Researchers have elucidated how a single photoreceptor in the pineal gland of zebrafish detects color. We see color because photoreceptor cones in our eyes detect light waves corresponding to red, ...

There’s nothing better than a vibrant pre-spawn color shift – but it’s not the only reason trout change colors. A healthy small-stream brook trout. / Photo by Jasper Taback If you were to follow a ...

From spots to stripes to dazzling colors, these fish have captured our hearts with their good looks. These five made our list of the prettiest fish in fresh water. / Ken Baldwin If you asked people ...