The red shiner or red-horse minnow (Cyprinella lutrensis) is a North American species of freshwater fish in the family Cyprinidae. They are deep-bodied and laterally compressed, and can grow to about three inches in length. For most of the year, both males and females have silver sides and whitish abdomens. Males in breeding coloration, though, have iridescent pink-purple-blue sides and a red crown and fins (except the dorsal fin which remains dark). Red shiners can live up to three years. They are omnivorous; they eat both aquatic and terrestrial invertebrates, as well as algae. Red shiners have also been known to eat the eggs and larvae of native fish found in locations where they have been introduced. Red shiners are found naturally in a variety of aquatic habitats, including backwaters, creek mouths, streams containing sand and silt substrates, riffles, and pools. The red shiner is naturally found in the Mississippi River basin from southern Wisconsin and eastern Indiana to South Dakota and Wyoming and south to Louisiana. It is also found as an introduced species in Arizona, Alabama, California, Colorado, Illinois, Georgia, Nebraska, North Carolina, South Carolina, Wyoming, Massachusetts, Utah, Virginia, Nevada, and New Mexico. Although the species is overall widespread and common, the subspecies from Maravillas Creek in Texas (Cyprinella lutrensis blairi) became extinct in the late 1950s due to competition from the invasive plains killifish. The red shiner is a common bait fish, and the emptying of bait buckets containing them is believed to be the main cause of introduction of this species into new areas. It is also commonly used as an aquarium fish. It has become a species of special concern in the United States, as it has been implicated in the decline of native fish populations in the areas where it has been introduced. As previously mentioned, red shiners have been known to eat the eggs of native fish and in doing so hinder the growth of those populations. They are also adapted to thrive in a variety of environments, and as generalists, may be better able to persist in disturbed habitats than native species of those areas. Red shiners are capable of hybridizing with the blacktail shiner (Cyprinella venusta stigmatura), a native species found in the Coosa River, which serves to dilute the gene pool of this species.
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