Scarlet Shiner - Lythrurus fasciolaris Fish Profile & Care Guide
Introduction
The Scarlet Shiner (Lythrurus fasciolaris) is a small, vibrant freshwater fish native to the cool, clear streams and rivers of the eastern United States. These fish are known for their striking colouration, particularly in males during the breeding season. Their active, peaceful nature makes them an excellent choice for community tanks with similarly temperate species. Scarlet Shiners prefer well-oxygenated, fast-flowing water, best suited to aquariums that replicate its natural stream environment, providing ample swimming space and consistent water movement.
The Scarlet Shiner is a peaceful freshwater species best suited for community tanks with similarly non-aggressive fish. Ideal tankmates include other small, temperate species such as darters, dace, or other shiners and species that thrive in cooler, well-oxygenated water. It is essential to avoid slow-moving or long-finned species, as the Scarlet Shiner's active nature and preference for flowing water might stress them.
Scarlet Shiners are a shoaling species and should be kept in groups of at least six to eight individuals to encourage natural behaviour and reduce stress. In the wild, they form large schools, and replicating this social dynamic in the aquarium enhances their well-being, as solitary individuals may become anxious or less active. Shoaling also brings out their vibrant colours and liveliness, especially in males during the breeding season.
To provide an optimal aquarium setup, mimicking their natural habitat of cool, clear, flowing streams is essential. A tank with a strong filter or powerhead is necessary to create sufficient water movement. Substrates should consist of sand or fine gravel, with scattered rocks and driftwood to simulate their native streambeds. While plants are unnecessary, a few hardy species can provide additional cover. Regular water changes and high oxygen levels are crucial to guarantee the health and vitality of Lythrurus fasciolaris in captivity.
Scarlet Shiners can be identified by the presence of four to eleven saddle bands or tiger-like stripes across their back and upper sides, a more prominent feature in males. Their bodies are slender and laterally compressed, giving them a streamlined appearance. They also possess fewer anal fin rays, typically ranging from nine to eleven. Outside the breeding season, both males and females retain a silvery-blue colouration, along with the species' typical cryptic patterning darker on the dorsal side and transitioning to a lighter white or cream-coloured belly, helping them blend into their environment.
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Sexual Dimorphism
Scarlet Shiners derive their name from the striking colouration of breeding males, which display a vibrant red across their dorsal, caudal, pelvic, anal, and pectoral fins. The dorsal fin is often marked by a dark blotch at the front of its base. In contrast, females and non-breeding males exhibit more subdued colouration, with only faint red tinges on their fins. During the breeding season, males also form small tubercles on their heads, further distinguishing them from females and non-breeding individuals.
Quick Facts
| Scientific Name | Lythrurus fasciolaris |
|---|---|
| Year Described | 1996 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Cypriniformes |
| Family | Cyprinidae |
| Genus | Lythrurus |
| Origins | United States |
| Approx Max Size | 9 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 3 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 7.5 |
| GH | 5 - 15 |
| ℉ | 64 - 72 |
|---|---|
| ℃ | 18 - 22 |
Natural Habitat
Scarlet Shiners thrive in subtropical, benthopelagic freshwater environments, particularly in clear, fast-flowing waterways with coarse substrates such as rocks, pebbles, or gravel. They are commonly found in higher-gradient streams, primarily within the Ohio River basin, but their range extends as far south as Eagle Creek in Kentucky. They are prevalent in the southwestern regions of Ohio, including the Scioto River and westward toward the Little River basin in Tennessee. Their habitat also connects to the Tennessee River, flowing into northern Alabama and reaching parts of West Virginia and Virginia. Additionally, Scarlet Shiners inhabit the Cumberland drainages in Kentucky and Tennessee and areas in Alabama, Mississippi, and Georgia.
These fish prefer small to medium-sized streams with clear water and moderate current flow, though they can tolerate slightly murky water. However, they are susceptible to poor water quality, such as high turbidity, siltation, and low dissolved oxygen levels. Excessive silt or sediment can reduce oxygen levels, detrimental to the fish and their eggs. During the winter months, scarlet shiners often move to deeper, calmer pools to seek refuge from the colder conditions.
Breeding
Scarlet Shiners are seasonal breeders, typically spawning in late spring to early summer when water temperatures rise to around 20°C to 24°C (68°F to 75°F). They are egg scatterers, meaning females release eggs over gravel or rocky substrates without creating a specific nest. Males become more territorial during the breeding season, displaying brighter colours to attract females and defend spawning sites. Courtship often involves the male chasing the female to a suitable location, where the eggs are scattered and fertilized.
Unlike some other species, Scarlet Shiners do not provide parental care; once the eggs are deposited, the male and female move on, leaving the eggs to develop independently. Depending on the water temperature, the eggs generally hatch within a few days, and the fry begins feeding on microscopic organisms soon after. To ensure higher fry survival in captivity, a separate breeding tank with fine gravel and well-oxygenated water is recommended, along with removing the adults post-spawning to prevent egg predation.
Diet & Feeding
Scarlet Shiners are omnivorous and have a varied diet in their natural habitat, feeding on small invertebrates, algae, and organic detritus. In an aquarium setting, they readily accept a range of foods, making them easy to care for in terms of feeding. A balanced diet should include high-quality flake foods, small pellets, and live or frozen options such as daphnia, brine shrimp, and bloodworms. Supplementing their diet with plant-based foods, such as spirulina-based flakes, ensures proper nutrition and supports their vibrant colouration. Feeding them small amounts once or twice daily is important, providing only what they can devour within a few minutes to maintain water quality and avoid overfeeding. This varied diet helps to replicate their natural feeding habits and promotes their health and vitality in captivity.
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Published: 16 Oct 2024
Last Updated: 17 Oct 2024