Aquarium Fish

Blind Cave Tetra

Blind Cave Tetras are a relatively new tetra to the mainstream aquarium keepers. As there name would indicate, the Blind Cave Tetras have no eyes. They are born with eyes as fry, but the eyes degenerate and are reabsorbed back into the body at a few weeks old. There is a form that has eyes, although you do not generally see this version on the market.

These cave tetras are also completely devoid of pigmentation. They are pink, but will get an iridescent sheen to them as they get older.

The Blind Cave Tetra lives in deep caves in the wild. They range from Texas to Mexico, with the sighted version from Mexico to Panama. There is no need for eye sight in the pitch black caves, so they have evolved to adapt to these conditions.

Blind Cave Tetra

A larger tetra, Blind Cave Tetras need a minimum of 20 gallons for a school of 5. They can reach up to 4 inches. They prefer subdued lighting, as it is closer to their natural habitat. A sand or small gravel is preferred. Although some will learn to eat off of the surface of the water, most will root in the substrate for food. They do very well on sinking food. They will eat anything that they can get a hold of from flakes, pellets, to live foods. They will also eat any eggs from other fish that may be in the substrate.

Although they are blind, they very rarely swim into the tank sides, decor or other tank mates. They may nip at tank mates when first introduced into a new aquarium, but once they learn that they are not food - they rarely do it again.

These fish are being used in studies about eye growth and transplant. Many strides in the science of the eye have been reached because of research conducted on this fish. The results have scientists hopeful that there is a treatment to cure blindness in humans.

Blind Cave Tetra Video

Blind Cave Tetra Care

Scientific Name : Astyanax jordani

Common Names : Blind Cave Tetra, Mexican Tetra

Care Level : Easy

Size : 3.5 to 4 inches (~ 9 cm)

pH : 6.0 to 7.5

Temperature : 68 - 77 °F (20-25 °C)

Lifespan : 3 to 5 years, possibly longer

Origin / Habitat : Texas, USA and Mexico

Temperament / Behavior : Fairly peaceful, keep them in schools of 5 or more. May nip at tank mates.

Breeding : Egg layer.

Aquarium Size : Minimum of 20 gallon for just a school of 5

Blind Cave Tetra Tank Mates : Virtually anything that won't eat them or has relatively the same water parameter requirements

Fish Disease : Freshwater Fish Disease

Diet / Fish Food : Omnivore, will accept flakes, granules, pellets, frozen foods and live foods.

Tank Region : Middle of the aquarium

Gender : No distinguishing external differences between the sexes. The females when full of eggs are wider when looked at from above

Similar Species : see more Tetras

Profile by : Amanda

Photo Credit: JohnstonDJ - wikipedia




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