Date post: | 15-Dec-2015 |
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Undesirable SpeciesUndesirable Species
Any species that Any species that does not meet does not meet human needshuman needs
Undesirable SpeciesUndesirable Species
Not contribute to Not contribute to sport fishery, sport fishery, forage baseforage base
Inhibit Inhibit development, development, maintenance of maintenance of desirable fishdesirable fish
Detrimental to Detrimental to biological balancebiological balance
Undesirable SpeciesUndesirable Species
Reservoir for Reservoir for pathogenic pathogenic organisms organisms (aquaculture)(aquaculture)
Interfere with Interfere with other wildlife other wildlife management management practicespractices
Most Control EffortsMost Control Efforts
Herrings (gizzard Herrings (gizzard shad)shad)
Minnows (common Minnows (common carp)carp)
Sunfish Sunfish Suckers Suckers Bullhead catfishesBullhead catfishes
Chemical ControlChemical Control
Usually used for Usually used for complete removalcomplete removal
Also effective for Also effective for partial removalspartial removals Spawning sitesSpawning sites Lake sectionsLake sections ““Thinning” of Thinning” of
stunted game fish stunted game fish stocksstocks
Ideal ChemicalIdeal Chemical
Species-specificSpecies-specific Easy/safe to applyEasy/safe to apply Quickly degrades Quickly degrades
to harmless form to harmless form without need for without need for detoxicantsdetoxicants
Harmless to Harmless to nontarget nontarget organismsorganisms
Ideal ChemicalIdeal Chemical
Effective across Effective across range of water range of water qualityquality
Registered for Registered for aquatic useaquatic use
NO SUCH NO SUCH CHEMICAL!CHEMICAL!
Current Registered Current Registered PiscicidesPiscicides
Rotenone and Rotenone and antimycinantimycin
General fish General fish toxicantstoxicants
Current Registered Current Registered PiscicidesPiscicides
TFM and TFM and BayluscideBayluscide
LampricidesLampricides
Chemical ControlChemical Control
Effective time Effective time period - 1 to 15 period - 1 to 15 years most years most commoncommon
Some up to 30 Some up to 30 yearsyears
Biological ControlBiological Control
Predators to Predators to control forage, control forage, stunted fishstunted fish
Biological ControlBiological Control
Problems:Problems: Gizzard shadGizzard shad Yellow perchYellow perch ““Sunfish”Sunfish” Common carpCommon carp Other minnowsOther minnows
Solutions:Solutions: Largemouth bassLargemouth bass WalleyeWalleye Northern pikeNorthern pike Striped bassStriped bass Striped bass Striped bass
hybridshybrids Muskellunge Muskellunge
Biological ControlBiological Control
Controlling Controlling reproductionreproduction
Forage fish Forage fish introductionsintroductions Unwanted Unwanted
competitive competitive interactionsinteractions
Underexploited Underexploited fishesfishes Encourage new sport, Encourage new sport,
commercial fisheriescommercial fisheries
Mechanical ControlMechanical Control
Water level Water level manipulationsmanipulations
Only on reservoirsOnly on reservoirs
Mechanical ControlMechanical Control
TrapsTraps BarriersBarriers Commercial fishingCommercial fishing ElectricityElectricity
Labor-intensive - Labor-intensive - CPUE declines CPUE declines with decreasing with decreasing populationspopulations
Problems:Problems: Common carpCommon carp Other minnowsOther minnows SuckersSuckers ““Sunfish”Sunfish” Yellow perchYellow perch