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Image number: 2409060

Four-eyed fish, Anableps anableps, eye detail. Four-eyed fish have only two eyes, but the eyes are specially adapted for their surface-dwelling lifestyle. The eyes are positioned on the top of the head, and the fish floats at the water surface with only the lower half of each eye underwater. The two halves are divided by a band of tissue and the eye has two pupils, connected by part of the iris. The upper half of the eye is adapted for vision in air, the lower half for vision in water. The lens of the eye also changes in thickness top to bottom to account for the difference in the refractive indices of air versus water. Four-eyed fish spend most of their time at the surface of the water. Their diet mostly consists of terrestrial insects which are readily available at the surface. Aquarium, Portugal

© Paulo de Oliveira / Biosphoto

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Les poissons à quatre yeux n'ont que deux yeux, mais ils sont spécialement adaptés à leur mode de vie vivant en surface. Les yeux sont placés sur le dessus de la tête et le poisson flotte à la surface de l'eau, seule la moitié inférieure de chaque œil étant sous l'eau. Les deux moitiés sont divisées par une bande de tissu et l'œil a deux pupilles, reliées par une partie de l'iris. La moitié supérieure de l'œil est adaptée à la vision dans l'air, la moitié inférieure à la vision dans l'eau. Le cristallin de l’œil change également d’épaisseur de haut en bas pour tenir compte de la différence des indices de réfraction air-eau. Les poissons à quatre yeux passent le plus clair de leur temps à la surface de l'eau. Leur régime alimentaire consiste principalement en insectes terrestres qui sont facilement disponibles à la surface.

Keywords

Wild animal / Fish (animal) / Osteichthyes / Actinopterygii / Foureyed fish (Anableps sp) / Largescale four-eyed fish(Anableps anableps)

Species / Species particularity / Fishes particularity / Euryhaline fish

Natural resources use / Fauna use / Captive animal / Aquarium / Freshwater aquarium

Organism / Anatomy / Organ / Physiological system / Sensory system / Eye

Shot / Close-up

Shot / Split view

Species / Species particularity / Fishes particularity / Freshwater fish / Tropical freshwater fish

Organism / Morphology / Morphological adaptation

Species / Species particularity / Fishes particularity / Brackish water fish

Latin keywords

Eukaryota / Opisthokonta / Metazoa / Bilateria / Coelomata / Deuterostomia / Chordata / Vertebrata / Pisces / Osteichthya / Actinopterygii / Teleostei / Cyprinodontiformes / Anablepidae / Anableps

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