GSI Ratio Method for Determining Total Fraser Chum Escapement or - - PowerPoint PPT Presentation

▶
gsi ratio method for determining total fraser
SMART_READER_LITE
LIVE PREVIEW

GSI Ratio Method for Determining Total Fraser Chum Escapement or - - PowerPoint PPT Presentation

Feb 22, 2024 263 likes •570 views

GSI Ratio Method for Determining Total Fraser Chum Escapement or Albion-based estimate of total Fraser River Chum Salmon escapement using GSI at Albion and enumeration of Chilliwack River Chum Salmon escapement, Background Fraser River

slide-1
SLIDE 1

GSI Ratio Method for Determining Total Fraser Chum Escapement

Albion-based estimate of total Fraser River Chum Salmon escapement using GSI at Albion and enumeration of Chilliwack River Chum Salmon escapement,

  • r
slide-2
SLIDE 2

Background

  • Fraser River Chum are a significant driver for

mixed stock Chum fisheries occurring in Johnstone Strait (Canadian Areas 12 & 13) and US Areas 7 & 7A

  • Fraser River Chum are managed as a single

stock

  • Total Chum Salmon escapement to the Fraser

River is not enumerated

  • Only a portion (approx. 30%) of the ~110 Chum

spawning sites are annually surveyed

  • Looking for new tools to estimate total Fraser

escapement

slide-3
SLIDE 3
  • Significant Fraser River contributors, such as

Harrison and Stave rivers, are surveyed annually

  • Other significant contributors have not been

enumerated for many years

  • Chilliwack Chum were assessed and found to

be genetically different from the Fraser aggregate

  • Chilliwack spawners were last assessed in 2001
  • On average (years 1953-2001), Chilliwack Chum

comprised ~20% of the assessed Chum escapement to the Fraser River (range: 2% - 42%)

Background

slide-4
SLIDE 4
  • To enumerate total Fraser River Chum Salmon

escapement by:

  • combining a high precision estimate of

Chilliwack River Chum salmon escapement with

  • the ratio of Chilliwack Chum to the total Fraser

Chum captured in the Albion Test Fishery

  • The proportion of Chilliwack Chum at Albion will

be determined using GSI on tissue from scale samples

  • Scale samples already collected during the

conduct of the test fishery

Background

slide-5
SLIDE 5
  • Accurate escapement estimates are important

to all aspects of Fraser River Chum salmon management including:

  • Annual stock run reconstruction (a PSC Bi-lateral

Chum Technical Committee initiative supported by the PSC Southern Panel)

  • Production outlook
  • In-season terminal abundance estimates (Albion

Chum Model)

  • Evaluating whether management objectives

were met

Background

slide-6
SLIDE 6
  • These assessments will assist the PSC Southern

Panel, the Chum Technical Committee and the DFO in pre- and post-season management processes

  • This methodology has been used successfully to

estimate Chinook escapement to the Skeena River in northern BC (CTC 2015)

Background

slide-7
SLIDE 7

The Math

Chilliwack Catch at Albion Chilliwack Escapement Total Catch at Albion Total Fraser Escapement =

slide-8
SLIDE 8

The Math

Chilliwack Escapement X Total Catch at Albion = Chilliwack Catch at Albion Total Fraser Escapement

slide-9
SLIDE 9

2016 Chilliwack River Chum Escapement Enumeration

slide-10
SLIDE 10

Introduction

  • Background
  • Study Area
  • Environmental Issues
  • Application
  • Recovery
slide-11
SLIDE 11

Background

GOAL: to enumerate total Fraser River Chum Salmon escapement by combining a high precision estimate of Chilliwack River Chum escapement with the ratio of Chilliwack Chum to the total Fraser Chum captured in the Albion Test Fishery

slide-12
SLIDE 12

Study Area

  • This study took

place within the Chilliwack River watershed (highlighted below)

Stave River Pitt River Chilliwack Lake

  • Data to be

linked to Albion Test Fishery data (highlighted below)

ALBION CHILLIWACK RIVER

slide-13
SLIDE 13

Study Area

APPLICATION

  • Low in system (Top
  • f Canal – Vedder

Bridge)

  • Tags applied in

lower end to ensure even distribution/mixing throughout watershed

Top of canal Denim Pool KW Bridge Hoogies Lickman Giesbrecht Teskies

Chilliwack River Watershed

MAIN APPLICATION SITES

Vedder Bridge Chilliwack Hatchery

slide-14
SLIDE 14

Peach Creek Hopedale Slough Street Creek Sweltzer Creek Vedder Bridge KW Bridge

RECOVERY

Mainstem and side channels

(Keith Wilson Bridge to Hatchery) Lower Chilliwack River Tributaries

Study Area

Lower River tribs

  • Sweltzer Creek
  • Peach Creek
  • Hopedale Sl.
  • Street Creek

Upper River tribs

  • Ryder Creek
  • Centennial Ch.
  • Middle Creek
slide-15
SLIDE 15

Environmental Issues

  • RAIN!!!

