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Management of Undesirable Fish Species Chapter 15

Management of Undesirable Fish Species Chapter 15. Undesirable Species. Any species that does not meet human needs. Undesirable Species. Not contribute to sport fishery, forage base Inhibit development, maintenance of desirable fish Detrimental to biological balance. Undesirable Species.

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Management of Undesirable Fish Species Chapter 15

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  1. Management of Undesirable Fish SpeciesChapter 15

  2. Undesirable Species • Any species that does not meet human needs

  3. Undesirable Species • Not contribute to sport fishery, forage base • Inhibit development, maintenance of desirable fish • Detrimental to biological balance

  4. Undesirable Species • Reservoir for pathogenic organisms (aquaculture) • Interfere with other wildlife management practices

  5. Most Control Efforts • Herrings (gizzard shad) • Minnows (common carp) • Sunfish • Suckers • Bullhead catfishes

  6. Control Methods • Chemical • Biological • Mechanical

  7. Chemical Control • Usually used for complete removal • Also effective for partial removals • Spawning sites • Lake sections • “Thinning” of stunted game fish stocks

  8. Ideal Chemical • Species-specific • Easy/safe to apply • Quickly degrades to harmless form without need for detoxicants • Harmless to nontarget organisms

  9. Ideal Chemical • Effective across range of water quality • Registered for aquatic use • NO SUCH CHEMICAL!

  10. Current Registered Piscicides • Rotenone and antimycin • General fish toxicants

  11. Current Registered Piscicides • TFM and Bayluscide • Lampricides

  12. Lampricides Sea lamprey Larva or ammocoete

  13. Lampricides Larva or ammocoete Granular Bayluscide

  14. Chemical Control • Effective time period - 1 to 15 years most common • Some up to 30 years

  15. Biological Control • Predators to control forage, stunted fish

  16. Problems: Gizzard shad Yellow perch “Sunfish” Common carp Other minnows Solutions: Largemouth bass Walleye Northern pike Striped bass Striped bass hybrids Muskellunge Biological Control

  17. Biological Control • Controlling reproduction • Forage fish introductions • Unwanted competitive interactions • Underexploited fishes • Encourage new sport, commercial fisheries

  18. Mechanical Control • Water level manipulations • Only on reservoirs

  19. Traps Barriers Commercial fishing Electricity Labor-intensive - CPUE declines with decreasing populations Problems: Common carp Other minnows Suckers “Sunfish” Yellow perch Mechanical Control

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