The shrinking size of Alaska salmon, a decades-long trend linked in part to warming conditions in the ocean, is hampering the ability of chinook in Alaska’s two biggest rivers to produce new ...

Before squaring up for a fight, some fish check themselves out in the mirror to make sure they're big enough. This strange behavior was seen in bluestreak cleaner wrasse (Labroides dimidiatus), who ...

Timothy Clark receives funding from the Australian Research Council and Deakin University. Fish are the most diverse group of vertebrates, ranging from tiny gobies and zebrafish to gigantic tunas and ...

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 ...

Catching the biggest fish usually comes with the biggest bragging rights, but now a new breed of anglers working to hook those at the other end of the spectrum. The catch might not be as big, the ...

Before deciding whether or not to fight another fish, cleaner wrasse check their own reflection in a mirror and size themselves up. First, Taiga Kobayashi at Osaka Metropolitan University in Japan and ...

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 ...