Remarks: Gold green Osteogasters are similar at first glance to green aeneus Osteogasters, however they have longer bodies, yellow fins, and a longer green blotch on their sides. While they are similar in appearance, these two fish differ further in that the gold green Osteogaster likes things a little cooler and isn’t quite as hardy or easy to breed. This has resulted in them becoming less common in the hobby despite their vibrant yellow coloration. In the wild, they can be found in cool, shallow, tannin-stained areas of the Rio Meta basin in Columbia and do best if these conditions are replicated within the aquarium.

Gold green Osteogasters were previously classified as Corydoras melanotaenia, but were reclassified as Osteogaster melanotaeniaupon publication of a phylogenomic analysis in 2024 that reclassified many species in the Corydoradinae subfamily.

Corydoradinae are small, peaceful catfish that are active shoalers and will stay near conspecifics, making for a lovely sight.They feed by searching through sand with their barbels, making such a substrate necessary for their long-term health. Gravel substrates tend to be abrasive and damage the barbels, leading to infections and an inability to find food.

While these friendly catfish are willing to swim with other species of Corydoradinae different from their own, this does not provide the same social need as being kept with members of their own species. Because of this, it is highly recommended to keep at least six of each species of Corydoradinaepresent in the aquarium and only mix species if one has the space to keep at least six of each.

Corydoradinaeare often looked at as “scavengers,” but they should be treated in a similar fashion as the rest of your fish. They are omnivores and require a mixed diet. Sinking prepared foods are readily accepted, as are frozen and live foods such as brine shrimp, blackworms, and bloodworms.