Darrell Ullisch wrote:I can say without question that these are not Metynnis lippincottianus or maculatus. Those two species have large, rounded spots over the entire body in both sexes, and lippincottianus has a very bright, distinct orange spot at the ear position behind the gill cover.
M. hypsauchen males do develop markings at sexual maturity, and they do lose the orange in the anal fin, which females retain. There are several species of Silver Dollars that are dramatically dichromatic between the sexes, and some have been mistaken for different species in the past. One thing to note, all Metynnis species have the sexual characteristic of the extended rays forming a "bump" in the edge of the anal fin of the males. Females will have a straight or slightly concave edge.
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