BioInvasions Records (2014) Volume 3, Issue 4: 283–289 Open Access doi: http://dx.doi.org/10.3391/bir.2014.3.4.10 © 2014 The Author(s). Journal compilation © 2014 REABIC Rapid Communication Adult, juvenile and young-of-year bighead, Hypophthalmichthys nobilis (Richardson, 1845) and silver carp, H. molitrix (Valenciennes, 1844) range expansion on the northwestern front of the invasion in North America Cari-Ann Hayer*, Brian D.S. Graeb and Katie N. Bertrand South Dakota State University, Department of Natural Resource Management, Box 1240B, NPB 138, Brookings, SD 57006 USA E-mail:
[email protected] (CAH),
[email protected] (BDSG),
[email protected] (KNB) *Corresponding author Received: 2 June 2014 / Accepted: 14 August 2014 / Published online: 23 September 2014 Handling editor: Vadim Panov Abstract Asian carps (bighead and silver carp) were collected with boat electrofishing over four years in three South Dakota tributaries to the Missouri River at the beginning of their invasion into this region. This paper documents their annual movement upstream into these tributaries and identifies differences in distribution by age-0, juvenile, and adults. By the end of this study in 2012, Asian carps dispersion was slowed or halted in these tributaries due to artificial and natural barriers. These records represent the northern most records of Asian carps in North America (46.931042, -98.708975). Key words: South Dakota, prairie streams, flooding, establishment, reproduction Introduction through numerous dams on the Mississippi River and into associated tributaries (e.g., Missouri River, Invasive species are becoming a worldwide Illinois River, Ohio River; Kolar et al.