- Scientific name: Anableps anableps
- Synonyms: Anableps anonymus, A. gronovii, A. lineatus, A. surinamensis, A. tetrophthalmus, Cobitis anableps
- Common name: Four-eyed fish
- Group: Livebearers
- Habitat: Coastal areas in Central and South America, from Venezuela to Brazil
- Size: 30 cm
- Biotope: In brackish and fresh waters, usually in the mouths of rivers.
- Social behavior: A surface-loving , peaceful, schooling livebearer but will eat fish that are small enough to fit into their mouths.
- Diet: Carnivorous; live foods as insects; they will eat frozen food, and will accept flakes.
- Breeding: Quite easy, but only in salt water!
- Tank: Minimum 250 litres
- Population: 5-6 fishes for 250 litres
- Decoration: Does best in a shallow tank: 8-11" (20-30 cm), with warm, brackish water. Needs a fine gravel bottom with brackish water plants as background and adequate swimming space. Since four-eyed fishes are excellent jumpers, the tank must be covered.
- Temperature: 24-28 °C
- pH: 7.5-8.5
- Hardness: 8-25 NK°
- Lifespan: 6 years
Description: The body of the fish is long and cylindrical, while the head is flat. The back is flat and the dorsal fin is small and set far back on the back. The color of the back is olive to gray and the flanks are gray-yellow to white with a violet to white iridescence under some lights. The cornea pupil and retina are divided by a horizontal strip, a constriction of the conjunctiva. The eyes project forward and there are distinctive upper and lower eye parts, hence the common name. The two upper portions project from the water and are used chiefly to locate enemies. The lower segments provides vision beneath the surface. Fish are mature at about 8 months, when the fish measure 6-8" (15-20 cm). Since the male gonopodium is rather infelxible, moving only to one side, conception occurs from that side.
On male the anal fin has been transformed into a gonopodium. For breeding use about 4 to 6" water at temperatures between 26-30 °C. The gestation period of these fish is about 8 weeks, depending on the temperature of the water. Usually 10-15 fry are born, and the fry are about one inch at birth. The fry should be removed and placed in a tank of their own. The young grow quickly. They live for about 6 years.
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