Ian Urbina, investigative reporter, has written a book and published articles describing a fleet of 800 industrial fish boats from china who are illegally poaching catch from North Korea waters ... fallout is a devastating drop in squid partly due to these chinese boats catching squid as they migrate to their spawning grounds ( caught before they breed ) which is extremely short sighted and illegal ... also hundreds of ghost fishing boats from North Korea washing up on Japanese shores with dead crew ... I suggest you read up on Ian Urbina's work