Northern Redbelly Dace

Fascinating facts about the Northern Redbelly Dace

• When the water warms to 21-27 °C, the dace drops non-adhesive eggs into filamentous algae and the next generation hatches in just eight to ten days. Such rapid development lets the species quickly repopulate the quiet margins of lakes and streams each summer.
• During breeding, males display a brilliant red belly while females show a vivid green ventral stripe, contrasting with their usual white, yellow, or silver sides.
• The fish is listed as vulnerable in places like Nebraska, Colorado, and South Dakota, where cold-water habitats similar to those from about 1,000 years ago have been reduced.

At a glance

About the Northern Redbelly Dace

The northern redbelly dace (Chrosomus eos) glides through the cool, quiet streams and spring-fed lakes of the northeastern United States and eastern Canada, its iridescent silver back flashing beneath two dusky, longitudinal stripes. At 2-4 inches long, its slender body is cloaked in almost invisible scales, while the lower sides shift from pale white or yellow to a brilliant red in breeding males, a flash of color that rivals the sunrise on the water’s surface. Females counter with a subtle green ventral stripe, and both sexes display soft-rayed pectoral and pelvic fins that shimmer in muted silver tones. The fish’s incomplete lateral line, 70 to 90 scales long, and a black peritoneum are key clues for the observant eye, while its long, coiling intestines hint at a diet dominated by filamentous algae and diatoms.

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