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Extraordinary footage of a rarely seen giant deep sea fish has been captured by scientists.
Using a remotely operated vehicle, they caught a rare glimpse of the huge oarfish, perhaps the first sighting of the fish in its natural setting.

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Biologists have cast doubt on the long-held theory that fish gills evolved primarily for the purpose of breathing.
The researchers studied the development of gills in rainbow trout larvae.
Their experiment suggests that it is likely that fish evolved gills for the primary purpose of regulating the chemicals in their bodies.
The team reports in the Royal Society journal Proceedings B that this developmental study gives an insight into the evolution of fish gills.

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The deepest living fish ever spotted in the southern hemisphere have been caught on camera.
The bizarre-looking pink creatures, Notoliparis kermadecensis, were photographed at a depth of 7,560m, swimming in the Kermadec Trench off the coast of New Zealand.

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Devon river team's piranha shock
A "killer" fish native to South America has been found in a Devon river.
The Environment Agency said its staff were amazed to finding a dead piranha in the East Okement tributary of the River Torridge.

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Common fish species has 'human' ability to learn
Although worlds apart, the way fish learn could be closer to humans' way of thinking than previously believed, research suggests.
A common species of fish which is found across Europe including the UK, called the nine-spined stickleback, could be the first animal shown to exhibit an important human social learning strategy. The sticklebacks can compare the behaviour of other sticklebacks with their own experience and make choices that lead to better food supplies, according to the study by St Andrews and Durham universities.

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