When a fish opens its mouth, the flap closes, drawing water into the mouth. As the fish closes its mouth, the flap opens. Oxygen is extracted from the water as it passes over the gills.

The fish's blood pH initially fell by 1.2 units, but after just a few hours their gills were able to correct this by bringing in bicarbonate ions from the surrounding water.

In tadpoles, both human ear and fish gill enhancers showed activity in their gills. In lizards, a related program was active ...

Freshwater fish take up chemicals from the surrounding water through their gills Biologists have cast doubt on the long-held theory that fish gills evolved primarily for the purpose of breathing. The ...

Scientists believe human limbs evolved from the gills of sharks - thanks to a gene named after Sonic the Hedgehog. The discovery comes from analysis of skate, a cartilaginous fish which has much ...

This fish, called Metaspriggina, doesn’t look like a game-changer, but it’s the first step towards modernity.Metaspriggina, which emerged 505 million years ago, has all sort of wild ...

Humans' outer ears may have evolved from the gills of prehistoric fish, a new study finds. Gene-editing experiments indicate ...

After being swallowed alive, Japanese eels were able to escape from a predator fish’s stomach and swim to freedom through the fish’s gills, new research shows.

Scientists have traced the evolutionary origin of humans' outer ears to the gills of ancient fish through a series of gene-editing experiments. News Today's news ...