Several thousand fishermen blocked Bangladesh's busiest highway on Sunday, police said, as protests escalated over a two-month fishing ban in the Bay of Bengal. 

The fishermen say the 65-day blockade - intended to replenish fish stocks - is driving them out of business.

Their one-hour protest at the coastal town of Sitakunda caused several kilometers of tailbacks on the main road linking the capital, Dhaka, to the second city of Chittagong.

Local police chief Suman Banik said the demonstration by 3,000 fishermen and their families was peaceful "but it caused a huge traffic jam on this busy highway." The demonstrators only cleared the road after a government administrator and a local member of parliament promised to help.

The fishing ban runs from May 20 to July 23 and navy and coast guard vessels are patrolling the zone to prevent breaches.

Bangladesh frequently bans deep-sea fishing and catches in coastal rivers to help stocks, but this is the longest imposed for seas near the coast and fishing communities are furious.

About 15 million people in the region directly or indirectly depend on Bangladesh's ­multibillion dollar fishing industry. Shyamol Palit, an organizer of the demonstration, said the ban has hit poor fishermen hard, especially the Hindu Joldas community.

The ban has also hit the nearly 1 million Rohingya refugees who live in camps in Bangladesh after leaving Myanmar in recent years. The refugees are not officially allowed to work outside the camps, but thousands are secretly employed on trawlers owned by Bangladeshis.