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The Rosyside Dace (Clinostomus funduloides) is a small, slender freshwater fish belonging to the family Leuciscidae. It is characterized by its distinctive coloration, particularly the prominent rosy-red lateral stripe that becomes more vibrant in breeding males. This species is an active inhabitant of clear, cool, headwater streams and small rivers, often found in riffle and pool habitats with rocky or gravel substrates. It plays an important ecological role as both a predator of small invertebrates and a prey item for larger fish and wading birds.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Dorsal surface is typically olive to dark brown, fading to silvery-white on the belly. A prominent rosy-red to orange lateral stripe extends from the operculum to the caudal peduncle, most intense in breeding males. A dark lateral stripe often underlies the rosy stripe. Fins are generally clear to slightly yellowish, sometimes with reddish tints in breeding individuals.
- Scale type
- cycloid
- Mouth position
- superior
- Distinctive features
- Large, oblique mouth extending to or beyond the anterior margin of the eye., Prominent rosy-red lateral stripe, especially vibrant in breeding males., Slender, elongated body., Small, embedded scales.
- Dorsal fin
- Single dorsal fin, typically with 8 rays, originating slightly behind the pelvic fin origin.
- Tail fin
- Moderately forked caudal fin.
- Pectoral fin
- Pectoral fins are relatively long and pointed.
- Distinctive fins
- All fins are typically clear to slightly yellowish, sometimes with reddish hues during spawning.
Identification Tips
Mouth
The large, oblique mouth that extends to or beyond the anterior margin of the eye is a key diagnostic feature, distinguishing it from many other dace species.
Lateral Stripe
The prominent rosy-red to orange lateral stripe is highly characteristic, especially in breeding males. This stripe is typically bordered by a darker stripe below it.
Body Shape
Its slender, elongated body helps differentiate it from more robust dace species.
Scales
The scales are relatively small and often appear embedded, giving the fish a smooth appearance.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow waters (less than 1 meter) of streams and small rivers.
- Environment
- Prefers clear, cool, well-oxygenated headwater streams and small to medium-sized rivers with moderate to swift currents. Commonly found in riffles, runs, and pools over gravel, rubble, or bedrock substrates. Requires clean water and is sensitive to siltation and pollution.
- Geographic range
- Native to eastern North America. Its range extends from the Susquehanna River drainage in Pennsylvania south through the Appalachian Mountains to the Savannah River drainage in Georgia and South Carolina, and west to the upper Tennessee River drainage in Tennessee and Alabama. Isolated populations exist in some Atlantic slope drainages.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 20 gallons
- Temperature: 10-20°C (50-68°F)
- pH level: 6.5-7.5
- Hardness: 5-15 dGH
- Compatibility: Compatible with other small, peaceful, cool-water fish species such as other dace, shiners, and darters. Avoid housing with aggressive or large fish that may prey upon them.
- Special requirements: Requires a well-oxygenated tank with good water flow, mimicking its natural stream habitat. Provide plenty of hiding places with rocks, driftwood, and live plants. A fine gravel or sand substrate is preferred. Sensitive to poor water quality and high temperatures.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding occurs primarily in spring (April-June), with activity peaking when water temperatures are suitable. They are active year-round.
- Market price: N/A
- Commercial importance: none
- Taste: Not typically consumed due to small size.
- Texture: N/A
- Nutritional value: N/A
Key Facts
Breeding Colorsbehavior
During the breeding season, male Rosyside Dace develop intensely vibrant rosy-red coloration along their sides, making them particularly striking.
Mouth Adaptationbehavior
The large, oblique, and upward-pointing mouth of the Rosyside Dace is an adaptation for feeding on surface insects and aquatic invertebrates in the water column.
Habitat Indicatorinteresting
The presence of Rosyside Dace often indicates good water quality and healthy stream ecosystems, as they are sensitive to pollution and habitat degradation.
Nest Associatesbehavior
Rosyside Dace are known to be 'nest associates' or 'nest parasites' of other minnow species, laying their eggs in the nests of species like Creek Chubs (Semotilus atromaculatus) or Fallfish (Semotilus corporalis).
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions are required beyond standard care for small, delicate fish. Handle gently to avoid injury to the fish.
Similar Species
Redside Dace
Clinostomus elongatus
The Redside Dace (C. elongatus) has a more compressed body, a longer and more pointed snout, and the red lateral stripe is typically more intense and extends further onto the head. Its mouth is also large but generally does not extend as far back as in C. funduloides. C. elongatus also has a more northern distribution.
Mountain Redbelly Dace
Chrosomus oreas
Mountain Redbelly Dace (Chrosomus oreas) typically have two distinct dark lateral stripes, with red coloration (especially in breeding males) appearing between or below these stripes, rather than a single prominent rosy stripe. Their mouth is smaller and more terminal.
Southern Redbelly Dace
Chrosomus erythrogaster
Similar to Mountain Redbelly Dace, Southern Redbelly Dace (Chrosomus erythrogaster) also possess two dark lateral stripes and red coloration on the belly and lower sides, but lack the single prominent rosy stripe of the Rosyside Dace. Their mouth is also smaller and more terminal.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Cypriniformes
- Family
- Leuciscidae
- Genus
- Clinostomus
- Species
- Clinostomus funduloides
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