- Scientific name: Astyanax jordani
- Synonyms: Anoptichthys antrobius, Anoptichthys hubbsi, Anoptichthys jordani, Astyanax mexicanus jordani
- Common name: Blind Cave Fish, Blind Cave Tetra
- Group: Characins
- Habitat: Central America; Mexico
- Size: 9-10 cm
- Biotope: Inhabits in the San Luis Potosi area, in underground lakes and cave streams.
- Social behavior: Peaceful, schooling fish, but may nip at other fish while searching for food. Should be kept in a species only aquarium, because of their special demands.
- Diet: Omnivorous, Will accept most foods including pellets and flake as well as live and frozen foods such as bloodworm and brine shrimp. Usually root in the substrate for food.
- Breeding: Quite easy
- Tank: Minimum 80 litres
- Population: 4-5 fishes for 80 litres
- Decoration: Stones, rocks and small gravel substarte. Plants and lighting are not necessary in the tank.
- Temperature: 20-25 °C
- pH: 6-7.8
- Hardness: 20-30 NK°
- Lifespan: 5-6 years
Description: Astyanax jordani has no body pigmentation, and the base color of the body is pinkish with an iridescent sheen. Blind Cave Fish is evolved separately from the surface form of Mexican Tetra (Astyanax mexicanus), and because of this, it might be hard to distinguish them. Astyanax jordani is born with developed eyes, and as there is no need for eye sight in the pitch black caves, a flap of skin covers them over as the fish matures. Instead of eyes, Astyanax jordani have an improved senses of taste and is able to store fat more efficiently than other fish. Also their lateral line is more sensitive than the same sense in other fishes. Blind cave fish appear to be employing the lateral line to detect the displacement waves from their own swimming motion when reflected by nearby objects in order to avoid obstacles. This characin is listed on the IUCN Red List as Vulnerable on the basis of shrinking population and an acutely-restricted and diminishing area of occupancy, so only captive bred fish would be available for sale, and only rarely.
Females tend to be larger and more plump when viewed from above, than males. Breeding is quite easy at the lower temperature of 20 °C. A well cared for pair will spawn regularly. Their eggs are white and look like they are infertile but most will hatch. Parents should be removed after spawning, as they usually eat the eggs. The fry, once free swimming can be fed with small live foods or with liquid fry food.