see text under Taxonomy The scarlet shiner (Lythrurus fasciolaris) is a freshwater fish native to the eastern United States.

[2] Scarlet shiners get their name from the bright coloration of breeding males, who display a vibrant red on their dorsal, caudal, pelvic, anal, and pectoral fins.

[5] Scarlet shiners thrive in waterways that have clear water, and they tend to occupy the higher gradient streams with coarser substrates.

Typically, the scarlet shiner's habitat is situated around the Ohio River basin, but they range down as far as Eagle Creek in Kentucky.

[8] Scarlet shiners inhabit small to medium-sized sluggish to clear-water streams where the substrate is coarser, such as rocks, pebbles, or gravel, with medium current flow.

Abundance of scarlet shiners populations reduce when silt deposits from human development of land near their streams are above their tolerance levels.

Introduction of invasive species, like rainbow trout, to various streams by humans have caused for decline or fragmentation of scarlet shiner populations across their geographical distribution.

[1] Scarlet shiners are seasonal spawners that spawn once throughout the late spring and summer months over clean sand or fine gravel substrates[3] in faster currents of riffles and pools.

[1] Siltation of stream waters also decreases the number of scarlet shiners since heavy silt can suffocate their eggs, reducing their reproductive success.

States with scarlet shiner populations have begun actively researching the species to collect more data on it, such as Kentucky and Ohio, where they are native and introduced respectively.

The type species for the genus Lythrurus is Semotilus diplemia[12] but when you follow the synonymy of this name then it is currently recognised as a synonym of Chrosomus erythrogaster.