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Development and Implementation of a Development and Implementation of a Monitoring Program for Mark-selective Chinook Monitoring Program for Mark-selective Chinook Salmon Fisheries in Puget Sound, WashingtonSalmon Fisheries in Puget Sound, Washington
Washington Department of Fish and Wildlife
Mark BaltzellMark BaltzellPete McHughPete McHugh
Laurie Peterson Laurie Peterson Steve ThiesfeldSteve Thiesfeld
April 1, 2009
TopicsTopics Introduction/Background:
mark-selective fisheries Overview of WDFW Puget Sound
Sampling Unit’s comprehensive monitoring program for Chinook mark-selective fisheries.MethodsResultsConclusions
Questions
Adipose fin-clip; external mark indicating hatchery origin fish.
Marking program consistent with hatchery reform practices.
Production of Marked Chinook
Mark-SelectiveMark-Selective FisheriesFisheries
Marine Areas with Chinook MSFs
Summer Seasons
Winter Seasons
• Higher effort
• Some are quota-managed
• Directed at maturing migrants
• Fewer fish handled per kept
• Multiple species encountered
• Lower effort (weather driven)
• Directed at resident “blackmouth”
• More fish handled per kept (size)
• Mostly single species encounters
Chinook Mark-Selective Fishery Objectives
No increase in wild stock
impacts
Reduce wild stock impacts
if possible
Increase Angler
Opportunity
Increase Hatchery
Fish Harvest
Sample, Monitor, Enforce
All Fisheries
Evaluating Selective Chinook Fisheries Evaluating Selective Chinook Fisheries Key Objectives:Key Objectives:
Determine if the data needed to estimate critical selective fishery parameters can be collected.
Evaluate if sample sizes needed to produce estimates with agreed levels of precision can be realistically obtained.
Enable evaluation and planning of potential future mark-selective fisheries.
Mark rate in the fishery - from estimates of marked and unmarked encounters.
Number marked and unmarked fish retained. Number marked and unmarked fish released. Number of the Chinook encounters that are of sub-legal size
(less than 22 inches total length). Stock composition of the mortalities– estimated by CWT and
DNA. KEY CHALLENGE: Indirect estimation of impacts
on unmarked fish that are caught and released.
Critical Data Critical Data ParametersParameters
WDFW Puget Sound Sampling Unit Selective Fishery Monitoring Program
DocksideSampling
On-the-waterSurveys
TestFishing
WDFW Puget Sound Sampling Unit Selective Fishery Monitoring Program
Size Measures;
Select Sites
Out-of-frame effort proportion
DocksideSampling
On-the-waterSurveys
TestFishing
WDFW Puget Sound Sampling Unit Selective Fishery Monitoring Program
Length,age CWTs
Fishingmethods
Size Measures;
Select Sites
Out-of-frame effort proportion
DocksideSampling
Recover CWT’s from salmon that detect positive for a tag.
At least 20% sample rate is the goal.
Length measurements and scale samples.
Fishing method data.
DocksideSampling
On-the-waterSurveys
TestFishing
Chinook Size/mark-
status comp.
Length,age CWTs
DNAsampling
Length,age (all)
WDFW Puget Sound Sampling Unit Selective Fishery Monitoring Program
Fishingmethods
VTRs
Size Measures;
Select Sites
Out-of-frame effort proportion
TestFishing
Encounters by species. Chinook mark rates and
encounter rates by size/mark status.
DNA samples on all Chinook.
Scale and length samples on all Chinook.
Emulate the recreational fleet (gear types, locations fished).
DocksideSampling
On-the-waterSurveys
TestFishing
Total salmon
encounters
Chinook Size/mark-
status comp.
