Skip to main content
U.S. flag

An official website of the United States government

Biological characteristics of the blue sucker in the James River and the Big Sioux River, South Dakota

January 1, 2003

Little is known about the relative abundance and biology of the blue sucker (Cycleptus elongatus), a species that may be declining in some parts of its range. We described the age, growth, condition, length distribution, and habitat preference of the blue sucker in two South Dakota rivers. Specimens were collected from the James River (n=74) and Big Sioux River (n=28) during the summer of 2000. Although five macrohabitats were sampled with electrofishing and hoopnets, most individuals were collected from riffle habitats and downstream of rock dams. Total length-weight relationships were log10 W= −6.14+3.37 (log10L) (r2 = 0.92) for blue suckers from the James River and log10 W= −6.52+3.50(log10L) (r2 = 0.97) for fish from the Big Sioux River. Mean condition factors (K = W(105)/L3) of blue suckers were 0.79 (SE = 0.07) for the James River and 0.73 (SE = 0.07) for the Big Sioux River. Blue suckers between 500 and 700 mm dominated length distributions (range = 374–717 mm) of both samples. Ages ranged from two to nine years, but six-year-old fish were captured most frequently. Blue suckers grew rapidly during juvenile stages (< age 5); however, growth slowed afterward.

Citation Information

Publication Year 2003
Title Biological characteristics of the blue sucker in the James River and the Big Sioux River, South Dakota
DOI 10.1080/02705060.2003.9663949
Authors N.M. Morey, C. R. Berry
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Freshwater Ecology
Series Number
Index ID 70025965
Record Source USGS Publications Warehouse
USGS Organization