The Iwana fish, also known as the Japanese char, is a freshwater fish native to the cold rivers and lakes of Japan. It belongs to the Salmonidae family and is known for its vibrant colors, which can include shades of blue, green, and red. Iwana are popular among anglers and are often sought after for their delicate flavor. These fish thrive in clean, cold waters and are typically found at higher altitudes. Iwana are an important part of local ecosystems and are also featured in traditional Japanese cuisine, often served grilled or as sashimi.