Blue Cory

Adults of this species reach approximately 5 cm in length. A distinctive feature of the fish is its stocky body, characteristic of most Corydoras, covered in rows of bony plates. Their coloration is light gray, complemented by a broad black stripe that runs from the tail to the middle of the body. Under certain lighting, the bony plates can be seen to shimmer with greenish or bluish hues.

The habitat covers coastal river systems in southeastern Brazil, including the states of Espírito Santo, Rio de Janeiro, São Paulo, and Paraná. The fish inhabit small streams, rivers, and tropical forest areas subject to seasonal flooding. In their natural environment, they prefer slow-flowing waters with sandy or fine gravel substrate and an abundance of shelters in the form of snags and dense vegetation.

These peaceful and calm fish spend most of their time exploring the aquarium bottom or finding cozy hiding spots. Their activity increases in the evening hours or under dimmer lighting. They coexist well with many non-aggressive fish species of comparable size. However, it is worth noting that Natterer's Corydoras, unlike most other Corydoras, prefers relatively low water temperatures, which can significantly narrow the range of potential tank mates.

For a group of 3–4 corydoras, the optimal aquarium volume starts from 40–50 liters. When decorating, it is recommended to opt for dark, soft substrates. It is also important to provide several shelters, which can be created using dense plant thickets, snags, tree bark, or fallen leaves from certain trees. Lighting should preferably be subdued, although this is not a strict requirement. As already mentioned, maintaining a low water temperature is critically important. Otherwise, the Blue Cory is not demanding and successfully adapts to a wide range of basic hydrochemical parameters, such as pH and dGH.

In nature, they are omnivorous, feeding on small invertebrates, insect larvae, crustaceans, and plant detritus. In the aquarium, they accept any sinking foods: specialized tablets for bottom-dwelling fish, high-quality dry flakes, as well as frozen or live foods such as bloodworms, daphnia, and brine shrimp. Feeding is recommended in the evening or under subdued lighting, as the fish show the greatest activity in searching for food during this period.

Spawning is paired or group-based, stimulated by frequent water changes with cooler water. The female lays eggs on illuminated surfaces—plant leaves or aquarium glass. After the process is complete, it is recommended to remove the parents to prevent them from eating the eggs. The incubation period lasts from 6 to 10 days, depending on the temperature. Fry begin to feed independently after becoming free-swimming; initial food includes Artemia nauplii or micro-food.

The species is susceptible to diseases typical for armored catfish when kept in improper conditions. The main dangers are bacterial infections affecting the skin and fins, as well as fungal diseases of the eggs. They are sensitive to the accumulation of organic waste and sudden changes in water parameters. Prevention includes regular gravel vacuuming, maintaining substrate cleanliness, and using fungicidal preparations during egg incubation.

When purchasing, select active individuals with clean skin without visible spots, ulcers, or fin damage. It is important to check the condition of their barbels—they should be intact, without signs of erosion, which indicates proper care in the store. Avoid fish with sunken bellies or signs of apathy. It is recommended to acquire a group of 5–6 individuals, as fish kept alone become timid and prone to stress.