The researchers studied tissue from over 120 fish. They found that 50 to 60 percent of their diet came from ocean’s twilight zone sources. Bigeye tuna showed the most consistent deep-sea reliance.

MIT oceanographers discovered big fish like tuna and swordfish get a large fraction of their food from the ocean’s twilight zone — a cold, dark layer about half a mile below the surface.

The ocean holds many bizarre deep-sea monsters ... Down here, we enter the midnight zone, where no natural light can reach. You might also pass Tiburonia granrojo, or 'Big Red', one of the ...

The open ocean’s twilight zone, a vast deep ecosystem rich in fish biomass ... In 2022, one of the students attending a 10-week-long undergraduate field course at the reserve wondered how ...

For some of the ... long-distance dives. MIT oceanographers have found that big fish like tuna and swordfish get a large fraction of their food from the ocean's twilight zone—a cold and dark ...

Picture an ocean world ... the twilight zone and the midnight zone, where strange and delicate animals thrive in the near absence of sunlight. Whales and commercially valuable fish such as tuna ...

Picture an ocean world ... the twilight zone and the midnight zone, where strange and delicate animals thrive in the near absence of sunlight. Whales and commercially valuable fish such as tuna ...