When in peak condition, the Silver Prochilodus (one of only a few prochilodontids seen with any regularity) is an extremely attractive fish in which the black-and-white markings of the dorsal and caudal fins contrast beautifully with the silvery body and the bright red pelvic fins. Its main drawbacks as an aquarium fish are its plant-eating and burrowing habits, and its relatively large size.
[Ebook] Encyclopedia of Aquarium & Pond Fish – Directory of Freshwater Fish – Characoids – Larger vegetarian species
Shaped rather like a coin, with a silvery body color, the Silver Dollar makes an impressive tank occupant, especially when a shoal of these fish are housed together. They can be sexed quite easily, since the anal fin is longer in males and has a reddish tinge at the front.
The characins are a large group of freshwater fishes found in South and Central America and Africa. They are characterized by the Weberian Apparatus (the linkage of bones between the swimbladder and the inner ear) that allows them to hear high frequency sounds.