The Mexican tetra or Blind Cave Fish (Astyanax mexicanus) is a freshwater fish of the characin family (family Characidae) of order Characiformes.[1] [2] The type species of its genus, it is native to the Nearctic ecozone, originating in the lower Rio Grande and the Neueces and Pecos Rivers in Texas as well as the central and eastern parts of Mexico.

Growing to a maximum overall length of 12 cm (4.7 in), the Mexican tetra is of typical characin shape, with unremarkable, drab coloration. Its blind cave form, however, is notable for having no eyes and being albino, that is, completely devoid of pigmentation; it has a pinkish-white color to its body.

The Blind Cave Tetra is also known as the Mexican Tetra. They are a very unusual looking fish as they don't have any eyes or pigmentation! They are however a very popular choice for the freshwater aquarium as they are hardy and relatively easy to keep. The Blind Cave Tetra's use their lateral line sensory organs to find their way around, this sense organ is very sensitive to water pressure.

" Profile of the Blind Cave Tetra"This Profile contains interesting facts and information about the Blind Cave Tetra species.

Size:Up to 12cm
Fish Tank conditions: PH 6.0-7.5. 20 -25 Degrees.
Diet / Feeding: Dried, Flake or Frozen food
Temperament: Peaceful, Good Community Fish
Habitat: Caves - Rocky river beds, Rivers and Deep Streams

Range: Nearctic ecozone including Mexico


"Scientific Classification of the Blind Cave Tetra"

 Scientific classification, or biological classification, is how biologists group and categorize species of organisms with shared physical characteristics. Scientific classification belongs to the science of taxonomy.

Species: Astyanax fasciatus mexicanus
Popular Name: Blind Cave Tetra - Blind Tetra
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
 Family: Characidae

"Black neon tetra"

The black neon tetra (Hyphessobrycon herbertaxelrodi) is a freshwater fish of the characin family (family Characidae) of order Characiformes. It is native to the Paraguay basin of southern Brazil.
This species is of typical elongated tetra appearance; it is of plain basic coloration but with two distinct, adjacent longitudinal stripes, white above black. The eye has two thin but distinctive color bands across the top, red above yellow.

 It grows to a maximum overall length of approximately 4 cm (1.5 in). Despite its common name, it does not particularly resemble the neon tetra, which belongs to a different genus.
The fish's natural diet consist of small invertebrates and plants.
H. herbertaxelrodi is commonly kept as an aquarium fish by hobbyists.

The black neon tetra is sometimes called the black tetra, but that name more properly refers to a different species.

The Black Neon Tetra is sometimes referred to as the Black Tetra and can be identified by its silver body with two stripes which run along the length of its body; one large black stripe and a smaller white stripe. It also has distinctive orange stripe above its eye. A schooling fish, this species prefers to be in groups of at least six.

"Profile of black neon tetra"
This Profile contains interesting facts and information about the Black Neon Tetra species.

Size: Up to 4cm
Fish Tank conditions: PH 5.5 to 7.0. Temp 23 to 27 Degrees
Diet / Feeding: Dried, Frozen, Flaked Food, Brine Shrimp
Temperament: Peaceful
Habitat: Freshwater Streams and Lakes
Behaviour: Good Community Fish
Range: Paraguay, Braz

"Scientific Classification of the Black Neon Tetra"
Scientific classification, or biological classification, is how biologists group and categorize species of organisms with shared physical characteristics. Scientific classification belongs to the science of taxonomy.
Species: Hyphessobrycon herbertaxelrodi
Popular Name: Black Neon Tetra - Black Tetra
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Characidae