Morona

The two spot astyanax, Astyanax bimaculatus, is a characid ranging from Panama through most of the Amazon and Orinoco basins. It lives in a wide variety of biotopes, from swiftly-flowing rivers and streams to ponds, ditches and reservoirs. The name is currently applied to what is considered a species complex of at least four taxa, and aquarium fish most often arrive as contaminants among shipments of other species.

Otocinclus macrospilus, one of the commoner otos in the hobby, is a small loricariid endemic to parts of the Upper Amazon in Peru. It is frequently mislabelled as O. affinis or O. vittatus, and a large round black blotch at the base of the caudal fin separates it from O. vestitus. Imported fish can be delicate, usually through starvation in transit, and do best added to mature, planted tanks.