Metynnis argenteus (Serrasalmidae)

The silver dollar closely resembles the piranha, but it is herbivorous, needing large supplements of vegetable material; without these, it will nibble away the vegetation. Size: 10-15 cm.

• Poecilia velifera
• Geophagus steindachneri
• Tetraodon fluviatilis
• Xiphophorus variatus
• Neolamprologus tetracanthus