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Banded Tetra, Astyanax aeneus , Female. Fish caught from Barton Creek, Belize, October Length: 12 cm 4. Catch, photograph, and identification courtesy of Josh Leisen lifelistfishing. Globally, there are species in the genus Astyanax named after Astyanax, the son of Hector of Troy in Greek mythology — not to be confused with Helen , of which three are found in the freshwater systems of mainland Mexico.
They are very colorful being greenish-brown dorsally and transitioning to silver then to white ventrally. Their colors vary from location to location with more brightly colored fish being found in murky environments. Their caudal fin is red or yellow.
The key to identification is the presence of a black rhomboidal blotch on their caudal peduncle that extends to the center of their caudal fin. They have transparent fins with minimal dark red pigments on the first rays of their anal and dorsal fins. Their head has a small slightly upturned terminal mouth and large eyes placed directly behind the mouth.
Their anal fin has 3 or 4 spines and 22 to 30 rays; their caudal fin is deeply forked; their dorsal fin has 2 spines and 8 or 9 rays and is followed by a small apidose fin on the caudal base above the anal fin; and, their pectoral fins have 1 or 2 spines and 10 to 14 rays.
They have 19 to 26 gill rakers. They are covered with large scales. The Banded Tetras are a benthopelagic schooling species found in all types of freshwater environments from fast flowing rivers and streams to marshes and stagnant pools. They are found from sea level to elevations of 1, m 3, feet. They feed on algae, seeds, leaves, aquatic and terrestrial insects, and fish fry.
The Banded Tetra is poorly studied and very little is known about their behavioral patterns. Due to its prominent black tail blotch, the Banded Tetra is straightforward to identify and cannot be confused with any other species. The Banded Tetras are very abundant in many locations. They have not been evaluated from a conservation perspective but should be considered of Least Concern.
They are caught in abundance via nets in lake shallows and used as bait fish, for food, by the aquarium trade, and for monitoring aquatic environmental quality in areas that have significant pollution from agrochemical residues.
They are also an important contributor to their aquatic ecosystems as they excrete disproportionately large amounts of phosphorous, with levels ten-fold higher than other species in the same environment.
Banded Tetra, Astyanax aeneus , Female. Fish caught from Barton Creek, Belize, October Length: 12 cm 4. Catch, photograph, and identification courtesy of Josh Leisen lifelistfishing. Globally, there are species in the genus Astyanax named after Astyanax, the son of Hector of Troy in Greek mythology — not to be confused with Helen , of which three are found in the freshwater systems of mainland Mexico. They are very colorful being greenish-brown dorsally and transitioning to silver then to white ventrally.
Species: Astyanax aeneus, Banded tetra, Penjamo tetra
Astyanax is a genus of freshwater fish in the family Characidae of the order Characiformes. Some of these fish, like many of their relatives, are kept as aquarium pets and known collectively as tetras. With around described species and new ones being described yearly,  this genus is among the largest of the entire order; Hyphessobrycon also has more than species and which one is larger at any one time depends on whether more species have been recently described in one or the other. The blind and colorless cave tetra of Mexico is a famous member of the genus, but its taxonomic position is disputed: Some recognize it as part of the Mexican tetra A. The type species is A.
Mexico – Fish, Birds, Crabs, Marine Life, Shells and Terrestrial Life
The use of biomarkers for monitoring aquatic environmental quality has gained considerable interest worldwide. Three study sites along the freshwater portion of the river were monitored in April, July, and November and February This study includes a water quality index, a set of biomarkers hepatic glycogen levels and lipid peroxidation in liver, gills, and muscle to assess the integrated biomarker response, and population bioindicators gonadosomatic and hepatosomatic indices and Fulton's condition factor. The integrated biomarker response showed stress periods with higher biomarker response and recovery periods with decreasing biomarker values. The somatic indices did not indicate severe effects at the population level.