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The Mexican tetra (Astyanax mexicanus), also known as the blind cave fish, blind cave characin or the blind cave tetra, is a freshwater fish in the Characidae family (tetras and relatives) of the order Characiformes. [4][5] The type species of its genus, it is native to the Nearctic realm, originating in the lower Rio Grande, and the Neueces ...
The Amblyopsidae are a fish family commonly referred to as cavefish, blindfish, or swampfish. They are small freshwater fish found in the dark environments of caves (underground lakes, pools, rivers and streams), springs and swamps in the eastern half of the United States. Like other troglobites, most amblyopsids exhibit adaptations to these ...
[17] [18] The loss can be complete or only partial, for example resulting in small or incomplete (but still existing) eyes, and eyes can be present in the earliest life stages but degenerated by the adult stage. [19] In some cases, "blind" cavefish may still be able to see: Juvenile Mexican tetras of the cave form are able to sense light via ...
The southern cavefish was described by Charles Frédéric Girard in 1859 from a well near Bowling Green, Warren County, Kentucky. [4] Later, Eigenmann in 1905 described both T. osborni and T. wyandotte based on differences in head width and eye diameter. [ 5 ]
These fish are blind; no ocular tissue is found in their eye sockets except for a little black spot in each of the eyes. [2] An increase in predation when G. ankaranensis is exposed to UV light might be due to the lack of eyes and pigments. [3] Pigments are necessary when G. ankaranensis is exposed to UV light because they deflect UV light. [3]
Overall life expectancy: 77.5. Women: 80.2. Men: 74.8In 2022, there was a slight increase in life expectancy for men and women, following a two-year decline. Heart disease and cancer remained the ...
Life expectancy in the U.S. was just 47.3 years old in 1900. It rose steadily for over a century until it peaked at 78.9 years in 2014 before declining in 2015, reaching 76.4 years in 2021. It ...
The spring cavefish (Forbesichthys agassizii) is the only member of the genus Forbesichthys and is one of seven species in the family Amblyopsidae. This species is listed as state endangered in Missouri , but it is considered to be of least concern by the IUCN Red List due to its relatively large population size and number of subpopulations.