Kwikwetlem Sockeye Restoration Project (KSRP) A Summary of who we - - PowerPoint PPT Presentation

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Kwikwetlem Sockeye Restoration Project (KSRP) A Summary of who we - - PowerPoint PPT Presentation

Mar 31, 2023 472 likes •701 views

Kwikwetlem Sockeye Restoration Project (KSRP) A Summary of who we are and the work done to date KSRP Outline 1. Introduction 2. Location 3. Low Level Outlet (LLO) Gatehouse smolt output 4. Sockeye Adult Trap adult

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SLIDE 1

Kwikwetlem Sockeye Restoration Project (KSRP)

A Summary of who we are and the work done to date

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SLIDE 2

KSRP – Outline

1. Introduction 2. Location 3. Low Level Outlet (LLO) Gatehouse

  • smolt output

4. Sockeye Adult Trap

  • adult returns

5. Challenge 6. Studies

  • work done to date
  • Water quality panel
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SLIDE 3

KSRP – Introduction

Who:

  • A group stakeholders who have an interest in the Coquitlam

watershed that are working with Kwikwetlem FN to restore an extirpated run of sockeye salmon.

Problem:

  • Construction of Coquitlam dam blocked migratory route of historical

sockeye run in 1914.

  • Landlocked juveniles forced into a freshwater-only life history (i.e., as

kokanee)

  • 25 generations of reservoir existence may have altered the stock’s

morphology and behavior

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KSRP – Introduction

Objective

  • Restore the extirpated run of sockeye salmon

1. Short term:

1. Establish a sustainable run of sockeye salmon 2. Learn about Kwikwetlem sockeye ecology

2. Long term:

1. Restore the sockeye run given prevailing conditions (i.e., revert landlocked sockeye back to primarily a sea run population)

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KSRP – Location

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KSRP – Location

(3d view)

Red line marks elevation of historical lake Coquitlam Dam and forebay

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SLIDE 7

KSRP – Location

(Air photo view)

Coquitlam Dam and Forebay

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SLIDE 8

KSRP – Location

(Dam and Forebay)

LLO Gatehouse

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KSRP – LLO Gatehouse

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KSRP – LLO Gatehouse

Typical range of reservoir elevations during smolt

  • ut migration

Movement of smolts

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KSRP – LLO Gatehouse

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SLIDE 12

KSRP – LLO Gatehouse

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KSRP – smolt output

200 400 600 800 1000 1200 1400 1600 2005 2006 2007 2008 2009 2010

Estimated Smolt Output

< 50

First year of monitoring

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KSRP – smolt output Possible reasons for dwindling counts:

1. Structure itself (small opening at depth) 2. Flow too low to attract smolts 3. Reservoir levels too high – LLO too deep 4. Reservoir levels too low – forebay too shallow 5. Diversion tunnel - intercepts smolts 6. Predation 7. Too few smolts in reservoir – no incentive to leave 8. Drive to emigrate lost - natural selection favors ‘stayers’ 9. ???

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KSRP – Sockeye Adult Trap

Adult trap box

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KSRP – Sockeye Adult Trap

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KSRP – Sockeye Adult Trap

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KSRP – Sockeye Adult Trap

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SLIDE 19

KSRP – Sockeye Adult Returns

2 4 6 8 10 12 2005 2006 2007 2008 2009 2010

Adult Returns

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No adults expected for 1st 2 years 1st year of Adult trap operation

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KSRP – Sockeye Adult Returns

  • Possible reasons for low adult counts
  • Low smolt output (Smolt to adult survival is usually

about 1 in 100)

  • Trap functional only since 2008
  • Error in smolt estimates (unlikely)
  • From similar work in Alouette Lake Reservoir
  • Adults survive transport
  • Appear to successfully spawn
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KSRP – Challenge

Short term KSRP objective:

1. Establish a sustainable population

  • Target numbers not yet established
  • Using Sakinaw Lake sockeye as example:

– DFO target minimum: 250 adults – Assuming 1% survival: 25,000 smolts

2. Learn Kwikwetlem sockeye ecology

  • Study work underway since 2004
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SLIDE 22

KSRP – Study work