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UNIVERSITY of WISCONSIN-LA CROSSE Graduate Studies FISH UNIVERSITY OF WISCONSIN-LA CROSSE Graduate Studies FISH HEALTH ASSESMENTS OF GREAT LAKES COREGONIDS A Manuscript Style Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in Biology Christopher M. Olds College of Science and Health Aquatic Science Concentration May, 2012 FISH HEALTH ASSESSMENTS OF GREAT LAKES COREGONIDS By Christopher M. Olds We recommend acceptance of this thesis in partial fulfillment of the candidate's requirements for the degree of Master of Science in Biology (Aquatic Sciences Concentration) The candidate has completed the oral defense of the thesis. A- r-1;)_ Date (-f--ZVIZ... Gregory Sanclt n , Ph.D. Date Thesis Committee Co-Chairperson .x IJ(..;{. 6/2 Roger H ro, P .D. I ate Thesis Committee Member 'd.--+ -J.o 12 Date Thesis Committee Member Thesis accepted 2 -"1~ -.?a/~ Robert H. Hoar, Ph.D. Date Associate Vice Chancellor for Academic Affairs ABSTRACT Olds, C. M. Fish health assessments of Great Lakes Coregonids. MS in Biology, May 2012, 70pp. (B. Lasee and G. Sandland) Health of Great Lakes coregonids is continuously monitored for the spread of pathogens because of their economic importance. An infectious disease and parasite survey was conducted to build on previous data collected in the past but to also examine other factors that may affect distribution of pathogens in Great Lakes lake whitefish, round whitefish, · and bloater populations. Coregonids (n=394) were collected from 3-4 regions in Lake Michigan, Lake Huron and Lake Superior and screened for target pathogens according to the procedures outlined in the AFS Blue Book Fish Health Section Inspection Manual. Parasite and age data were collected from a sub-sample (n = 2-30) of each fish species from each region sampled. No target viral pathogens were detected and one bacterial pathogen was detected in a lake whitefish from Western Lake Superior. A total of7,404 parasites were recovered representing 12 genera. Prevalence of infection ranged from 50% to 90% in each host species. Results indicate that host age and condition factor do not appear to influence the presence or absence of parasite communities of coregonids in the Great Lakes. iii ACKNOWLEDMENTS I would like to thank everyone at the United States Fish and Wildlife Service, La Crosse Fish Health Center for their patience and time as I learned a new part of the Region 3 Fisheries Program and for funding my research. Thank you Becky Lasee for bringing me into your facility and sharing your knowledge and passion for health of the Great Lakes and its fish species. I have learned so much from my experience with you and your office. I would like to thank all of my committee me.mbers: Dr. Becky Lasee, Dr. Gregory Sandland, Dr. Roger Haro, and Dr. Michael Hoffman for their time and patience as we worked through this process. Your encouragement and guidance is greatly appreciated. Thank you for sharing the passion you have in your subject areas and sharing it with me. I would like to thank Dr. Gregory Sandland and Dr. Sherwin Toribio for their patience and time explaining new statistical concepts to me. I would like to thank all the collecting agencies that took the time to individually package each fish and get the samples to me quickly. These agencies include: Alpena FWCO, Michigan Department ofNatural Resources (Marquette and Charlevoix Research Stations), Ontario Department ofNatural Resources, Chippewa Ottawa Resource Authority, Mackinaw Fish Company, Wilcox Fish Company, Wisconsin Department of Natural Resources, United States Geological Survey (Ashland Office). I would like to thank my friends and family for their guidance, support, and patience throughout my college career. I want to thank God for giving me the guidance and direction that I needed as I made big decisions for school and family. Lastly, I would lV like to thank my loving wife Jade for all her support and patience throughout my college career. v TABLE OF CONTENTS PAGE LIST OF TABLES ............................. ............. ...................... .. ...............viii LIST OF FIGURES .............. ...................................... ...... ........... ............ .x LIST OF APPENDICES .... ..... .............................................................. .... xiii INTRODUCTION ..................... ..... .................. ........................................ 1 Morphology and Habitat Preferences ........ ...... ... .. ......... .. .. ............. .... .... 2 Great Lakes Whitefish Status ................. ................... ... ....................... 3 Great Lakes Bloater Status ............... .................................................. .4 Coregonid Population Management Objectives .......................................... 