Silver Dollar and Similar Species
Metynnis
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Open the appSeveral fish can be confused with Silver Dollar. Here are the key differences.
Species often confused with {name}
Myleus spp. (Pacu)
Myleus spp.
Key differences: While also disc-shaped and herbivorous, Myleus species generally grow much larger, have a more robust body, and often exhibit different coloration patterns (e.g., red bellies in some species). Their teeth are typically more molar-like for crushing seeds, whereas Metynnis have sharper, incisor-like teeth for shearing plant matter.
Piaractus brachypomus (Red-bellied Pacu)
Piaractus brachypomus
Key differences: Often confused with Metynnis as juveniles due to similar body shape and silvery color. However, Piaractus grows significantly larger, has a more pronounced red coloration on the belly as it matures, and its teeth are more human-like, adapted for crushing fruits and nuts.
Colossoma macropomum (Tambaqui)
Colossoma macropomum
Key differences: Another large pacu species. Juveniles can resemble Metynnis, but Tambaqui grow to immense sizes (over 1 meter) and have a more robust body and different dentition. The adipose fin is also much larger in Colossoma.
Other Metynnis species
Metynnis spp.
Key differences: Distinguishing between different Metynnis species (e.g., M. argenteus, M. hypsauchen, M. maculatus) often requires close examination of subtle differences in body depth, fin coloration, presence/absence of spots, and meristic counts (e.g., fin ray counts, lateral line scales). For example, M. maculatus has distinct black spots, while M. argenteus is typically spotless.
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