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The Red Shiner (Cyprinella lutrensis) is a small, freshwater ray-finned fish belonging to the family Cyprinidae. It is characterized by its vibrant coloration, especially during breeding season, and its adaptability to a wide range of aquatic environments. Native to the central United States and Mexico, it has become an invasive species in many other regions due to its hardiness and reproductive success. It plays a significant role in aquatic food webs as both a prey item and a consumer of small invertebrates and algae.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Body silvery, often with a dark lateral stripe. During breeding season, males develop brilliant red or orange coloration on the head, fins (especially caudal and anal fins), and sometimes the body. Tubercles (small bumps) also develop on the head and fins of breeding males. Females are typically duller, retaining a silvery-olive hue.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Vibrant red/orange coloration in breeding males, Dark lateral stripe, often with a wedge-shaped spot at the caudal fin base, Small, terminal mouth, Deeply forked caudal fin
- Dorsal fin
- Single dorsal fin, typically with 8 rays, originating slightly behind the pelvic fin origin.
- Tail fin
- Deeply forked caudal fin, often with red or orange coloration in breeding males.
- Pectoral fin
- Pectoral fins are relatively short, with 12-15 rays.
- Distinctive fins
- Anal fin typically has 9-10 rays, often with red or orange coloration in breeding males. Pelvic fins are small.
Identification Tips
Breeding Coloration
Look for intense red or orange on the head and fins of males during spring and summer. This is the most distinctive feature.
Lateral Stripe
Observe the dark lateral stripe running along the side of the body, often ending in a small, wedge-shaped spot at the base of the caudal fin.
Mouth Position
Note the small, terminal mouth, indicating its feeding habits on small prey and surface items.
Fin Ray Counts
For definitive identification, count the fin rays: dorsal fin typically 8, anal fin typically 9-10. This requires careful examination, often in a laboratory setting.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderate depths, often near the surface or in mid-water.
- Environment
- Highly adaptable, found in a wide variety of habitats including small streams, rivers, lakes, ponds, and reservoirs. Prefers areas with moderate current, often over sand, gravel, or rocky substrates. Tolerant of turbidity, fluctuating temperatures, and varying water quality. Often associated with aquatic vegetation or submerged structures for cover.
- Geographic range
- Native range extends from the Mississippi River basin west to the Rio Grande basin, encompassing parts of the central United States (e.g., Texas, Oklahoma, Kansas, Missouri, Arkansas, Louisiana) and northern Mexico. Introduced and established in many other states across the U.S. (e.g., Arizona, California, Colorado, Illinois, Indiana, Ohio, Pennsylvania, Virginia, West Virginia) and parts of Mexico, often through bait bucket releases.
Aquarium Information
- Care level: beginner
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 20 gallons
- Temperature: 60-78°F (15-26°C)
- pH level: 6.0-8.0
- Hardness: 5-20 dGH
- Compatibility: Generally compatible with other peaceful, similarly sized fish. Avoid housing with very small fry or highly aggressive species.
- Special requirements: Requires good water quality and prefers a planted tank with some open swimming space. Can be kept in schools of 6 or more individuals to reduce stress and encourage natural behavior.
Wild Information
- Conservation status: least concern
- Seasonality: Breeds primarily from spring to late summer, with peak activity in warmer months.
- Market price: Low (primarily baitfish)
- Commercial importance: low
- Taste: Not typically consumed by humans due to small size.
- Texture: Not typically consumed by humans due to small size.
- Nutritional value: Not typically consumed by humans due to small size.
Key Facts
Invasive Successinteresting
The Red Shiner is considered one of the most successful invasive freshwater fish in North America due to its high reproductive rate, adaptability, and tolerance to disturbed habitats.
Bait Bucket Introductionsbehavior
Many introductions of Red Shiners outside their native range are attributed to their use as baitfish, with individuals escaping or being released by anglers.
Hybridization Concernsevolution
In areas where it has been introduced, the Red Shiner can hybridize with native shiner species, potentially leading to genetic swamping and decline of native populations.
Breeding Tuberclesbehavior
Breeding male Red Shiners develop prominent nuptial tubercles on their head and fins, which are used during courtship and territorial displays.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to minimize stress to the fish. They are small and harmless.
Similar Species
Spotfin Shiner
Cyprinella spiloptera
The Spotfin Shiner typically has a prominent black spot on the posterior rays of the dorsal fin, which is usually absent or much less distinct in the Red Shiner. Breeding males of Spotfin Shiner also develop tubercles, but their coloration is generally less intensely red than Red Shiners, often with more yellow or orange hues.
Blacktail Shiner
Cyprinella venusta
Blacktail Shiners have a more pronounced and often larger black spot at the base of the caudal fin, and their lateral stripe is typically more distinct and continuous. Breeding males of Blacktail Shiners develop red coloration, but it is often concentrated on the lower fins and caudal fin, with less extensive red on the head compared to Red Shiners.
Pugnose Minnow
Opsopoeodus emiliae
The Pugnose Minnow has a distinctly upturned, small mouth (pugnose appearance) and a more compressed body. While it can have a lateral stripe, its overall body shape and mouth structure are quite different from the Red Shiner.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Cypriniformes
- Family
- Cyprinidae
- Genus
- Cyprinella
- Species
- lutrensis
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