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Gizzard Shad

Gizzard Shad

Gizzard Shad are non-native fish in Colorado, first documented in 1952 with observations through 2012 across 16 hydrologic units. Colorado classifies them as game fish and allows their commercial harvest.

Scientific Name: Dorosoma cepedianum

Physical Characteristics:
  • Deep-bodied, laterally compressed fish that reach up to 20 inches and are characterized by a blunt snout, small toothless mouth, long trailing dorsal ray, and closely packed gill rakers.

What to know

Habitat Distribution

  • Prefer large rivers, reservoirs, and lakes with open water.

Key Locations

  • Found throughout the state in major river drainages including the Big Thompson, Cache La Poudre, Colorado Headwaters, South Platte system, Arkansas River drainage, and numerous reservoirs like Barr Lake, Cherry Creek Reservoir, Boulder Reservoir, Chatfield Lake, Horsetooth Reservoir, and Bear Creek Lake.

Specific Spots

  • Target backwater bays and coves with relatively deep channels leading to shallow areas, especially those with culverts providing moving water and nutrients.
  • Best locations are back areas of lakes and reservoirs that shallow out significantly.

Gizzard Shad FAQ

Answers from onWater's species guide.

When is the best time to fish for Gizzard Shad in Colorado?

Fish are found in target areas year-round, though fall and winter concentrations increase as water temperatures drop and baitfish move to back coves. Avoid fishing during spawning periods (typically mid-April through May).

How do you catch Gizzard Shad in Colorado?

Cast net fishing. Throw cast nets away from the wind for better opening and distance. Can also be taken by seining, underwater spearfishing, archery, and gigs east of the Continental Divide.

What do Gizzard Shad eat?

Omnivorous filter feeders that consume phytoplankton, zooplankton, algae, organic sediments, and detritus using their specialized gill rakers.

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Colorado licenses and regulations

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