A boat with Japanese writing on it has washed up on the shoreline of Kahana Bay on Oahu and state officials are investigating whether it is debris from the Japanese tsunami. 

Mussels, not endemic to Hawaii, were found on the boat. 

From DLNR: 

The approximately 20-foot boat was reportedly seen floating whole on Thursday, November 29 in Kahana Bay. By Friday afternoon when it was officially reported, it had broken up into pieces on rocks on the northward outer edge of the bay. Staff from the Department of Land and Natural Resources (DLNR)  the State’s lead agency for marine debris responses, were able to retrieve pieces of the boat from the rocks and bring them ashore on Saturday. 

Further investigations by DLNR today in the ocean near where the boat had washed up on to the rocks recovered more pieces of the broken boat. Identification information found on the various pieces include Japanese characters (kanji) on a section of the bow,  and Japanese registration numbers from pieces of the stern. The NOAA Marine Debris Program in Hawai‘i is working with the Japan Consulate on confirmation of the boat’s origin.