Definition of four-eyed fish in US English:

four-eyed fish

noun

  • A small livebearing freshwater fish of tropical America. Each eye is divided into two, allowing the fish to see both above and below the water while swimming at the surface.

    Family Anablepidae and genus Anableps: several species

    • ‘Anableps anableps, a curious toothed carp of Central and South American rivers, is called the four-eyed fish, because its eyes are adapted to enable it to see above and below the water surface simultaneously.’
    • ‘This complex eye lens can focus two images simultaneously from above and below the water so it is called a four-eyed fish.’
    • ‘The four-eyed fish (family Anablepidae) has hourglass-shaped pupils that lie at the waterline.’
    • ‘One of the strangest fish in the world is Anableps anableps, commonly called the ‘four-eyed fish’ because of the unique configuration of its eyes.’
    • ‘Anableps tetrophthalmus, the four-eyed fish, inhabits the rivers of Mexico and northern South America.’
    • ‘Anableps, the four-eyed fish, frequents the rivers and estuaries from southern Mexico to northern South America.’
    • ‘In terms of aquarium care, four-eyed fish are quite demanding.’
    • ‘At the World Fish House located next to the Fish Live Theater, you can see many rare fish from around the world, including the beluga sturgeon, four-eyed fish, and lungfish.’
    • ‘A shoal of baby four-eyed fish are among the latest attractions at Portsmouth.’
    • ‘To take advantage of this capability, the four-eyed fish spends much of its time swimming at the water's surface, with the aerial corneas of its eyes protruding out of the water.’
    • ‘As well as the crabs, there will be other animals typically found in mangrove habitats, such as mudskippers and four-eyed fish.’