Serratus Cory

Geographical Origin and Habitat: From the upper course of the Rio Negro in Brazil. Strictly inhabits small forest tributaries with pristine, acidic and very soft dark waters (Blackwater), surrounded by dense Amazonian jungle.

Taxonomy and Morphology: Serrated Corydoras (Corydoras serratus). Iconic species of the "long-snouted" group. Shares almost the same pattern as Corydoras adolfoi or burgessi, but is immediately distinguished by its elongated and pointed skull.

Social Behavior: Highly gregarious, requires groups of at least 6-8 individuals. Compared to short-snouted counterparts, C. serratus spends much more time resting on its pectoral fins or hiding, becoming active at dusk to forage.

Coloration and Sexual Dimorphism: Extraordinary coloration: cream body with a large neon orange spot on the back just before the dorsal fin, a black band across the eye (blindfold), and a thick black line along the back. Females wider than males.

Aquarium Setup: Requires very spacious aquariums (minimum 100 cm / 40 inches). Fine sand mandatory. The ideal setup includes a dense layer of decaying leaves (Catappa), intricate thin branches, and absent or very shielded lighting.

Diet and Feeding: Micro-predator. The long snout is used to probe the sand and extract worms. It is vital to offer small live or frozen food (bloodworms, brine shrimp, daphnia) and highly nutritious and protein-rich bottom supplements.

Water Quality: Like many Rio Negro fish, it demands very soft (GH 1-5) and acidic waters (pH 5.5-6.5). It does not tolerate nitrates and pollutants, making water changes with RO and tank maturation critical steps.

Compatibility and Cohabitation: Magnificent in Blackwater thematic tanks with small peaceful pelagic fish such as Nannostomus, Hemigrammus or Paracheirodon innesi. Must not be kept with fast, turbulent fish or aggressive Cichlids.

Aquarium Breeding: Rare in captivity. Triggered by simulating the rainy season with cool water changes and RO, lowering the temperature. They lay large adhesive eggs among fine-leaved vegetation. Parents may devour the eggs.

Risks and Diseases: Highly susceptible to systemic or fungal infections if kept in overly hard or alkaline waters. Loss of barbels on inadequate bottoms quickly leads to death by starvation.