Not to us humans perhaps, but fish have additional patterning that's only visible under UV light, so UV light might make up an important part of their vision.

Not to us humans perhaps, but fish have additional patterning that's only visible under UV light, so UV light might make up an important part of their vision. https://royalsocietypublishing.org/cms/asset/33efdea2-5b7b-4db1-ac08-a6322cf6c301/rspb20141211f03.jpg https://royalsocietypublishing.org/cms/asset/33efdea2-5b7b-4... https://en.wikipedia.org/wiki/Vision_in_fish#Ultraviolet https://en.wikipedia.org/wiki/Vision_in_fish#Ultraviolet