Izu-Ogasawara Trench and the Finding of the Deepest Fish

April 6, 2023

The Izu–Ogasawara Trench is an oceanic trench located in the western Pacific Ocean. It is known for being one of the deepest points in the world’s oceans. Here, the deepest ever fish was filmed, breaking the previous record of filming a fish swimming in the Mariana Trench.

Depth and Location

The Izu–Ogasawara Trench is also known as the Izu–Bonin Trench. It is some 9,780 meters (32,087 feet) deep. This oceanic trench is an extension of the Japan Trench and is composed of two trenches: the Izu Trench, located in the north, and the Bonin Trench, located in the south, west of the Ogasawara Plateau.

The Izu–Ogasawara Trench is located in the western Pacific Ocean, southeast of Japan. It runs parallel to the Mariana Trench, which is the deepest point in the world’s oceans at approximately 10,935 meters (35,876 feet) deep.

Marine Life in the Trench

Despite the extreme depths of the Izu–Ogasawara Trench, unique marine life has been found in this region. In 2019, the Minderoo-UWA Deep Sea Research Centre led a two-month expedition to explore the trench’s depths. During the expedition, the deepest fish ever caught on camera was filmed swimming at a depth of 8,336 meters (27,373 feet) in the trench. This juvenile snail fish is one of only two fish that have been collected from a depth greater than 8,000 meters.

The slightly warmer water in the Izu–Ogasawara Trench is believed to be responsible for the survival of fish at such extreme depths. Scientists have also discovered other unique marine life forms in the trench, including the Xenophyophore Occultammina, which was first discovered at a depth of 8,260 meters (27,100 feet).

Significance of the Trench

The Izu–Bonin–Mariana Arc system, which includes the Izu and Bonin Islands, is created by the subduction of the Pacific Plate beneath the Philippine Sea Plate in the Izu–Ogasawara Trench. This process is responsible for creating the unique geological features and marine life in the region.

The Izu–Ogasawara Trench is also significant for its research potential. Professor Jamieson, the founder of the Minderoo-UWA Deep Sea Research Centre, led the expedition to the trench in 2019 to study the effects of extreme ocean depths on marine life. The research conducted in this trench can help us understand more about the ocean’s depths and the unique ecosystems that exist in these extreme environments.

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