Prefer Newsweek on Google to see more of our trusted coverage when you search. Before squaring up for a fight, some fish check themselves out in the mirror to make sure they're big enough. This ...

A collaborative team of scientists led by the University of Massachusetts Amherst recently found that there is no physiological evidence supporting a leading theory—which involves the surface area of ...

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The theory that water-breathing animals such as fish will shrink due to global warming has been called into question by a new study. The theory that water-breathing animals such as fish will shrink ...

Body mass and cell size are major factors in a fish’s ability to withstand temperature-dependent, low-oxygen environments. Fish worldwide are being plagued by larger and more frequent episodes of ...

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 ...