The fishing vessel Wen Chun collided with the fishing vessel Guoji 909 off Nemuro, Hokkaido, Japan.  The Guoji 909 broke up and sank after the collision.   The 40 crewmen on the Guoji 909 were rescued by the Wen Chun.   No reports of injuries.   The Wen Chun is proceeding to a port on Hokkaido.