title: Blue corydoras
text: # Blue corydoras
  
  The blue corydoras or Natterer's catfish (Corydoras nattereri) is a tropical freshwater fish belonging to the subfamily Corydoradinae of the family Callichthyidae. It originates in coastal rivers in South America, and is found in the Brazil from Espírito Santo to Paraná. It is named for Johann Natterer, its discoverer.
  
  The fish has clear fins with no pattern. The ventrals are light, opaque yellow. Highlights seen about the gill plates are green. The belly is yellowish. It has a pronounced dark stripe along the length of the body. General color of the body is light, tending towards yellow. Its eyes are gold. It will grow in length up to 5.4 centimetres (2.1 inches).
  
  It lives in a tropical climate in water with a 6.0 – 8.0 pH, a water hardness of 2 – 25 dGH, and a temperature range of 20–23 °C (68–73 °F). It feeds on worms, benthic crustaceans, insects, and plant matter. It lays eggs in dense vegetation and adults do not guard the eggs.
  
  The blue corydoras is of commercial importance in the aquarium trade industry.
  
  