Active shark species like the mako and great white shark tend to swim closer to the surface because of their need for speed.

Thus, as fish get bigger, they have less gill surface area and their gills provide less oxygen per unit volume or weight," said Dr. Daniel Pauly, lead author of the study and principal ...

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

The genes that build the cartilage of fish gills were repurposed to build the cartilage in mammals’ outer ears. Skip to main content. Scientific American. January 22, 2025. 7 min read.

In tadpoles, both human ear and fish gill enhancers showed activity in their gills. In lizards, a related program was active in a small bone-like structure in their middle ears.

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.

It’s evolutionary biology.In a fascinating new discovery, scientists have found evidence suggesting that the flexible outer part of human ears may have evolved from the gills of ancient fish.

After they were swallowed, all but four of the eels tried to get out by going back through the fish’s digestive tract toward its esophagus and gills. Of those, 13 managed to get their tails out ...

Analysis of 33 fish species demonstrates that gill surface area is a primary determinant of oxygen uptake and growth in fish, consistent with the Gill Oxygen Limitation Theory.