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**"Pioneer of Marine Biology"**
Deep-sea fish is a general term for fish that typically inhabit waters deeper than 200 meters. As of 2023, the deepest recorded observation of living fish by photography is 8,336 meters (in the Izu-Ogasawara Trench of the Western Pacific Ocean).
It is estimated that at least 2,000 of the approximately 15,800 species of marine fish are deep-sea fish. Deep-sea fish are broadly categorized into benthic deep-sea fish, which live near the seabed, and pelagic (drifting) deep-sea fish, which inhabit the midwater column away from the seabed, with an estimated roughly equal number of species in each category.
In the deep sea, where sunlight cannot penetrate, there are no photosynthetic plants (seagrasses, seaweeds, or phytoplankton). Therefore, the foundation of the deep-sea food web is sustained by shallow-water flora and fauna. The remains and excretions of organisms not consumed in shallow waters descend as marine snow, eventually accumulating in the deep sea. This sinking organic matter is consumed by pelagic deep-sea organisms such as krill and jellyfish, and once it settles on the deep seabed, it serves as an energy source for benthic organisms like shellfish, sea cucumbers, and brittle stars.
To adapt to this extreme environment, deep-sea fish have developed specialized body structures and lifestyles not found in shallow-water fish. Research into deep-sea fish plays a significant role in understanding the deep-sea environment, which constitutes the Earth's largest biosphere, and the biodiversity that thrives within it.
**Q&A**
Q: What was this person's contribution?
They brought the existence of "deep-sea fish" to public awareness and contributed to the advancement of modern oceanography through their research and development.
Q: What are their famous works?
The unique body structures and lifestyles of deep-sea fish play a crucial role in understanding the deep-sea environment, which is the largest biosphere on Earth.
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・[Feb. 1, 2026 Deep Sea Research Super Kids Research Presentation] The Potential of Deep-Sea Fish Snailfish: The Potential of Pliant Material
・Deep-Sea Fish Direct Delivery ~From Deep-Sea Fish to Your Home Table~ (Togaribito Episode 8)
English Summary
**"Pioneer of Marine Biology"**
Deep-sea fish is a general term that generally refers to fish that live in waters deeper than 200 meters. As of 2023, the deepest recorded depth at which living fish were photographed is 8,336 meters (Izu-Ogasawara Trench in the Western Pacific Ocean).
It is estimated that at least 2,000 of the approximately 15,800 species of saltwater fish fall under the category of deep-sea fish. Deep-sea fish are broadly divided into benthic deep-sea fish, which live near the ocean floor, and swimming (drifting) deep-sea fish, which live off the ocean floor and drift in the middle layer, and it is estimated that the number of species in each category is approximately the same.
Because there are no plants that perform photosynthesis (seaweed, algae, and phytoplankton) in the deep sea, where sunlight does not reach, it is shallow sea animals and plants that support the food chain in the deep sea. The remains and excrement of creatures that are not consumed in the shallow sea settle as marine snow, which eventually accumulates in the deep sea. This sinking organic matter is consumed by planktonic deep-sea organisms such as krill and jellyfish, and after being deposited on the deep sea floor, it is used as an energy source by benthic organisms such as shellfish, sea cucumbers, and spider stars.
In order to adapt to this extreme environment, deep-sea fish have acquired special body structures and lifestyles that are not found in shallow-sea fish. Deep-sea fish research plays a major role in understanding the deep-sea environment, which makes up the largest biosphere on Earth, and the biodiversity that exists there.
**Q&A**
Q: What did you do?
He informed the world of the existence of "deep sea fish" and contributed to the advancement of modern oceanography through research and development.
Q: What are your famous works?
The special body structures and lifestyles of deep-sea fish play an important role in understanding the environment of the deep sea, the largest biosphere on Earth.
Wikipedia: Deep-sea fish
