Carassius auratus
Native to East Asia, goldfish have been introduced — mostly through aquarium releases — to freshwater systems across nearly every continent.
Wild specimens bear little resemblance to pet-store fish: they're olive-brown, thick-bodied, and built to survive conditions that would stress most native species. Catching one is a reminder of how quickly a backyard novelty becomes a bottom-grubbing invader.
Scientific Name: Carassius auratus
- Wild fish are olive brown to slate green — not orange — with a stout, thick-set body and a short, deep caudal peduncle.
- No barbels on the upper jaw, which separates goldfish from common carp; the scaleless head is broadly triangular.
- Long dorsal fin with 15–21 rays and serrated bony spines on both dorsal and anal fins; tail is forked.
- Most fish run 4–8 inches, but wild individuals can reach nearly 19 inches and reportedly up to 6 lbs in productive waters.
What to know
Habitat Distribution
- Native to China and Japan; now established across most of North America, Europe, Australia, and beyond — almost entirely through accidental or intentional release of aquarium fish.
- A generalist that thrives in slow-moving backwaters, ponds, lakes, and sluggish river pools, especially where submerged vegetation is present.
- Tolerates an extraordinary range of conditions: temperatures from near-freezing to 41°C, low dissolved oxygen, high turbidity, and pH anywhere from 4.5 to 10.5.
Specific Spots
- Schools in shallow, warm, weedy bays and backwaters where bottom sediment is soft and food is easy to root out.
- Quiet pools and slow eddies off the main current in rivers — anywhere the water slows enough for vegetation to take hold and detritus to accumulate.
Carassius auratus FAQ
Answers from onWater's species guide.
What are the best lures and bait for Carassius auratus?
Dough bait and corn are the go-to offerings, both mimic the soft, organic material goldfish root for along the bottom. Small worms or pieces of worm on a light bottom rig also produce, particularly where fish are actively feeding in shallow weedy areas.
What do Carassius auratus eat?
Bottom-rooting omnivore: eats insect larvae, planktonic crustaceans, fish eggs, algae, aquatic vegetation, and detritus, crushing harder items with pharyngeal teeth.
Where do Carassius auratus live?
Native to China and Japan; now established across most of North America, Europe, Australia, and beyond, almost entirely through accidental or intentional release of aquarium fish.
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