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Colville Confederated Tribes

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Photos in true color at 1-foot resolution ... Biosonics DT-X Series Digital Scientific Echosounder and Visual Acquisition 5.0 Software ... – PowerPoint PPT presentation

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Title: Colville Confederated Tribes


1
Colville Confederated Tribes
  • Fish and Wildlife Department
  • Sheri Sears, Biologist, Resident Fish Manager
  • Monte Miller, Fisheries Biologist
  • Preliminary Review of Data Collected for the
  • Columbia River Water Management Plan (CRWMP)
  • Environmental Impact Statement (EIS)
  • For Impacts to Fisheries on the
  • Colville Reservation

2
  • The Washington Department of Ecology (Ecology)
  • and the
  • Bureau of Reclamation (BOR) are studying a
    proposed drawdown that would divert stored water
    from Lake Roosevelt for downstream agricultural,
    municipal, industrial, and domestic uses under
    the
  • Columbia River Water Management Plan (CRWMP)

3
The State of Washington's Department of Ecology
provided financial support for two projects
that the Colville Confederated Tribes Fish and
Wildlife proposed to assess the impacts to the
Tribes fisheries in Lake Roosevelt from the
actions proposed under the CRWMP

4
Studies Completed
  • Aerial photographs of the Lake from the Canadian
    Border to Grand Coulee Dam including the Spokane
    and Sanpoil Arms
  • Photos were converted to tiff and MrSid files for
    use with GIS
  • Projected in UTM Zone 11N, datum NAD83, meter
    units
  • A population assessment was conducted using
    hydro-acoustic technology to determine fish
    (biomass) utilization of targeted areas, of
    various substrates
  • Each area was then electro-fished or netted to
    determine species composition and the size of the
    fish

5
Third Study a Geophysical Survey of Lake
Roosevelt
  • Colville Tribes
  • Environmental Trust Departments Consultant
  • Environmental International Inc.
  • contracted
  • EHIS International Inc.
  • to conduct a Geophysical Survey
  • data was collected during July August 2007 by
  • Terra Remote Sensing Inc.
  • GIS files were created for
  • Bathymetry of Littoral Areas of
  • Lake Roosevelt

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Aerial Photos
  • Photos were taken from Grand Coulee Dam to
    Canadian Border by AeroMetrics
  • Sanpoil and Spokane Arms included
  • Photos in true color at 1-foot resolution
  • 160 GB file with 600 Tiff files and 3 large (1.5
    GB) zonal MrSid files
  • Photos were taken in the May of 2007 during the
    annual spring flood control drawdown (1248.5-feet
    elevation)

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Definiens
  • Photos were clipped to drawdown area
  • Running through a photo recognition program
    Definiens Professional 5.0
  • Developing GIS polygons of habitat types
  • Mud/silt Mixed Cobble
  • Sand Gravel
  • Bedrock
  • Calculate area of each habitat type impacted

25
Lake Roosevelt Side Looking Hydro-acoustics
  • Objective
  • To enumerate fish in littoral areas impacted by
    the proposed withdrawals of water from
  • Lake Roosevelt under the
  • CRWMP

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Equipment and Methods
  • Biosonics DT-X Series Digital Scientific
    Echosounder and Visual Acquisition 5.0 Software
  • Global Positioning Integrated
  • Dual Frequency Split Beam Multiplex system
  • Transducers 200kHz 6 degree and 420kHz 10 degree
  • Hardened Control Computer
  • Multiplex Cables

28
Equipment and Methods
  • Transducer attached to support bracket and
    lowered to a depth of about ½ meter.
  • The transducer is angled slightly down from
    horizontal to prevent surface echoes and noise.
  • The 6 degree conical field is 1 meter high at 10
    meters from the boat and 2 meters at 20 meters
    from the boat.

