Fish gills are shaped like a heart. Not moving water back and forth, as we do with the air we breathe, saves fish considerable energy. The average fish uses muscles to pump water into its mouth and ...

I think the gills allow fish to breathe because water goes in them. Because they have holes in their gills so it is like a nose. But I don’t know how they stay alive if we can’t with our nose. Well if ...

A collaborative team of scientists recently found that there is no physiological evidence supporting a leading theory -- which involves the surface area of fish gills -- as to why many fish species ...

Fish induce production of a particular antibody in their gills in response to pathogen exposure, researchers report at the conclusion of work that could lead to improved fish vaccines for aquaculture.

A widely debated topic in biology and fisheries sciences is the role of oxygen in the growth of fish and other water-breathing animals. According to new research, developmental changes in individual ...