Red Shiner

Adults reach 7–9 cm in length. Several regional colour variants exist. The most recognizable form has a bright red belly and fins with a blue-tinted body. During spawning, males develop distinctive white tubercles on the head; these disappear after spawning ends. This is common in cyprinids.

The Red Shiner is widespread across North America, occurring in the Mississippi River basin and other waterways of the USA and northern Mexico. It inhabits diverse conditions: small streams with fast current, lakes, canals and ponds. The fish prefers sandy or silty bottoms and often lives in turbid water. It tolerates unstable environments with seasonal fluctuations in flow and water chemistry.

This is a schooling species that requires a group of at least 8–10 individuals. Kept in smaller numbers or alone, the fish become timid. They coexist well with other peaceful, cool-water fish.

The Red Shiner is undemanding about tank conditions. It can live in outdoor ponds in warm months or in unheated home aquariums. Ideal conditions include slightly alkaline water of moderate hardness at 15–25°C. A group of 8–10 needs at least 250 litres. The tank can be arranged in any style, but must provide open swimming space and shelter formed by driftwood or dense vegetation suited to cool water. Weekly partial water changes with substrate cleaning form the basic maintenance routine.

This is an omnivorous species. Although the Red Shiner can be trained to accept dry foods, live or frozen foods are preferable for daily feeding: brine shrimp, bloodworm, daphnia and similar items.

Spawning occurs from spring through autumn, peaking in mid-summer. These fish are egg-scatterers; males actively guard territories around crevices in rocks or substrate where females deposit eggs. Eggs may also be laid on plants. Females release multiple batches of eggs during the season. Parental care does not occur; fry develop independently.

The species is hardy in nature but sensitive to water quality in the aquarium. High concentrations of nitrogenous compounds (ammonia, nitrites, nitrates) and phosphates are the main cause of disease and death. Prevention includes regular water changes, effective aeration and filtration, and regular water testing.

When buying, select active, vigorous individuals with clean fins and an undamaged body. Avoid fish showing lethargy or pale colour, signs of poor conditions or stress. Since the fish tend to jump, the aquarium must have a tight-fitting lid both during transport and in permanent setup.