Silver Pacu and Similar Species
Piaractus brachypomus
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Open the appSeveral fish can be confused with Silver Pacu. Here are the key differences.
Species often confused with {name}
Black Pacu
Colossoma macropomum
Key differences: C. macropomum (Tambaqui) typically has a darker, more uniform coloration, often with a blackish or dark grey body. Its adipose fin is smaller and lacks rays, whereas P. brachypomus has a larger adipose fin with a few rays. The head profile of C. macropomum is generally more convex, and its teeth are more robust and rounded. C. macropomum also tends to grow larger on average.
Red-bellied Piranha
Pygocentrus nattereri
Key differences: Piranhas have sharp, triangular, interlocking teeth, distinctly different from the molar-like teeth of pacu. Piranhas also have a more aggressive demeanor and a more compact, less deep body shape relative to their length. The red coloration on the belly of P. nattereri is typically more intense and extends further up the flanks than in P. brachypomus juveniles.
Small-scaled Pacu
Piaractus mesopotamicus
Key differences: P. mesopotamicus (Parana Pacu) is generally smaller than P. brachypomus and has smaller scales. Its geographic range is primarily the Paraná-Paraguay basin, while P. brachypomus is from the Amazon and Orinoco. Morphological differences are subtle and often require expert examination, but P. mesopotamicus typically has a more elongated body and a less pronounced red belly patch.
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