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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 Reservoir for pathogenic organisms (aquaculture) Interfere with other wildlife management practices
Most Control Efforts Herrings (gizzard shad) Minnows (common carp) Sunfish Suckers Bullhead catfishes
Control Methods Chemical Biological Mechanical
Chemical Control Usually used for complete removal Also effective for partial removals Spawning sites Lake sections “Thinning” of stunted game fish stocks
Ideal Chemical Species-specific Easy/safe to apply Quickly degrades to harmless form without need for detoxicants Harmless to nontarget organisms
Ideal Chemical Effective across range of water quality Registered for aquatic use NO SUCH CHEMICAL!
Current Registered Piscicides Rotenone and antimycin General fish toxicants
Current Registered Piscicides TFM and Bayluscide Lampricides
Lampricides Sea lamprey Larva or ammocoete
Lampricides Granular Bayluscide
Chemical Control Effective time period - 1 to 15 years most common Effective time period - 1 to 15 years most common Some up to 30 years Some up to 30 years
Biological Control Predators to control forage, stunted fish Predators to control forage, stunted fish
Biological Control Problems: Problems: Gizzard shad Gizzard shad Yellow perch Yellow perch “Sunfish” “Sunfish” Common carp Common carp Other minnows Other minnows Solutions: Largemouth bass Walleye Northern pike Striped bass Striped bass hybrids Muskellunge
Biological Control Controlling reproduction Forage fish introductions Unwanted competitive interactions Underexploited fishes Encourage new sport, commercial fisheries
Mechanical Control Water level manipulations Only on reservoirs
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