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Goldfish

Goldfish

Goldfish (Carassius auratus) are an invasive freshwater species in Colorado, originally native to East Asia.

While not naturally occurring in Colorado waters, they have been documented in scattered locations throughout the state since their introduction through aquarium releases.

Scientific Name: Carassius auratus

Physical Characteristics:

These hardy cyprinids can grow much larger in the wild than their aquarium counterparts - reaching up to 16 inches and several pounds when unrestricted by tank size.

Wild goldfish typically display olive green to bronze coloration rather than the bright gold of domestic varieties.

What to know

Habitat Distribution

They have been documented in scattered locations throughout the state. Look for them in areas with aquatic vegetation where they browse for plant matter and small invertebrates.

Key Locations

Urban ponds and reservoirs that have experienced aquarium releases are most likely to harbor goldfish populations, though they've been documented in various Colorado watersheds including some Front Range locations.

Specific Spots

Target warm, shallow areas with soft substrate where they forage, including backwaters, ponds, and slow-moving river sections. Look for them in areas with aquatic vegetation. In winter, target deeper areas where they conserve energy.

Goldfish FAQ

Answers from onWater's species guide.

What are the best lures and bait for Goldfish in Colorado?

Small spinners, spoons, and jigs in yellow or natural colors work well for conventional tackle.

What flies work for Goldfish in Colorado?

For fly fishing, productive patterns include small yellow flies, basic shad patterns, and midge nymphs in sizes 14-18.

When is the best time to fish for Goldfish in Colorado?

Most productive during spring and early summer when they're actively feeding after winter. In winter, target deeper areas where they conserve energy, using smaller presentations fished slowly.

How do you catch Goldfish in Colorado?

Since goldfish have small mouths (about dime-sized), use appropriately sized offerings. The most critical technique is letting flies or lures drop - goldfish will show interest when you strip or jig in front of them, but they typically strike only when the offering pauses and sinks.

What do Goldfish eat?

They are omnivorous bottom feeders with voracious appetites, consuming algae, small invertebrates, aquatic plants, zooplankton, and detritus. Their feeding behavior involves constant foraging along the bottom, stirring up sediment which can degrade water quality.

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  1. 01 · Species map filter

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  2. 02 · Waterbody species

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  3. 03 · Angler Intelligence

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    Tactics, gear and timing from onWater's AI fishing guide, tuned to the species and the water you're on.

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Colorado licenses and regulations

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