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1、SensitivityAnalysisoftheTrout.exeTroutStockingModelTheodoreJ.TreskaandPatrickJ.SullivanDepartmentofNaturalResourcesCornellUniversityIthaca,NY14853Abstract.--Thetroutpopulationdynamicsmodel,Trout.exe,developedbyCornellUniversityfortheNewYorkStateDepartmentofConservation(NYSDEC)isusedforthe
2、evaluationofstockingpracticesfortroutincoldwaterfisheries.Sensitivityanalyseswereconductedtodeterminetheinfluenceofmodelparametersonpopulationandanglercatchrateestimates.Variationinthemodeloutputwasexaminedbytrackingmodelpredictionsunderarangeofparametervalues.Outputsofpopulationabundance
3、andanglercatchratesweretrackedwhileparameterswereincreasedanddecreasedfromtheirdefaultvalues.Naturalmortalityrate,growthrate,age-specificcatchability,proportionoflegalfishkeptandreleasesurvival,stockinglevel,fishingintensity,andfishingeffortpatternwereallexamined.Themostinfluentialparamet
4、erswerefoundtobenaturalmortalityandtheproportionoflegalcatchkeptbyanglers.Thesefindingsidentifysourcesofuncertaintyinmodelpredictionsandtoprioritizewhereadditionaleffortmustbeplacedinrefiningpopulationandcatchrateestimates.INTRODUCTION2METHODS2ThePopulationModel,CatchRates,andDefaultParam
5、eters3NaturalMortality6GrowthRates7Age-SpecificCatchability7ProportionofLegal-sizedCatchKeptandReleaseSurvival8FishingIntensity9FishingEffortPatterns9RESULTS10NaturalMortality10GrowthRates13GrowthRates13Age-SpecificCatchability15ProportionofLegal-sizeCatchKeptandReleaseSurvival17FishingIn
6、tensity21FishingEffortPatterns21DISCUSSION21REFERENCES2130IntroductionThetroutpopulationdynamicsmodelTrout.exereliesheavilyuponasetofuserdefinedinputsandparameterstohelpcharacterizethedynamicsofstockedtroutpopulations.Theparametersexaminedincludenaturalmortalityandgrowthrateparameters,and
7、inputsonstockinglevel,age-specificcatchability,releasesurvivorship,fishingintensity,fishingeffortpattern,andproportionoflegalfishkept.Naturalmortality,growthrate,releasesurvivorshiplevelsandage-specificcatchabilitymustbeassumedknownorestimatedfromextantpopulations.S
