Dr Andrew Hafs

Photo of Dr Andrew Hafs

Associate Professor

Office/Department: Biology

Location: Sattgast Hall 218A

Phone: (218) 755-2789

Box #: 27

Email: ahafs@bemidjistate.edu

Website: ResearchGate
Website: Google Scholar

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


Fall Semesters
  • BIOL 3361 Limnology
  • BIOL 4545 Fisheries Management
  • BIOL 4898 Fisheries Research I
Spring Semesters
  • BIOL 1211 Introductory Biology II
  • BIOL 4534 Ichthyology
  • BIOL 4899 Fisheries Research II
  • Sci 6350 Computer Applications in Statistics
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

Studinski, J.M., A.W. Hafs, J.M. Niles, and K.J. Hartman. 2017. The effects of riparian disturbance on the condition and summer diets of age-0 brook trout (Salvelinus fontinalis) in three central Appalachian streams. Canadian Journal of Fisheries and Aquatic Sciences 74:980-986.

Graham, J.D., A.W. Hafs, and A.J. Kennedy. 2017. Quantification of walleye spawning substrate in a northern Minnesota river using side-scan sonar. North American Journal of Fisheries Management 37:420-428.

Hafs, A.W., and K.J. Hartman. 2017. Seasonal changes in condition of Appalachian brook trout. North American Journal of Fisheries Management 37:196-206.

Hartman, K.J., F.J. Margraf, A.W. Hafs, and M.K. Cox. 2015. Bioelectrical impedance analysis: a new tool for assessing fish condition. Fisheries 40:590-600.

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

Henry, R. 2017. Effect of abiotic factors on Bluegill size structure in nine central Minnesota lakes.

Knutson, C. 2017. Influence of time spent in captivity on aggressive behaviors of gray wolves Canis lupus.

Lamb, W. 2017. Minnesota fish taxonomic key.

Peterson, S.J. 2017. Burbot growth rates in a northern mesotrophic lake.

Robinson, T. 2017. Effects of catch-and-release angling on egg densities in Largemouth Bass nests.

Tuckett, D. 2017. Relationship between zooplankton and Walleye rearing pond success.

Varela, W. and Z. Buckley. 2017. Redd habitat selection for Brook Trout in the Necktie River Bemidji, MN.

Oswald, P. 2016. Survival of Walleye eggs in Upper Red Lake and the Tamarac River.

Evans, M. 2015. Using Wild I.D. as a reliable source for mark and recapture studies on Northern Pike (Esox lucius).

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.

Stott, N. 2015. Spatial and temporal factors influencing Northern Pike fry density estimates.

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

Ethan Karppinen (In Progress-Started August 2014): Factors influencing the success of walleye fry stocking

John Kempe (In Progress-Started January 2016): Factors influencing population dynamics of the northern pike in Shingobee Lake

Steve Hauschildt (In Progress-Started January 2016): Validation of hatch dates and daily growth of yellow perch

Kathryn Renik (In Progress-Started August 2016) Improving native brook trout stream habitat through beaver management

Phil Oswald (In Progress-Started August 2016) Assessing the importance of walleye fry inputs from the Tamarac River

Heather Marjamaa (In Progress-Started January 2017) OTC based assessment of Walleye stocking in Cass Lake Chain.

Emily Powers (August 2014-March 2017): Estimating seasonal variation in condition of yellow perch

Jake Graham (January 2014-April 2016): Assessment of American white pelican predation and reproductive success of walleye in the Tamarac River, MN