CHARACIDAE / TETRA

The Characidae family, commonly known as characids, is a diverse group of freshwater fish within the order Characiformes. These fish are native to Central and South America, Africa, and a few other tropical regions. They are often recognized by their distinctively sharp teeth, specialized for a variety of feeding habits. Many species in this family are popular in the aquarium trade, with some well-known examples including tetras, piranhas, and silver dollars.

Key Features of Characidae

1. Body Shape and Size: Characids come in a variety of sizes and shapes, typically ranging from a few centimeters to over 30 cm (in larger species like piranhas).
2. Fins: Many species possess an adipose fin (a small, fleshy fin between the dorsal fin and tail), which is characteristic of the family.
3. Teeth and Jaws: Members of Characidae often have sharp or specialized teeth, which reflect their dietary preferences, including carnivorous, omnivorous, and herbivorous species.
4. Coloration: Many are brightly colored, which makes them popular in aquariums (e.g., neon tetras and cardinal tetras).
5. Habitat: They primarily inhabit freshwater rivers, streams, and lakes in tropical and subtropical regions.
6. Reproduction: Most characids are egg-layers, with a variety of reproductive strategies such as scattering eggs among vegetation or substrate.

Notable Genera in Characidae

• Paracheirodon: Includes species like the neon tetra.
• Pygocentrus: Piranhas, known for their sharp teeth and predatory behavior.
• Metynnis: Silver dollars, which are herbivorous and shaped like coins.
• Hemigrammus and Hyphessobrycon: Popular aquarium fish such as rummy-nose and ember tetras.