Yellow Fin Gastrodermus (Gastrodermus sp. (C123))

Remarks:  Yellow fin gastrodermis (Gastrodermus sp. (C123)), also known as yellow fin cories, are an undescribed member of the elegans complex endemic to the Rio Nanay basin in Peru. They have a close resemblance to the elegant gastrodermis (Gastrodermus elegans) as both species share the same body shape, tan or silver color, and brown or dark gray stripes and striations. What sets the yellow fin gastrodermis apart and has made them so coveted in the hobby is their unique, vibrant yellow fins they develop when mature and settled. Both males and females attain this coloration, though some have noted it is richer in males making for a fantastic little catfish.

  In the wild, the yellow fin gastrodermis is only known to be found within forest streams and tributaries of the Rio Nanay basin in Peru. These slow-moving, shallow waterways have sandy bottoms covered in fallen organic debris from overhanging vegetation. This debris stains the waters with tannins, keeps the pH acidic, and provides breeding grounds for bacteria and micro-organisms the yellow fin gastrodermis feeds on. To have the best chance at having these fish thrive and possibly breed within the home aquarium, we recommend attempting to replicate these conditions.

  The yellow fin gastrodermis was previously classified as Corydoras sp. (C123), but was reclassified as Gastrodermus sp. (C123) upon 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 Corydoradinae present in the aquarium and only mix species if one has the space to keep at least six of each.

  Corydoradinae are 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.