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Latest Tetras Stories

2012-01-23 13:13:31

The blind Mexican cavefish (Astyanax mexicanus) have not only lost their sight but have adapted to perpetual darkness by also losing their pigment (albinism) and having altered sleep patterns.

2011-04-08 13:13:16

Cave life is known to favor the evolution of a variety of traits, including blindness and loss of eyes, loss of pigmentation, and changes in metabolism and feeding behavior.

2011-03-01 17:04:00

THE WOODLANDS, Texas, March 1, 2011 /PRNewswire/ -- TETRA Technologies, Inc.

2010-10-20 07:30:00

CHICAGO, Oct. 20 /PRNewswire/ -- This Saturday marks the 24th annual Spooky Zoo Spectacular at the Lincoln Park Zoo and Tetra Pak, a global leader in sustainable food and beverage packaging with U.S.

2010-09-15 15:44:16

University of Maryland biologists have identified how changes in both behavior and genetics led to the evolution of the Mexican blind cavefish (Astyanax mexicanus) from its sighted, surface-dwelling ancestor.

2009-06-29 10:03:58

It might be assumed that aquarium fish don't mind who or what they encounter in their tanks from one minute to the next, if their famously (but incorrectly) short memory is to be believed.


Latest Tetras Reference Libraries

Black Tetra, Gymnocorymbus ternetzi
2013-10-18 12:27:31

The Black Tetra (Gymnocorymbus ternetzi), known also as the Black Skirt Tetra, High-fin Black Skirt Tetra, and the Black Widow Tetra, is a freshwater fish belonging to the characin family Characidae. It is native to the Paraguay and Guapore River basins of southern Brazil, Argentina, and Bolivia. Achieving lengths of about 2.5 inches in total length, the Black Tetra has a tetragonal body shape and is greyish in coloration, fading from light at the nose to near black at the tail. Two...

47_ef1bd83b15ae08fdbbad6fe1f47f6c1f
2008-05-01 00:19:01

The Green Neon Tetra (Paracheirodon simulans), is a freshwater fish of the characin family Characidae of order Characiformes. It is native to the upper Orinoco and Negro Rivers in South America. This fish is similar in appearance to the closely-related and better-known neon tetra, but it is slightly smaller and its red patch is less pronounced, while the blue-green areas of the upper body are more brilliant. It grows to a maximum overall length of approximately 1 inch. Like the other...

39_0edaea1c57695a4ccd819ed5139e6d5f
2007-04-05 00:44:57

Cynodontidae fishes (order Characiformes), or Dogteeth tetras, are a family of freshwater fishes found in the Neotropics. They have a very peculiar shape, and their name derives from their elongated and well developed canines which they mainly use to eat other fish. Their pectoral fins are also expanded. This group is not very diverse, and includes only five genera and 14 species. Most of what is known about this family is from the members of the subfamily Cynodontinae, which includes the...

0_6bd30915f14d3e3e4ceab7202dffea97
2007-03-29 14:37:34

Pterophyllum is a small genus of freshwater fish from the family Cichlidae known to most aquarists as angelfish. All Pterophyllum species originate from the Amazon River basin in tropical South America. The three species of Pterophyllum are unusually shaped for cichlids being greatly laterally compressed, with round bodies and elongated triangular-shaped dorsal and anal fins. This body shape allows them to hide among roots and plants, often on a vertical surface. Naturally occurring angelfish...

39_a218659b2845525b6c1153bf259a0998
2007-03-26 13:47:14

Astyanax jordani is a freshwater fish of the Characin family (family Characidae) of order Characiformes, native to Mexico. It is often referred to by its local Spanish name Sardina Ciega but is more commonly called the Cave tetra. A blind cave fish, A. jordani is a recent evolution from the Mexican tetra (A. mexicanus). While it can be confused with the blind cave form of A. mexicanus, it evolved separately from the surface form, and is considered a different species. (IUCN, however,...

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Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.