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Life History Traits and Status of a Peripheral Redside Dace (Clinostomus elongatus) Population in Minnesota

Abstract Redside dace Clinostomus elongatus in Minnesota represent genetically unique peripheral populations on the extreme western edge of their native range with uncertain population status. Electrofishing surveys were conducted in 2017 in the Little Cannon River watershed to ascertain life history traits (e.g., age, growth, reproductive traits) for comparison to core populations in eastern North America and to assess population status. Minnesota redside dace grew faster but lived shorter lives than their core populations/counterparts. Females matured at age-2 and about 80 mm total length and males at age-1 and 70 mm. Females produced up to 962 eggs. Estimated population size for age 1+ dace was 9251 (95% C.I. 8300–10,201) and for age 2+ was 6600 (95% C.I. 5789–7411). These values exceeded a demographic minimum viable population estimate of 3305 (nearly double) suggesting that redside dace should persist in this watershed for at least the next two decades (until ≈ 2040).