4 Great Lakes Viral Pathogens ................ ...................... ... .. .. ....... .. ......... 5 Great Lakes Bacterial Pathogens ............... : ............. .... ... .. .................... 7 Great Lakes Parasite Fauna ................................................................ 8 Large-Scale Fish Parasite Sampling .... ....... ... ... .............................. : .. ... .. 9 Study Objectives ................ : ....................... ................. .. .. ... ... ......... 10 METHODS .................... ................... .. .. ........ ....................................... 11 Site Selection ...................................................... ..... ................ ... .11 Fish Collection .. ..................................................... ... .................. 12 Virology ....................................................... ............. ................ 14 Bacteriology .... .......................... ... .... .. .... ........ .. ............................ 14 Parasitology ... .... ...................... ..... .......... ... ......... ............ ........... 15 Statistical Analysis .................. ............................................... ....... 15 Vl PAGE RESULTS ......... .. .................................................................... ............. 17 Bacteriology and Virology ...... ... .. ..................................... .. ...... ........ 17 Parasitology ................................ .................. .. ................ ............. 17 Lake Whitefish .................................................. .................. :22 · Round Whitefish ............................ ... ..... ....... ...... .................. 26 Bloater. ..... .... ..... .. ..... .............. ............... .. .... .... ... ... ............ 31 Parasite abundances between host species .............................. .......36 DISCUSSION .............................................................. ......................... 39 REFERENCES ............................................. .. ....................................... 45 APPENDICES .................... ............. ........... ..... .. ............... ..................... 52 Vll LIST OF TABLES TABLE PAGE 1. Lake, sampling region, and collection dates of lake whitefish, round whitefish, and bloater collected from the Upper Great Lakes. Plus, the number of fish examined for target pathogens and the number of individuals examined for parasites with the mean length, weight, and depth of fish sampled from each region ........... .... .. .............. ..... .13 2. Infection prevalence, mean intensity(± S.D.) and the range of intensities for parasites found in lake whitefish (Coregonus clupeaformis) from sampling sites in Lake Superior. ..................................................... 20 3. Infection prevalence, mean intensity (±S.D.) and range of intensities for parasites found in lake whitefish from sampling sites in Lake Michigan and Lake Huron ...................... ...................... .... .. ... ........... ........... .. .21 4. Gender-based estimates of parasites and their abundances of lake whitefish using the Mann-Whitney U Test for significance ...................................... 26 5. Infection prevalence, mean intensity (± S.D.) and range of intensities found in round whitefish (Prosopium cylindraceum) from sampling sites in Lake Superior, Lake Michigan, and Lake Huron ..............................28 6. Gender-based estimates of parasites and their abundances of round whitefish using the Mann-Whitney U Test for significance ......................................31 7. Infection prevalence, mean intensity(± S.D.) and range of intensities found in bloater (Coregonus hoyi) from sampling sites in Lake Michigan and Lake Superior. ...................................................................................... 33 Vlll TABLE PAGE 8. Gender-based estimates of parasites and their abundances of bloater using the Mann-Whitney U Test for significance ................. .................. .......... 36 lX LIST OF FIGURES FIGURE PAGE 1. Sampling regions of A. Lake Michigan, B. Lake Huron, and C. Lake Superior using the Whitefish Management Units established by the U.S. vs. Michigan Consent Decree. Yellow rectangles indicating sampling regions within each of the three Great Lakes sampled ........................................................... .... ....................... 11 2. Photomicrograph of the posterior end of the nematode Cystidicolafarionis at 40x magnification. Nematode preserved in glycerin alcohol. ........ .......... ......... .. ................ .. .... .. ........ .. .. .... ....... 18 3. Photomicrograph of the acanthocephalan Acanthocephalus dirus with a protracted proboscis (Semi chon's acetic-carmine
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