Total FisheryImpacts
Length,age CWTs
DNAsampling
Length,age (all)
WDFW Puget Sound Sampling Unit Selective Fishery Monitoring Program
Fishingmethods
Size Measures;
Select Sites
Out-of-frame effort proportion
DocksideSampling
On-the-waterSurveys
TestFishing
Total Chinook Encounter Estimates(Retained + Released)
Total Estimated Total Estimated FisheryFisheryImpactsImpacts
Legal-size marked (LM) Legal-size unmarked (LU) Sublegal-size marked (SM) Sublegal-size unmarked (SU)
Chinook Size/Mark-Status
Apply size-specific release mortality rates
•15% Legal •20% Sublegal
Apportion Total Encounters into
4 Size/Mark groups
Compare toModel (FRAM)
predictions
Voluntary Trip ReportsVoluntary Trip Reports
Encounters by species.
Chinook mark rates and encounter rates by size/mark status.
Marine Area
Year(s)
Est. Number Angler Trips
Est. Number Marked Chinook
Harvested
Est. Number Chinook Released
Est. Number
Unmarked Mortalities
Area 5 2003-08 129,698 16,602 50,864 5,935
Area 6 2003-07 19,715 3,126 5,017 988
Area 9 2007-08 38,558 8,984 19,515 1,513
Area 10 2007-08 22,183 2,542 8,101 501
Area 11 2007-08 144,686 18,041 34,267 1,875
Total 354,840 49,295 117,764 10,812
Estimated Unmarked Chinook Mortalities Estimated Unmarked Chinook Mortalities (Summer Fisheries)(Summer Fisheries)
Providing Opportunity and Meeting Conservation GoalsProviding Opportunity and Meeting Conservation Goals
Unmarked Chinook impacts: similar to or
less than model predictions.
Unmarked Mortality Estimates vs. Unmarked Mortality Estimates vs. Modeled (FRAM) PredictionsModeled (FRAM) Predictions
Legal-sized, marked Chinook harvest:
consistent with model predictions.
Legal-size Marked Chinook Estimates vs. Legal-size Marked Chinook Estimates vs. Modeled (FRAM) PredictionsModeled (FRAM) Predictions
Test Fishery ResultsTest Fishery ResultsEmulating the FleetEmulating the Fleet
Mark Rates Total Lengths
CWT Recoveries For All Chinook Mark-Selective CWT Recoveries For All Chinook Mark-Selective Fisheries in Puget Sound 2005-08Fisheries in Puget Sound 2005-08
N = 1184
CWT Recoveries for Chinook Mark Selective CWT Recoveries for Chinook Mark Selective Fisheries in the Strait of Juan de Fuca 2003-08Fisheries in the Strait of Juan de Fuca 2003-08
High percentage landed catch and angler trips sampled overall, exceeding the 20% sample rate target:
38% (winter fisheries)
31% (summer fisheries)
Adequacy of Sampling ProgramAdequacy of Sampling ProgramSample Size GoalsSample Size Goals
Estimated Parameter
(Chinook)
Summer MSF
Fisheries CV
Winter MSF
Fisheries CV
Total Landed Catch 11% 9%
Unmarked Releases 12% 10%
Test Fishery Mark Rates 9% 3%
Adequacy of Sampling ProgramAdequacy of Sampling ProgramPrecision of EstimatesPrecision of EstimatesCoefficient of Variation (Coefficient of Variation (CVCV))
Opportunities to make sampling more efficient & cost-effective?
ConclusionsConclusions
Pilot selective Chinook fisheries enabled recreational fishing opportunities while meeting the conservation constraints defined for Puget Sound Chinook.
Sampling programs collected critical information necessary for evaluating and planning future pilot selective Chinook fisheries.
Measured impacts of the fishery were either less than or comparable to pre-season expectations (FRAM model) for unmarked Chinook salmon.
Enabled implementation and assessment of our comprehensive selective fishery monitoring program in Puget Sound marine areas.
Sampling ProgramSampling ProgramConclusionsConclusions
Dockside sampling and test fishery efforts succeeded in:Achieving agreed-to sampling objectives.Yielding precise estimates of key fishery
parameters. Test fishery emulated the fleet
Continue feedback loop to test boats --spatial data collection and dockside fishing method question.
If you would like to know more…..the place to find all of our documentation on Chinook MSF’s
http://wdfw.wa.gov/fish/ selective/techniques/ technical_documents.htm