On the night of August 3, the fishing vessel Ishikawa Maru capsized fishing boat in the Seto Inland Sea some 18 kilometers southeast of the southern tip of Cape Motoyama near Onoda City, Japan. The Ishikawa Maru had been fishing with 2 persons on board, the master of the vessel and his wife, when it was struck by another vessel during the night. The collision caused the  Ishikawa Maru to rollover and capsize sending both people on board into the water.

When the Ishikawa Maru had to arrived back to port at its usual time, a member of the fishing cooperative alerted authorities.  The Japanese Coast Guard launched a search and rescue operation in the area and found the captain clinging to the bottom of the overturn fishing vessel. He had sustained minor injuries. The Coast Guard also found his wife, but reports state she had perished.

The Japanese Coast Guard has launched an investigation into the incident. The incident is being classified as a hit-and-run. An inspection of the Ishikawa Maru hull show signs of collision marks.