Napo Corydoras

A small, slender cory with a pale silver-beige body, a dark horizontal stripe or series of connected blotches and a marked tail base. Large eyes and a light build give it a hovering, midwater-ready appearance.

Identify this profile by the combination of a small elegant body with fine spots, a dark lateral pattern, and frequent bottom-to-midwater shoaling. Older sources commonly list this fish as Corydoras napoensis; the current profile follows the accepted or revised placement Gastrodermus napoensis. Colour alone can be unreliable in stressed, juvenile, or poorly conditioned fish, so body shape, snout length, fin pattern, and provenance should also be checked.

Females are usually broader and fuller through the abdomen, while males remain slimmer. Colour and pattern overlap strongly between the sexes, so body shape in mature fish is the safer guide.

Keep a sizeable group in a mature aquarium with fine sand, gentle open swimming room above the bottom, plants or wood for cover and consistently clean, oxygen-rich water. These fish may spend more time away from the substrate than many corys, so avoid crowding the lower and middle levels.

A peaceful, coordinated shoaling fish that often uses the lower and middle water as well as the substrate. A small group can appear nervous or inactive, while a larger group shows more natural hovering, darting and foraging behaviour.

Keep at least 8 of the same species or coded population, with 10 or more preferred where space permits. A mixed collection of single corys does not fully replace a proper same-species group.

It is not territorial. Males may briefly chase one another or follow females during courtship, but sustained aggression is unusual when the group has adequate floor space.

Works best with small, peaceful midwater fish and other gentle bottom species. Avoid aggressive or highly competitive tank mates, and do not assume dwarf shrimp young will be safe from opportunistic feeding.

Soft, mildly acidic water best reflects the natural habitat and usually gives the most reliable breeding results. Stable clean water is more important than forcing an exact pH.

Use small sinking or slow-falling foods, including quality micro-pellets, wafers and varied frozen or live invertebrate foods. Feed across more than one area because these fish may take food in the lower water as well as from the substrate.

Feed after faster surface and midwater fish have taken their share, and confirm that every individual reaches food. Use small portions once or twice daily, remove persistent leftovers, and vary prepared and frozen or live foods.

Captive spawning is reported less often than for common corys. A well-conditioned group, excellent water quality and seasonal-style changes may help, but egg production and fry survival can be inconsistent; the adults do not provide parental care.