Cardinal tetras are native to the Orinoco and Negro Rivers of South America. These colorful fish, with their blaze of iridescent blue underlined by bright red, are popular aquarium fish. In addition to captive breeding programs, cardinal tetras are also sourced from sustainable fisheries in Barcelos, Brazil, a system which allows local people to make a living while acting as environmental stewards (instead of turning to environmentally destructive practices for survival).
https://en.wikipedia.org/wiki/Cardinal_tetra
http://www.petsource.org/aquatic-by-species/aquatic-fresh-water/3751-cardinal-tetra.html
Undersea Conversations…
While it isn’t obvious, fish have ears, and are able to communicate to one another through sounds. They don’t have vocal chords, but instead vibrate their swim bladders, producing popping, grunting, moaning, barking, or chirping noises. While some species of fish, like the goldfish, are silent listeners, there are over 1000 species that are known to vocalize, and some, like the gurnard who are veritable chatterboxes. While we can’t have a conversation with them - at least not yet - it is theorized that they do it to attract mates, frighten away predators or competitors, to synchronize mating, call for help and warn others, or to orient themselves.
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