Common Carp

The common carp (Cyprinus carpio) is a large, adaptable freshwater fish native to rivers and lakes of Europe and Asia, now introduced widely across the world. It has a robust, deep body covered in large golden-bronze to olive scales, two pairs of sensory barbels near the mouth, and a long, continuous dorsal fin. Common carp are the wild ancestor of both ornamental koi and many domesticated food-fish strains, developed through centuries of selective breeding. Highly tolerant of poor water quality, low oxygen, and wide temperature ranges, the species thrives in still and slow-moving waters and is among the most widely distributed freshwater fish on Earth. In many introduced regions it is considered invasive due to its habit of stirring up sediment while feeding.

• Deep, robust body with large, rounded golden-bronze to olive-brown scales
• Two pairs of barbels on the upper lip, one short and one longer
• Long, continuous dorsal fin with a serrated leading spine
• Slightly subterminal (downward-angled), protrusible mouth for bottom feeding
• Look-alikes: goldfish and crucian carp lack barbels; koi are the same species in ornamental color forms; grass carp lack barbels and have a more elongated body

Common carp are native to slow-moving rivers, floodplain lakes, and warm lowland waters across Europe and Central Asia, but have been introduced to every continent except Antarctica, thriving in reservoirs, ponds, canals, and lakes worldwide. They tolerate a very wide range of conditions, including low oxygen, high turbidity, and temperature extremes, and prefer still or slow-flowing water with soft sediment and abundant vegetation. Carp can survive in water too degraded for many native fish, which has contributed to their establishment as an invasive species in parts of North America and Australia, where their bottom-feeding activity increases turbidity and disrupts aquatic plant communities.

Common carp are omnivorous bottom feeders, using their barbels to root through sediment for insect larvae, crustaceans, mollusks, plant matter, and detritus, often stirring up mud in the process. They are typically found in loose schools, becoming more solitary as they age and grow large. Spawning occurs in spring and summer when water warms, with females releasing large numbers of adhesive eggs over submerged vegetation, fertilized externally by one or more males in noisy, splashing groups; there is no parental care. Common carp are long-lived, sometimes reaching several decades of age, and grow continuously throughout their lives, making them one of the largest cyprinid fish. Their hardiness and adaptability have made them both a valued aquaculture species and a problematic invader.