Many fish that eat zooplankton see UV light. In saltwater, biologists have found that pink, chum, coho, sockeye, and masu salmon detect UV light. Weakfish and flounder also detect UV light.

In freshwater, biologists found that brown and rainbow trout, kokanee, yellow perch, white suckers, carp, bluegill, and pumpkinseed sunfish detect UV light. Largemouth and smallmouth bass – members of the sunfish family – may also see UV light. Many fish species have yet to be tested to determine if they detect UV light.