Dr. Andrew Hafs

Assistant Professor

Office/Department: Biology

Location: Sattgast Hall 218A

Phone: (218) 755-2789

Box #: 27

Email: ahafs@bemidjistate.edu

Website: ResearchGate
Website: Google Scholar

Edit Your Contact Information


  • West Virginia University, PhD, 2011
  • Arkansas Tech University, MS, 2007
  • University of Wisconsin at Stevens Point, BS, 2005


Fall Semesters
  • BIOL 2610 General Ecology
  • BIOL 3361 Limnology I
  • BIOL 4545 Fisheries Management
  • BIOL 4894 Advanced Research Projects I
Spring Semesters
  • BIOL 1211 Introductory Biology II (even years)
  • BIOL 3554 Reading in Aquatic Biology (odd years)
  • BIOL 4534 Ichthyology
  • BIOL 4897 Advanced Research Projects II
  • Sci 6350 Computer Applications in Statistics (odd years)
Summer Semesters
  • BIOL 2339 Ethics of Fish and Wildlife Management

Research Interests

My research interests are focused on the interaction between animal populations and aquatic environments. Specifically, I enjoy researching the influence that anthropogenic factors have on movement patterns and population dynamics for species of interest. It is my hope that determining the influence of anthropogenic factors, as they relate to interaction between animals and their habitat, we will be better prepared to conserve and rehabilitate the aquatic environments studied.

Recent Work

Hartman, K.J., F.J. Margraf, A.W. Hafs, and M.K. Cox. In press. Bioelectrical impedance analysis: a new tool for assessing fish condition. Fisheries.

Hafs, A.W., and K.J. Hartman. 2015. Temperature corrections for bioelectrical impedance analysis models developed for age-0 and adult brook trout. Journal of Fish Biology 86:304-316.

Hafs, A.W., and K.J. Hartman. 2014. Developing bioelectrical impedance analysis methods for age-0 brook trout. Fisheries Ecology and Management 21:366-373.

Hafs, A.W., L.R. Harrison, R.M. Utz, and T. Dunne. 2014. Quantifying the role of woody debris in providing bioenergetically favorable habitat for juvenile salmon. Ecological Modelling 285:30-38.

Wilberding, M.C., and A.W. Hafs. 2013. Angler catch-per-unit-effort in restored and reference sections of the Merced River, California: a preliminary analysis. California Fish and Game 99:149-154.

Hafs, A.W., P.M. Mazik, P.B. Kenney, and J.T. Silverstein. 2012. Impact of carbon dioxide level, water velocity, strain, and feeding regimen on growth and fillet attributes of cultured rainbow trout (Oncorhynchus mykiss). Aquaculture 350-353:46-53.

Hafs, A.W. 2011. Bioelectrical impedance analysis methods for prediction of brook trout Salvelinus fontinalis percent dry weight. Dissertation. West Virginia University, Morgantown, WV.

Hafs, A.W., and K.J. Hartman. 2011. Influence of electrode type and location upon bioelectrical impedance analysis measurements of brook trout. Transactions of the American Fisheries Society 140:1290-1297.

Hafs, A.W., J.M. Niles, and K.J. Hartman. 2011. Efficiency of gastric lavage on age-0 brook trout and the influence on growth and survival. North American Journal of Fisheries Management 31:530-534.

Hafs, A.W., C.D. Horn, P.M. Mazik, and K.J. Hartman. 2010. Influences of acid mine drainage and thermal enrichment on stream fish reproduction and larval survival. Northeastern Naturalist 17:575:592.

Hafs, A.W., C.J. Gagen, and J.K. Whalen. 2010. Smallmouth bass summer habitat use, movement, and survival in response to low flow in the Illinois Bayou, Arkansas. North American Journal of Fisheries Management 30:604-612.

Hafs, A.W. 2007. Smallmouth bass survival, movement, and habitat use in response to seasonally discontinuous surface flow. Master’s thesis. Arkansas Tech University, Russellville, AR.

Undergraduate Research in BSU Journal of Student Research

DuFault, D. 2015. Abiotic habitat preferences of age-0 paddlefish in Lake Sakakawea, North Dakota during late summer.

Klingsheim, B.J. 2015. Influence of depth and retrieval speed on yellow perch barotrauma recovery time in winter.

Orgon, T. 2015. Juvenile Chinook salmon diet in comparison to invertebrate drift in the Merced River, California.

Spurbeck, A. 2015. Effects of cooler northern waters on growth rates in bluegill and pumpkinseed sunfish.

Zentner, D. 2015. A genetic based approach to management and stocking of muskellunge.

Zentner, D. 2015. Assessing the contributions of two stocked strains on a Minnesota-Wisconsin border water.

Carrow, R. 2014. The effects of angling pressure on northern pike size structure.

Longtin, K. 2014. Changing body condition in walleye with reference to ideal sample size requirements.

Oldenburg, C. 2014. Winter survival strategies of benthic invertebrates in temporary habitats in a northern Minnesota lake.

Powers, E. 2014. Defining the physiochemical, biological and habitat requirements for the upper extant of Oncorhynchus mykiss distribution.

Swenson, B.C. 2014. Effects of river current inflow on dissolved oxygen and temperature of refuge zones for cisco in Lake Bemidji.

VanderWeyst, D. 2014. The effect of barometric pressure on feeding activity of yellow perch.

Vaske, M. 2014. Use of cast nets and seine hauls to estimate abundance of age-0 yellow perch.

Skoog, M.L. 2013. Brown trout spawning location and relationship to suitable winter habitat.

Wilson, A. 2013. White bass assessment in regards to changes in water level on Lake Traverse.

Other Information

Graduate Students

Jake Graham (In Progress): Red Lakes walleye population dynamics

Emily Powers (In Progress): Bioelectrical impedance analysis of yellow perch

Ethan Karppinen (In Progress): Factors influencing the success of walleye fry stocking