The Obis catfish, scientifically known as *Pseudodoras niger*, is a freshwater fish native to the Amazon River basin in South America. It is recognized for its distinctive dark coloration and elongated body, which can grow up to 3 feet in length. This species is primarily nocturnal, preferring to hunt for food during the night. Obis catfish are bottom feeders, mainly consuming detritus, insects, and small fish. They play a vital role in their ecosystem by helping to maintain the balance of the aquatic environment. Due to their size and specific habitat needs, they are often kept in large aquariums by enthusiasts.