The Black Ear Pangasius Catfish (Pangasius larnaudii) is a freshwater fish native to Southeast Asia, particularly found in the Mekong and Chao Phraya river basins. This species is known for its distinctive black marking near the base of its pectoral fins, which resembles an ear, hence the name. It can grow quite large, reaching up to 3 feet in length, and has a sleek, silver-gray body. These catfish are popular in the aquarium trade for their unique appearance and active swimming behavior, but they require ample space and proper care due to their size and rapid growth.