Carassius auratus auratus, commonly known as the goldfish, is a freshwater fish known for its vibrant orange coloration, although it can also display a variety of other colors. It thrives in calm waters such as ponds and slow-moving rivers. Goldfish are social, often swimming in groups, and are highly adaptable, which contributes to their widespread domestication. They are known for their keen senses of smell and sight, which aid in their foraging behavior.

Carassius auratus auratus, commonly known as the goldfish, is native to East Asia, with its origins traced back to China. Over time, it has been introduced to many parts of the world, but its native range primarily includes the subtropical regions of China.

Goldfish are typically found in slow-moving, freshwater environments such as ponds, lakes, and rivers. They thrive in waters with a moderate temperature range of 20°C to 23°C (68°F to 73°F), although they can tolerate a broad temperature range. The water is often calm, with a low current and abundant vegetation.

Goldfish occupy a niche as omnivorous bottom feeders in their aquatic habitats. They consume a variety of food sources including algae, small crustaceans, insect larvae, and plant matter. Their adaptability to various environmental conditions has allowed them to thrive in diverse habitats, although they are most successful in environments that provide ample cover and food resources.