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Some of these fish, like many of their relatives, are kept as aquarium pets and known collectively as tetras. With around 150 described species and new ones being described yearly, [ 2 ] this genus is among the largest of the entire order; Hyphessobrycon also has more than 145 species and which one is larger at any one time depends on whether ...
The twospot astyanax (Astyanax bimaculatus), [2] [4] also called the two-spot tetra, is a small species of freshwater fish native to South America.It is a middlingly common tetra in the aquarium industry, with hobbyist reports of its sale and presence, and it is also a well-studied member of the genus Astyanax in wild settings.
Astyanax jordani is a freshwater fish of the characin family (family Characidae) of order Characiformes, native to Mexico. [3] [4] It is sometimes called the cave tetra, or by its local Spanish name sardina ciega.
The black tetra is also known as the black skirt tetra. The female black tetra is more robust and larger than the male. [29] Black morpho tetra: Poecilocharax weitzmani: 4 cm (1.6 in) Bleeding heart tetra: Hyphessobrycon erythrostigma: 6.5 cm (2.6 in) The bleeding heart tetra is distinguished by the small red spot on both sides of the fish.
The emperor tetra is a placid aquarium fish and will be disturbed by more boisterous species. It grows to 4.2 cm. [3] It prefers a pH of 6.5, a hardness of 3–6 dKH and a temperature of 23–27 °C. It does not school as readily as most tetras, and a pair appears happier than with most tetras.
The Israeli military has enlisted the first batch of about 50 recruits into its new ultra-Orthodox brigade after a controversial decision to end their decades-long exemption from service.
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