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Rosyside Dace
Fish Active during the day

Rosyside Dace

Clinostomus funduloides

iNaturalist Wikipedia

A hidden gem of Appalachian streams, the Rosyside Dace is a small fish with a big personality. Known for its vivid red breeding colors and acrobatic hunting style, it is a favorite for backyard stream enthusiasts.

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Quick Identification

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Size

6.5 to 11.5 cm (2.5 to 4.5 inches) in length

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Colors

Olive to brownish-green back with a dark lateral stripe; males develop vibrant rosy-red or pink sides during the spring breeding season

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Key Features

  • Unusually large, upturned mouth for a minnow
  • Dark lateral stripe running from snout to tail
  • Deep-bodied, compressed profile
  • Rosy-red coloration on the front half of the body in males
  • Relatively large eyes
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When You’ll See Them

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Activity pattern Active during the day
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Peak hours 9 AM - 5 PM
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Season April-June (for breeding colors)
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Diet Primarily insectivorous, feeding on terrestrial insects that fall on the water surface and aquatic larvae such as mayflies and midges.
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Habitat Cool, clear headwater streams and small rivers with rocky or gravelly bottoms and moderate flow.

public Geographic range

Where Does the Rosyside Dace Live?

Native to the North American continent, the Rosyside Dace is found exclusively within the eastern United States. Its primary range extends from the Susquehanna River drainage in Pennsylvania and New York southward through the Appalachian highlands to the Savannah River in Georgia. It is also found in the Tennessee and Ohio River basins, particularly in the clean, high-gradient streams of the Piedmont and Mountain regions.

Basemap © OpenStreetMap contributors

1 Countries
450K km² Range
Least Concern Conservation
US United States
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iNaturalist / Verified observation data
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Behavior

The Rosyside Dace is a highly active, schooling minnow that spends much of its time in the middle and upper layers of the water column. Unlike many of its relatives that scavenge the bottom, this species is a keen visual predator. They are frequently seen 'darting' toward the surface to capture falling insects or mid-water larvae, exhibiting a level of agility more common in larger trout.

During the spring, these fish display complex social behaviors centered around spawning. They are famous 'nest associates,' meaning they don't build their own nests but instead use the gravel mounds constructed by larger fish like Chubs or Fallfish. This relationship is fascinating to watch, as dozens of brightly colored dace will hover over a single nest, waiting for the opportunity to deposit their eggs alongside the host's.

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Camera Tips

To capture high-quality footage of Rosyside Dace, an underwater action camera (like a GoPro) is essential. Place the camera in a clear, shallow pool just downstream from a riffle. This 'tail-out' area is where dace congregate to intercept food being washed down by the current. Use a small weighted tripod or a lead-weighted base to keep the camera steady against the flow; even moderate current can cause vibrations that blur the image.

Lighting is the most critical factor for underwater fish photography. Position your camera so the sun is behind it or directly overhead to illuminate the fish's sides. Because these fish are shiny, direct midday sun can create harsh reflections, so slightly overcast days or morning hours can often produce a softer, more natural look that highlights the red hues of the males. If your camera allows for it, a polarizing filter can help remove the 'shimmer' from the water's surface if you are filming from a high angle.

Rosyside Dace are curious but cautious. After placing the camera, leave the area for 15-20 minutes to allow the school to return to their natural behavior. You can encourage them to stay in the frame by 'chumming' slightly—drop a few small pieces of fish food or freeze-dried bloodworms into the current upstream so they drift directly in front of the lens. Use a high frame rate (at least 60fps) because these fish move incredibly fast; slow-motion playback is often the only way to see their lightning-quick strikes at the surface.

Similar Species

Species that look similar or are commonly confused with Rosyside Dace.

Redside Dace

Has a smaller mouth and the red coloration typically extends further back along the body than the Rosyside.

Bluehead Chub

Much larger and more robust; males have a bulbous blue head with tubercles rather than rosy-red sides.

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Frequently Asked Questions

Rosyside Dace are strictly diurnal, meaning they are active during the day. They rely on their eyesight to hunt insects, so they are most visible from mid-morning to late afternoon when the sun illuminates the water.
Maintain a healthy, shaded stream environment with plenty of overhanging vegetation. They are attracted to 'drift,' so avoiding pesticides helps ensure a steady supply of the insects they love to eat.
They are insectivores. Their diet consists of aquatic larvae like caddisflies and mayflies, as well as terrestrial insects like ants, flies, and beetles that fall onto the water's surface.
They can be found in suburban streams if the water remains cool, clear, and unpolluted. However, they are sensitive to siltation and runoff, so they are often replaced by hardier species in heavily developed areas.
Rosyside Dace have a much larger mouth that reaches back to the level of the eye, whereas the Redside Dace has a smaller mouth. Additionally, the red color on Rosyside Dace is usually more concentrated on the front half of the body.

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