Catfish, a diverse group of ray-finned fish, are distinguished by their barbels, which resemble a cat's whiskers. They are found in coastal and inland waters on every continent except Antarctica. The most varied catfish populations are in the tropical regions of South America, Asia, and Africa. Sizes and behaviors range from the Mekong giant catfish in Southeast Asia, the wels catfish in Eurasia, and the piraíba in South America, to bottom-feeding detritivores and the parasitic candiru. Not all catfish species have prominent barbels. Catfish are of significant commercial importance, with many larger species farmed or fished for food. They are also favored in aquariums, being available in various sizes and adaptable to most water conditions. Since most catfish lack scales, maintaining a clean tank is vital to prevent disease. An interesting trait of catfish is their ability to taste their environment while searching for food, due to thousands of taste buds on their skin. Water parameters for catfish can differ by species, but general guidelines for many include Temperature: 72°F to 82°F (22°C to 28°C), pH Level: 6.5 to 8.0 and Water Hardness: 4 to 19 dGH. Maintaining these conditions is essential for the health and well-being of catfish in captivity. It's crucial to research the specific requirements of your catfish species, as some may need different care. Regular water testing and maintenance help maintain ideal conditions for these aquatic pets.