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Metynnis argenteus, Metynnis hypsauchen, Metynnis maculatus
One of my favorite fish. The Silver Dollar is a peaceful schooling species
with a great personality. One word of caution they love greens and will
completely defoliate a fish tank in no time at all. They should have
some short of vegetable supplement in their diet. There can be some
species confusion in the pet stores and when young they can be difficult
to iodentify. They have the same basic needs.
Listed tank sizes are the minimum
||Up to 8" (20cm)
||6.0 to 7.5
||Soft to medium. dH range: 4.0 - 18.0
||75°F to 84°F (24-29°C)
Silver dollar, Schreitmullers' Metynnis
Widely distributed throughout South America, from Guyana to Paraguay,
including the Amazon river basin.
General Body Form
Basically circular in shape, as long as tall, with very marked lateral
compression. The front on profile of the back and stomach are not uniformly
convex (out ) , but rather curve in at the Dorsal and Anal fin level.
Like most members of the family (Piranha included!) they have tiny scales
with small mouths and enlarged lips. The Caudal fin is slightly indented,
the Adipose fin is long and short and in mature males the front part
of the anal fin is crescent shaped. They can reach a size of five and
one half inches, with the males smaller than the females.
The entire body is basically a strong Silver/Gray, with a high iridescence,
which is highlighted when the fish are in a large school. The back is
slightly darker being Greenish/Gray or Greenish/Blue in color. The Anal
fin has a pale tinge of Silver color in the front that fades toward
the back. The Dorsal fin is clear with a series of small dark spots.
In well cared for males, the Caudal fin and the Gill cover have a Reddish
border. A narrow, dark vertical band runs through each eye. As with
most fish there are color variations.
Shallow areas of their home range that are heavily vegetated
The Silver Dollars require a large tank, a standard 55 or 40 gallon
would be fine. The tank should have no live plants as this species is
mainly vegetarian in habit. The substrate should be dark in color with
subdued lighting. They are schooling fish and will always be shy and
skittish in a small tank, so give them as much room as possible. The
diet should primarily include plant material, particularly Romaine Lettuce,
along with the various live foods. Water quality is not critical and
the temperature should be kept in the upper Seventies to low Eighties.
In nature these fish spawn in shallow, sun drenched flooded areas of
rivers. In the home aquarium they have been breed in clear aged water
with a temperature between 81 and 90f. The eggs hatch in about four
days and are free swimming a week later. If well fed they will grow