The scientific name is Anabas testudineus. Koi Fish typically ranges from 15 to 25 cm (6 to 10 inches) in length and weighs around 60 to 260 grams (3.5 to 7 ounces), though larger specimens can weigh more. Native to South and Southeast Asia, including Bangladesh, Koi Fish is used in traditional Bengali dishes and is commonly found in freshwater bodies in regions such as Sylhet, Dhaka, and Chattogram. It is locally known as Koi Mach.