Unicorn fish

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(Zool.) the narwhal.

See also: Unicorn

References in periodicals archive ?
As the surgeon fish darts off, a sleek unicorn fish visits the cleaner's station.
As the wrasse cleans, the color of the unicorn fish changes to a glowing pale blue.
About 205 different species thrive in the crater, including the colorful parrot, butterfly and unicorn fish.
It's nice to be in a living aquarium again, with big coral walls and bommies (coral heads) and canyons littered with fish: There are purple starfish and cushion-like sea cucumbers, trigger, trumpet, red emperor and unicorn fish, and lots of bright juvenile fry hugging the reef for protection.