29
Settings
Temperature (affects speed of sound in water)
Threshold (Set at -70 dB)
-45dB will see a 10 cm fish -55 dB will see a 5
cm fish (but if fish is facing toward or away
the cross section it is less) -70dB is
recommended to reduce missed targets
Pulse Rate and Ping Duration (5
pings/second) Range (1.5-50m from boat)
GPS Position for Every Ping
30
Lake Roosevelt Hydro-Acoustic Studies
  • Hydro-acoustic Surveys Conducted August-October
    2007
  • Data Collected At 40 Transects
  • Electro-fishing Over Same Transects Immediately
    Followed
  • Areas Sampled Included Nine Previously Studied
    CCTFW Fisheries Evaluation Sites within
    Lacustrine, Transitional, and Riverine Areas
  • Included Embayment, Steep Bank, and Shoal
    Ecotypes of
  • Common Substrate Composition (Mud/Silt, Sand,
    Gravel, Cobble, Bedrock, etc.)
  • Additional Areas of Interest Were Included.

31
Lake Roosevelt Side Looking Hydro-acousticsSpring
er Bay (North of Kettle Falls)Surface
Elev.1287.50
Boat
30 Min.
Range
32
Lake Roosevelt Side Looking Hydro-acousticsSpring
er Bay (North of Kettle Falls)
Target Echoes Highlighted in Red
Boat
30 Min.
Range
Bottom Acquisition(Shoreline) On
33
First 1000 Pings
Lake Roosevelt Side Looking Hydro-acoustics
Boat
Range
Shoreline
34
Lake Roosevelt Side Looking Hydro-acoustics
Pings 51-100 Showing Approximately 149 Targets
98 Larger than 100mm Length 51 Less than 100mm
Length (Based on Strength of Echo)
Boat
Range
Shoreline
35
Electro-fishing Near Shore Area
  • Species Composition and Length Distribution
    Identified During Electro-fishing Will Be Used to
    Fill in Data from Hydro-acoustic Surveys.
  • Some Multi-Panel Experimental Gill Nets Were
    Deployed at the Ends of Transects for Comparison

36
Data Evaluation
  • Hydro-acoustic Data Currently Being Processed
    with Special Software
  • Electro-fishing and Gill Net Data Being Processed
  • Global Positioning Data for Each Hydro-acoustic
    Transect being Processed and Converted to GIS
    Files.
  • Verification of Substrate Type Indicated in
    Aerial Photos
  • Fish Habitat Use Estimation Based on Surveys to
    be Expanded to Other Areas of Geomorphic, Ecotype
    and Substrate Commonalities Within Lake Roosevelt.

37
Preliminary Indications
  • Young of the year (YOY) fish were seen in the
    near shore littoral zone that would be impacted
    by the proposed drawdown
  • The yellow perch (Perca flavescens) a non-native
    fish were found in large numbers in areas of
    aquatic or submerged terrestrial plants
  • Vegetation is minimal and will decrease under the
    proposed action
  • Smallmouth bass (Micropterus dolmiew) are located
    in areas of gravel or cobble

38
  • Burbot (Lota Lota) were seen in moderate and
    large cobble using the interstitial spaces as
    effective cover
  • The YOY walleye (Sander vitreus) are located in
    areas of sand substrate with
  • Larger walleye found in areas adjacent to
    vegetation or in deeper water just off the
    shallow shore waters
  • Most of the walleye sampled were between 220 to
    289 millimeters in length
  • Walleye over 250 millimeters in length were
    feeding heavily on yellow perch and black crappie
    (Pomoxis nigromaculatus).

39
Proposed Mitigation
  • The proposed drawdown will result in a five
    percent decrease in the area of aquatic habitat
    (this 5 loss may have a greater than 5 impact)
  • Loss of hiding cover
  • Increased predation
  • Block access to tributary spawning habitat
  • Pilot Research Project to provide hiding cover
    for small fish forced into deeper waters.
    Structures and artificial macrophytes will be
    installed and monitored for two years 2008-2009.
  • Pilot Research Project to construct floating
    spawning beds to reduce drawdown impacts to
    littoral spawning native forage species will be
    installed and monitored for two years 2008-2009
  • Cost share on the construction of a passage
    facility at Barnaby Creek to benefit native
    natural spawning kokanee

40
Contact Information
  • Sheri Sears, Resident Fish Manager
  • Colville Confederated Tribes
  • Fish and Wildlife Department
  • PO Box 150 Nespelem, WA 99155
  • Phone 509-634-2118
  • E-mail sheri.sears_at_colvilletribes.com
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