u.s. department of the interior u.s. geological survey general principles of telemetry studies...
TRANSCRIPT
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U.S. Department of the InteriorU.S. Geological Survey
General Principles General Principles of Telemetry Studiesof Telemetry Studies
Theresa L. Liedtke
Western Fisheries Research Center Columbia River Research Laboratory
Surgical Techniques Workshop, September 4, 2011
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Workshop Approach
Recently completed AFS book chapter on tagging techniques
Follow outline in chapter
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GoalGoal Provide background and frameworkProvide background and framework
• Light touch on broad topicsLight touch on broad topics• Later talks provide detailsLater talks provide details
• General recommendationsGeneral recommendations
OutlineOutline• Background on my perspectiveBackground on my perspective• Telemetry study assumptionsTelemetry study assumptions• General PrinciplesGeneral Principles
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BackgroundBackground Telemetry studies in Telemetry studies in
Columbia River BasinColumbia River Basin Largest known telemetry Largest known telemetry
studiesstudies• 40,000 juvenile salmon40,000 juvenile salmon
Measure fish survival at Measure fish survival at dams & reservoirsdams & reservoirs
Study Results:Study Results:• Legal implicationsLegal implications• ContentiousContentious• Critically reviewedCritically reviewed
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Telemetry Study AssumptionsTelemetry Study Assumptions Inherent assumptions: presence of the transmitter and the
procedure used to secure the transmitter have no effect on the tagged fish
Tagged fish represent untagged fish• Survival• Behavior (feeding, spawning)• Performance (swimming, buoyancy)
Unlikely that there will be “no effect” Diligent effort to minimize effects
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General PrinciplesGeneral Principles Recommended actions to minimize effects & Recommended actions to minimize effects &
support the assumptionsupport the assumption General Principles:General Principles:
1)1) Consider transmitter and attachment methodConsider transmitter and attachment method
2)2) Use best practices for fish handling & holdingUse best practices for fish handling & holding
3)3) Develop and enforce a SOPDevelop and enforce a SOP
4)4) Train taggers and manage tagger effectsTrain taggers and manage tagger effects
5)5) Manage anesthesiaManage anesthesia
6)6) Use aseptic techniqueUse aseptic technique
7)7) Evaluate transmitter effectsEvaluate transmitter effects
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It’s a matter of scale...or is it?It’s a matter of scale...or is it? My study is smaller scale, so I don’t My study is smaller scale, so I don’t
need all this stuff!need all this stuff!
A study with n=1 makes the same basic A study with n=1 makes the same basic assumptions assumptions
If you want to make inferences to the If you want to make inferences to the untagged population untagged population (and you know you do!) (and you know you do!) consider these principlesconsider these principles
Monitor Tagged fish
DescribeUntagged fish
INFERENCE
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1) Transmitter Selection1) Transmitter Selection
Define study requirementsDefine study requirements• Radio vs. acousticRadio vs. acoustic• Battery lifeBattery life• SensorsSensors• Will the smallest available tag work?Will the smallest available tag work?
Predict transmitter impact to fishPredict transmitter impact to fish• Tag burden (typically 1 to 5%)Tag burden (typically 1 to 5%)• Dimensions and volumeDimensions and volume• Consult literature for same species & sizeConsult literature for same species & size
• What’s been published? What is defensible?What’s been published? What is defensible?
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1) Attachment Method1) Attachment Method ExternalExternal Gastric / StomachGastric / Stomach
SurgicalSurgical
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1) Attachment Method
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1) Transmitter & Attachment1) Transmitter & Attachment
Relative to the assumption, ask yourself:Relative to the assumption, ask yourself:• Can I defend my choice of transmitter?Can I defend my choice of transmitter?• Have I considered the impact to the fish?Have I considered the impact to the fish?• Will a smaller tag meet my needs?Will a smaller tag meet my needs?• Have others used similar methods for Have others used similar methods for
this fish?this fish?
