Blind Cave Tetra
The Blind Cave Tetra is also known as the Mexican Tetra, Blind Cave Fish or
the Silvery Tetra. They are a good beginnerís fish, as they can tolerate great
variation in water temperature and quality. The scientific name was originally
Anoptichthys jordani, but it is now classified as Astyanax fasciatus mexicanus.
The Blind Cave Tetra is a northern sub species and is found in cave waters in
Texas and Mexico. The eyed version extends from Central to South America.
The body is a flesh/silvery color without features and the fins are
colorless. The dorsal fin has a broad arch to it. The main feature of the Blind
Cave Tetra is an absence of eyes. They are born with eyes, but the sight
deteriorates quickly and the eyes become distorted and covered over within a few
weeks. They navigate in darkness quite well and have well developed taste buds.
This schooling fish has an ability to avoid bumping into other fish, which is
not clearly understood.
Blind Cave Tetras should be provided with dim lighting and small to medium
size gravel. Or, better yet, give them some caves. Plants are not essential. The
tank should be covered as Blind Cave Tetras will jump when they are
stressed. They eat flake foods, freeze dried bloodworms and live brine
Blind Cave Tetras are one of the more aggressive tetras and they will nip
fins. They should be kept with aggressive larger tetras, such as the Buenos Aires Tetra, the
the Serpae Tetra and the
Silver Tip Tetra.
definitely not good companions for smaller tetras and guppies.
The females are larger and broader, especially when laden with eggs.
There is no distinguishing color difference between males and females. If
differentiating the sexes is difficult, the best way to breed Blind Cave Tetras
is to start with a group of about 6 and let them choose pairings. They are
typical tetra egg layers. Parents should be separated and fed live foods prior
to spawning. A drop in water temperature may induce breeding. Up to one hundred
eggs can be scattered throughout the breeding tank. The parents should be
removed after spawning. The eggs will hatch in a couple of days and the fry will
be ready for brine shrimp and finely ground flake foods within a week.
||Astyanax fasciatus mexicanus
||20 - 30
C; 68 - 86 F
||6.0 - 7.8
||9 cm; 3.5
||Normal, Egg Layer
Buenos Aires Tetra, Corydoras Catfish, Danios, Large
Tetras, Mollies, Platies, Plecostomus,
Serpae Tetra, Silver Dollar, Silver Tip Tetra, Swordtails