United Arab Emirates targeting women from the North African country.
A Tunisian police officer who was stabbed by a suspected militant died of his wounds on Thursday, and security unions threatened to stage protests if parliament fails to legislate tougher protections for security force personnel.
Tunisia's navy rescued almost 100 migrants from a sinking boat off its southeast coast late on Monday, authorities said, hours after eight people being smuggled to Europe drowned in the same stretch of water.
Slim Chaker, 56, fell ill after running some 500 metres and then making a speech at the start of a race in the coastal town of Nabeul aimed at raising funds to build a clinic for children with cancer.
Britain on Thursday applauded Tunisia's "patient hard work" to boost security following the 2015 jihadist attacks that killed dozens of tourists, including 30 Britons at a beach resort.