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2) Fish Handling & Holding2) Fish Handling & Holding
Best practices defined—just apply them!Best practices defined—just apply them! Often seen as trivial, Often seen as trivial, butbut…………
• Stressors can be cumulativeStressors can be cumulative• Can have large impacts on tagging outcomeCan have large impacts on tagging outcome
Critical to best outcome & defense of Critical to best outcome & defense of assumptionassumption
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2) Handling & Holding2) Handling & Holding Fish collection methodFish collection method Holding (before and/or after tagging)Holding (before and/or after tagging)
• Density and species interactionsDensity and species interactions
Transport considerationsTransport considerations• Density and temperatureDensity and temperature
Water quality conditionsWater quality conditions Fish transfersFish transfers
• Minimize them!!!Minimize them!!!• Transfer the container, not the fishTransfer the container, not the fish• Water to water transfersWater to water transfers
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2) Handling and Holding2) Handling and Holding
Tagging stationTagging station• Orients and holds fishOrients and holds fish• Enables anesthesiaEnables anesthesia• Aids aseptic techniqueAids aseptic technique• Comfortable for taggerComfortable for tagger
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3) Develop & Enforce a SOP3) Develop & Enforce a SOP Standard Operating Procedure (SOP)Standard Operating Procedure (SOP)
• Describe steps in the processDescribe steps in the process• Defines acceptable levels of parametersDefines acceptable levels of parameters• Consistent application of techniqueConsistent application of technique
Where do you start?Where do you start?• Modify from existing Modify from existing • Build your ownBuild your own
Test compliance (QA-QC monitoring)Test compliance (QA-QC monitoring)
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4) Taggers & Tagger Effects 4) Taggers & Tagger Effects
Practice, practice, practicePractice, practice, practice Training program:Training program:
• ““Best-match” fishBest-match” fish• Mentor (DVM?)Mentor (DVM?)• Assess proficiencyAssess proficiency• Feedback loopFeedback loop• Short-term holding Short-term holding
When to train:When to train:• New species or life stageNew species or life stage• After inactivityAfter inactivity
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4) Taggers & Tagger Effects4) Taggers & Tagger Effects
Study Design• Minimize number of
taggers• Balance tagger
contribution to study groups
• Consider a tank study to support field effort
Analysis• Be prepared to test
for tagger effects• Response variables
can be survival, average distance moved, etc.
• EXAMPLE
Tagger effects are REAL....anticipate them
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4) Tagger Effects Juvenile salmon
survival study Multiple taggers High sample sizes
Survival
Time
S = 92%
Survival
Time
A
B
S = 98%
S = 86%
A A A BB B
Tagger N S
A 50% 98%
B 50% 86%
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5) Manage Anesthesia
Critical part of tagging operation “Ideal anesthetic” *
• Short induction time & fast recovery • No persistent effects • Rapidly excreted = no withdrawal time• Safe for humans to handle
Know the legal status• Some information today during lunch
* Summerfelt and Smith in Methods for Fish Biology 1990
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5) Manage AnesthesiaMake your selectionRun some trials
• Match fish and water temperature• Vary concentration• Time induction and recovery
Finalize procedures and put into SOPBe rigorous with application
• Measure dosage• Refresh working solution• Log induction, recovery, exposure times
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6) Use Aseptic Technique More detail later today
Goal: minimize contamination by pathogens• Clean instruments, wear gloves, etc.
Cannot attain “sterile” conditions with fish Field conditions ≠ Surgical Suite Fish in water ≠ mammal on table
• Do the best you can!!
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6) Use Aseptic Technique6) Use Aseptic Technique
Why bother…who knows if it works? 1) Telemetry assumption
• Best possible care will minimize effects
2) Animal welfare concerns
3) Why not?• Err on the side of caution• If there is not a large “cost”
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7) Evaluate Transmitter Effects7) Evaluate Transmitter Effects
LiteratureLiterature• Match species, life Match species, life
stage & sizestage & size• Lab vs. field Lab vs. field
studies…get the studies…get the best matchbest match
MeasurementMeasurement• Commonly done in labCommonly done in lab
• Tagged vs. controlsTagged vs. controls• Try to incorporate field Try to incorporate field
elementelement• What response What response
variable?variable?
“Heart” of the assumption, so it has to be evaluated
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7) Evaluate Transmitter Effects7) Evaluate Transmitter Effects
SurvivalSurvival• Easy to measure in labEasy to measure in lab• Crude indicator Crude indicator
• Death is a late Death is a late indicator of stressindicator of stress
Physiological ResponsePhysiological Response• Sub-lethal effectsSub-lethal effects• Stress responseStress response• DiseaseDisease• HistologyHistology
Potential response variables…more to come later
suture
fibrosis
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7) Evaluate Transmitter Effects7) Evaluate Transmitter Effects
Swimming Swimming PerformancePerformance• Prolonged swimmingProlonged swimming• Burst swimmingBurst swimming
Buoyancy Buoyancy CompensationCompensation• Can fish compensate Can fish compensate
for extra mass?for extra mass?• How soon?How soon?
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7) Transmitter Effects7) Transmitter Effects
Predator Avoidance Predator Avoidance AbilityAbility• Tag may affect Tag may affect
mobilitymobility• Use a realistic Use a realistic
systemsystem
A little bit of A little bit of everythingeverything• Use a combination of Use a combination of
these performance these performance measuresmeasures
• Use field responses Use field responses with lab findingswith lab findings
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SummarySummary General Principles:General Principles:
1)1) Consider transmitter and attachment methodConsider transmitter and attachment method
2)2) Use best practices for fish handling & holdingUse best practices for fish handling & holding
3)3) Develop and enforce a SOPDevelop and enforce a SOP
4)4) Train taggers and manage tagger effectsTrain taggers and manage tagger effects
5)5) Manage anesthesiaManage anesthesia
6)6) Use aseptic techniqueUse aseptic technique
7)7) Evaluate transmitter effectsEvaluate transmitter effects
Check out the new book for more Check out the new book for more detailsdetails
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Acknowledgments & Confessions
Lots of folks involved
We’ve made ALL the big mistakes….
Always striving to improve
QUESTIONS?