Bichir is a type of freshwater fish belonging to the family Polypteridae. They are primarily found in the rivers and lakes of Africa, particularly in regions like the Nile River and the Congo Basin. Bichirs are known for their elongated bodies, bony structures, and unique ability to breathe air through a modified swim bladder. These fish have a distinctive appearance, featuring a series of dorsal finlets that resemble a crest. Bichirs are carnivorous, feeding on smaller fish and invertebrates. They are popular in the aquarium trade due to their interesting looks and behaviors, making them a favorite among fish enthusiasts.