District Fisheries Officer Asadul Baki said they also seized nearly 2.5 maunds of hilsa and 600,000 metres of Current Jal during their drive.
A 22-day ban on catching, selling, hoarding and transporting hilsa came into effect from October 14 to protect hilsa with eggs. The ban is effective until November 4.
This is the peak period when hilsas release eggs.
Hilsa has the highest contribution in the country's fish production, the government says. It contributes to more than 12.09 percent to the country's fish production.
In 2017-18, hilsa production was 5.17 lakh MT, which had an estimated value of around Tk 20,680 crore. This year, the authorities concerned set a target to produce 5.5 lakh MT hilsa.
Earlier, the two-month government ban on catching, selling and transporting of hilsa began on March 1 and ended May 1.
Also read: 22-day Hilsa ban begins Oct 14