Part of a fiberglass boat spotted floating off the coast of Oregon is thought to be more debris from the 2011 Japanese tsunami. The 25-ft long wreckage was discovered floating west of Ona Beach in Lincoln County at about 9.30am on Thursday. Biologists with the Oregon Coast Aquarium and Oregon State University's Hatfield Marine Science Center inspected the boat remains and and found 'several live specimens of a variety of yellowtail jack fish found in the coastal waters of Japan.' Tsunami debris: A chunk of a fiberglass boat 25-30' long has been spotted floating off the Oregon shore . Rescued: These live yellowtail jack fish, native to Japan, were found inside the floating debris and are now being housed in the Oregon Coast Aquarium . The several live yellowtail jack fish found on board will be delivered to the Oregon Coast Aquarium. Five million tons of wreckage - the remains of homes, boats, and other remnants of shattered lives in eastern Japan - were swallowed by the ocean when the tsunami struck four years ago. About 70 per cent of it sank, leaving about 1.5 million tons floating with scientists saying they expect more debris to hit Alaska and the West Coast of North America for years to come. An estimated 5 million tons of debris washed into the ocean in March of 2011 during the tsunami. Around 70 percent of it is believed to have immediately sunk near the Japanese coast. Some more mobile items may have reached the Pacific Northwest before 2011 even came to a close. The first documented piece of debris to arrive in California, a barnacle covered fishing boat, came ashore in April 2013. The particles are dispersed sparsely from Alaska to the Philippines. In 2013, a floating island of debris the size of Texas crossed the vast Pacific Ocean to the western shores of the Americas. The Oregan authorities plan to tow the boat segment to the Port of Newport for temporary storage. 'The debris appears to be half to two-thirds of a larger vessel, possibly damaged and set adrift during the earthquake and tsunami that struck the east coast of Japan in 2011,' said Chris Havel of the Oregon Parks and Recreation Department. He said biologists inspected the object and consulted with the state Fish and Wildlife Department, deciding that the attached organisms pose little threat to the Oregon coast ecosystem. The remains of the boat will eventually be removed from the water, studied, dismantled and taken to a landfill. Wreckage: The fiberglass remains of the boat found floating off the coast of Oregon yesterday . Wreckage: A floating island of debris the size of Texas floated toward California coast in 2013 after washing into the Pacific in Japan's horrific 2011 tsunami . Ghost ship: The 164ft Japanese fishing vessel Ryou-Un Maru entered US waters March 31, 2012, on its ghostly journey after being washed away by the massive wave. The ship eventually sank in the Gulf of Alaska .
Japanese species of fish found inside the remains of floating vessel .
Latest of one million tons of debris dispersed in the Pacific by tsunami .
Oregon authorities plan to tow the 25-ft piece of fiberglass .
18,000 died in the disaster with waves reaching 128-ft above sea level .