The ban will remain in force till April 30.
When contacted, Chandpur District Fisheries Officer Shafiqur Rahman said that the ban covers an area of 100km from Shatnol under Matlab North upazila up to Char Alexander in Lakshmipur via sadar and Haimchar upazilas of the district.
Meanwhile, the Department of Fisheries has already conducted a massive campaign, including pasting posters and hanging banners, and is holding discussions with fishermen and the authorities concerned to make the ban fruitful.
The government has taken an initiative to allocate rice among the fishermen who remain jobless during the period.
This year, there are 41,189 registered and cardholding fishermen in Sadar, Haimchar and Matlab North upazilas of Chandpur.
Each fisherman will get 40kg rice per month per head during this ban period for their survival, Shafiqur said.
A requisition for allocating 6,590.24 tonnes of rice was sent to the higher authorities, he said.
Deputy Commissioner of Chandpur Abdus Sabur Mandal said that legal actions would be taken for catching fish defying the ban.