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Monitoring Selective Fisheries Presentation

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Title: Monitoring Selective Fisheries Presentation


1
Development and Implementation of a Monitoring
Program for Mark-selective Chinook Salmon
Fisheries in Puget Sound, Washington
  • Mark Baltzell
  • Pete McHugh
  • Laurie Peterson
  • Steve Thiesfeld

April 1, 2009
Washington Department of Fish and Wildlife
2
Topics
  • Introduction/Background mark-selective
    fisheries
  • Overview of WDFW Puget Sound Sampling Units
    comprehensive monitoring program for Chinook
    mark-selective fisheries.
  • Methods
  • Results
  • Conclusions
  • Questions

3
Production of Marked Chinook
  • Adipose fin-clip external mark indicating
    hatchery origin fish.
  • Marking program consistent with hatchery reform
    practices.

4
Mark-Selective Fisheries
5
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

6
Chinook Mark-Selective Fishery Objectives
No increase in wild stock impacts
Increase Angler Opportunity
Increase Hatchery Fish Harvest
Sample, Monitor, Enforce All Fisheries
Reduce wild stock impacts if possible
7
Evaluating Selective Chinook Fisheries 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.


8
Critical Data Parameters
  • 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.

9
WDFW Puget Sound Sampling Unit Selective Fishery
Monitoring Program
10
WDFW Puget Sound Sampling Unit Selective Fishery
Monitoring Program
On-the-water Surveys
Size Measures Select Sites
Dockside Sampling
Out-of-frame effort proportion
Test Fishing
11
Fishing methods
WDFW Puget Sound Sampling Unit Selective Fishery
Monitoring Program
Length, age
CWTs
On-the-water Surveys
Size Measures Select Sites
Dockside Sampling
Out-of-frame effort proportion
Test Fishing
12
Dockside Sampling
  • Recover CWTs from salmon that detect positive
    for a tag.
  • At least 20 sample rate is the goal.
  • Length measurements and scale samples.
  • Fishing method data.

13
Fishing methods
WDFW Puget Sound Sampling Unit Selective Fishery
Monitoring Program
Length, age
CWTs
On-the-water Surveys
Size Measures Select Sites
Dockside Sampling
Out-of-frame effort proportion
Test Fishing
Length, age (all)
Chinook Size/mark-status comp.
VTRs
DNA sampling
14
Test Fishing
  • 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).

15
Fishing methods
WDFW Puget Sound Sampling Unit Selective Fishery
Monitoring Program
Length, age
CWTs
On-the-water Surveys
Size Measures Select Sites
Dockside Sampling
Out-of-frame effort proportion
Test Fishing
Total salmon encounters
Length, age (all)
Chinook Size/mark-status comp.
DNA sampling
Total Fishery Impacts
16
Dockside Sampling
On-the-water Surveys
Test Fishing
Total Chinook Encounter Estimates (Retained
Released)
Apportion Total Encounters into 4 Size/Mark
groups
  • Apply size-specific release mortality rates
  • 15 Legal
  • 20 Sublegal

Compare to Model (FRAM) predictions
Total Estimated Fishery Impacts
17
Voluntary Trip Reports
  • Encounters by species.
  • Chinook mark rates and encounter rates by
    size/mark status.

18
Estimated Unmarked Chinook Mortalities (Summer
Fisheries) Providing Opportunity and Meeting
Conservation Goals
19
Unmarked Mortality Estimates vs. Modeled (FRAM)
Predictions
Unmarked Chinook impacts similar to or less than
model predictions.
20
Legal-size Marked Chinook Estimates vs. Modeled
(FRAM) Predictions
Legal-sized, marked Chinook harvest consistent
with model predictions.
21
Test Fishery Results Emulating the Fleet
Mark Rates
Total Lengths
22
CWT Recoveries For All Chinook Mark-Selective
Fisheries in Puget Sound 2005-08
N 1184
23
CWT Recoveries for Chinook Mark Selective
Fisheries in the Strait of Juan de Fuca 2003-08
24
Adequacy of Sampling Program Sample Size Goals
  • High percentage landed catch and angler trips
    sampled overall, exceeding the 20 sample rate
    target
  • 38 (winter fisheries)
  • 31 (summer fisheries)

25
Adequacy of Sampling Program Precision of
Estimates Coefficient of Variation (CV)
  • Opportunities to make sampling more efficient
    cost-effective?

26
Conclusions
  • 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.

27
Sampling Program Conclusions
  • 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.

28
If you would like to know more…..the place to
find all of our documentation on Chinook MSFs
  • http//wdfw.wa.gov/fish/ selective/techniques/
    technical_documents.htm
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