🐟 10 interesting facts about catfish (Corydoras)

🐡Corydoras are very popular aquarium fish, so it's worth taking a closer look at their characteristics; some information might be new to you.

1. They live in groups – and suffer when alone

Corydoras are typically shoaling fish that need the company of their own kind. In a group of at least six, but preferably more individuals, they are more active, less stressed, and exhibit their natural behavior.

2. They breathe not only through gills but also through their intestines!

In addition to gills, Corydoras can absorb oxygen through their intestinal epithelium. You will often see them quickly surfacing to gulp air – this compensates for the low oxygen content in the water.

3. They are covered in "armor"

The bodies of Corydoras are not covered in regular scales but rather by two rows of bony plates (known as "armor") on the sides. These provide protection against predators and mechanical injuries.

4. Quiet but very curious fish

Although they are calm and peaceful, Corydoras are very curious and active, especially when foraging on the bottom. They have an excellent sense of smell and sensitive whiskers that help them search for food.

5. The genus of Corydoras has more than 170 species

The genus Corydoras is one of the largest genera of freshwater fish. It includes over 170 scientifically described species and dozens of other forms, color varieties, and local forms. For example:

Corydoras paleatus (spotted corydoras)

Corydoras aeneus (bronze corydoras)

Corydoras panda (panda corydoras)

Corydoras sterbai (Sterba's corydoras)

6. The female collects eggs in pockets made from her own fins

During spawning, the male fertilizes the eggs, which the female then carries and sticks to surfaces like glass, plant leaves, or decorations using her abdominal fins.

7. They are not "cleaners" – they need their own food

Although they collect leftover food from the bottom, they are not a cleanup crew. They require quality food, ideally sinking pellets, live or frozen food (such as bloodworms, daphnia, mosquito larvae).

8. They inhabit South America – even extreme conditions

Corydoras primarily come from the Amazon basin, but they also inhabit small streams, seasonal pools, and flood areas. Some species can survive in murky or oxygen-poor water.

9. They are ideal for community aquariums

Due to their gentle nature, they are well-suited to tetra fish, livebearers, gouramis, and small cichlids. It is important that the bottom of the aquarium is not sharp – fine sand is best.

10. They can live up to 10 years

With good care, Corydoras can live 8 to 10 years, and in rare cases even longer. A suitable group, stable conditions, and quality nutrition will ensure them a long and happy life.