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Metynnis argenteus
''Metynnis argenteus'' is a species of serrasalmid endemic to the Tapajós River Basin in Brazil. It is one of the species known in the aquarium trade as the "silver dollar". ''M. argenteus'' is generally considered the archetypal silver dollar, although it and the very similar ''M. hypsauchen'' frequently have been confused.〔SeriouslyFish: ''(Metynnis argenteus. )'' Retrieved 4 June 2014〕
==Identification==
Round-bodied and laterally compressed, under normal conditions ''M. argenteus'' is a uniform silver colour, sometimes showing vague red colouration in the fins and around the throat. Commonly seen for sale as juveniles at around two inches long, they are peaceful shoalers. Fully grown females in captivity can reach a length of between five and six inches while males tend to be marginally smaller. In good condition, females tend to be fuller in the belly than males, while males develop marginally longer fins as they grow older. During courtship and breeding, males develop two large, very prominent black spots, one above the other, just behind the base of the pectoral fins, the red colouration of the fins deepens and contrasting black borders appear. Some male specimens may also display other dark marbling on the flanks. Females display little, if any, variation in colour during courtship and breeding.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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