Phycodurus

Phycodurus is a genus of small, freshwater fish belonging to the family Phycoduridae. These fish are native to South America, with species found in the Amazon and Orinoco river basins. Phycodurus species are known for their distinctive appearance, characterized by a long, slender body, a large mouth, and a single dorsal fin. They are typically small, with most species reaching lengths of less than 10 centimeters.

Phycodurus fish are omnivorous, feeding on a variety of small invertebrates and plant material. They are often found in slow-moving waters, where they can hide among vegetation or in the substrate. Phycodurus species are of particular interest to ichthyologists due to their unique reproductive behavior. Some species exhibit a form of mouthbrooding, where the male carries the eggs and young in his mouth until they are ready to hatch.

The genus Phycodurus includes several species, with the most well-known being Phycodurus eques. This species is known for its striking coloration, with a metallic green body and a distinctive black spot on the dorsal fin. Phycodurus eques is also notable for its unique reproductive behavior, as the male carries the eggs and young in his mouth until they are ready to hatch.

Phycodurus fish are not typically kept in aquariums due to their specific habitat requirements and the challenges associated with their reproductive behavior. However, they are of interest to researchers studying the evolution of reproductive behaviors in fish.