Experts say some North Korean fishermen travel far out to sea in order to satisfy government mandates for bigger catches.
Satoru Miyamoto, a professor at Seigakuin University and expert on North Korea told CNN: "It's after Kim Jong Un made a decision to expand the fisheries industry as a way of increasing revenue for the military".
A wooden boat, which according to a police official carried eight men who said they were from North Korea and appear to be fishermen whose vessel ran into trouble, is seen near a breakwater in Yurihonjo, Akita Prefecture, Japan November 24, 2017.
'They are using old boats manned by the military, by people who have no knowledge about fishing.
Two further bodies were found in separate places on the edge of the surf on Sado isand, which lies 450 miles from North Korea. Experts believed they were either bodies of defectors or fisherman who had been forced to search for food in risky waters amid North Korean food shortages. It is the latest discovery of an unidentified boat washed ashore on the Japanese coast in a string of similar recent cases. Authorities now believe that the ship may have come from North Korea, and its unfortunate crew is thought to have been defectors fleeing the troubled country in search of a new life elsewhere.
About 30,000 North Koreans have defected since the devastating starvation in the mid-90s.
Satoru Miyamoto, a professor at Seigakuin University, explained the number of these kind of ships finding their way to Japanese shores had risen since 2013.
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Japan recently increased its defences against Kim Jong-un's deadly nuclear arsenal.
"It is a vicious cycle that is hard to stop in North Korea".
High waves had prevented officials from investigating since the boat was first spotted on Friday, they said.
"Everyone was hungry, even the soldiers", he said.
North Korea suffered a devastating starvation in the 1990s which killed as many as 1 million people, and the United Nations estimates as much as 70% of the country's 25 million people still don't eat a "sufficiently diverse diet".