Phang Nga residents have been advised to only pick adult snails to preserve the ecosystem of the sea.
Anuwat Waiwong, a local resident, said tower shells can be sold at between Bt25 and Bt30 per kilogram and vendors can make as much as Bt1,000 a day.
Tower shells are a mainstay in most eateries in the South as they are delicious and fun to eat.