Salmacis Cory

About

Found in the rocky, slow-moving waters of southern Brazil, Scleromystax salmacis is a miniature callichthyid catfish that maxes out at around an inch and a half. Like its relatives, it carries rows of bony plates rather than scales along its flanks. The reason members of this family are commonly called armored or mailed catfishes. What makes handling any Scleromystax worth treating carefully is the stiffened spines of the pectoral fins, which can pierce skin and deliver a genuinely painful sting, possibly worsened by secretions from glands at the spine base that may carry mild venom. In the wild, this species has been collected from a shaded pond connected to a small creek near arroio Molha Coco, sharing the water with a diverse mix of tetras, loricariids, and livebearers. Like other callichthyids, it can gulp atmospheric air at the surface using a modified, vascularized section of intestine, an adaptation for surviving in low-oxygen conditions. You will see this behavior regularly in the aquarium. It is listed as a beginner-friendly fish, and its small adult size makes it manageable in modest setups, though it is not commonly encountered in the hobby and its taxonomy within the Scleromystax genus remains a work in progress.