1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60 2.80 3.00 03-Oct 05-Oct 07-Oct 09-Oct 11-Oct 13-Oct 15-Oct 17-Oct 19-Oct 21-Oct 23-Oct 25-Oct 27-Oct 29-Oct 31-Oct 02-Nov 04-Nov 06-Nov 08-Nov 10-Nov 12-Nov 14-Nov 16-Nov 18-Nov 20-Nov 22-Nov 24-Nov 26-Nov 28-Nov 30-Nov 02-Dec 04-Dec 06-Dec 08-Dec 10-Dec 12-Dec 14-Dec

2016 Chilliwack River Water Levels (m)

  • taken at Vedder Bridge Crossing 08MH001

~ 1.0m to 1.4m ideal for mainstem application

  • Gravel bars and islands clear and visible
  • flow ideal
slide-16
SLIDE 16

Environmental Issues

  • RAIN!!!

1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60 2.80 3.00 03-Oct 05-Oct 07-Oct 09-Oct 11-Oct 13-Oct 15-Oct 17-Oct 19-Oct 21-Oct 23-Oct 25-Oct 27-Oct 29-Oct 31-Oct 02-Nov 04-Nov 06-Nov 08-Nov 10-Nov 12-Nov 14-Nov 16-Nov 18-Nov 20-Nov 22-Nov 24-Nov 26-Nov 28-Nov 30-Nov 02-Dec 04-Dec 06-Dec 08-Dec 10-Dec 12-Dec 14-Dec

2016 Chilliwack River Water Levels (m)

  • taken at Vedder Bridge Crossing 08MH001

~ 1.4m to 2.0m mainstem application becomes difficult

  • Gravel bars/islands start to disappear
  • flow affects net weight
slide-17
SLIDE 17

Environmental Issues

  • RAIN!!!

1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60 2.80 3.00 03-Oct 05-Oct 07-Oct 09-Oct 11-Oct 13-Oct 15-Oct 17-Oct 19-Oct 21-Oct 23-Oct 25-Oct 27-Oct 29-Oct 31-Oct 02-Nov 04-Nov 06-Nov 08-Nov 10-Nov 12-Nov 14-Nov 16-Nov 18-Nov 20-Nov 22-Nov 24-Nov 26-Nov 28-Nov 30-Nov 02-Dec 04-Dec 06-Dec 08-Dec 10-Dec 12-Dec 14-Dec

2016 Chilliwack River Water Levels (m)

  • taken at Vedder Bridge Crossing 08MH001

~ >2.0m mainstem application very difficult

  • Gravel bars/islands under water; flow too strong for net
  • BENEFIT – creation of side channel seam lines!!!
slide-18
SLIDE 18

SNOW & ICE…

  • Elongated cold front

hampered carcass recovery (last 3 weeks)

  • Chum frozen solid

(and to the ground itself)

  • Unable to collect

certain biosamples

Environmental Issues

slide-19
SLIDE 19

Application

slide-20
SLIDE 20

APPLICATION

Secondary Mark (1L/2L) & DNA Sex & Fork Length Data (cm) Other Metrics Recorded at Application:

  • Tag Site Location
  • Daily Set #
  • Maturity Code (A, B, C)
  • Marks (SP, N, F, W)
  • Stress Rel Code (1, 2, 3, 4)
slide-21
SLIDE 21

APPLICATION

slide-22
SLIDE 22

APPLICATION

  • Tag Type:

Peterson Disc

  • Application Period: 03 Oct – 29 Nov
  • Total Tags Applied: 1867 (1078 Male; 798 Female)
  • Untagged CM Rel.: 481 (204 Male; 277 Female)
  • No defined peak – CM arrival in pulses coinciding with high

water events

20 40 60 80 100 120 03-Oct 05-Oct 07-Oct 09-Oct 11-Oct 13-Oct 15-Oct 17-Oct 19-Oct 21-Oct 23-Oct 25-Oct 27-Oct 29-Oct 31-Oct 02-Nov 04-Nov 06-Nov 08-Nov 10-Nov 12-Nov 14-Nov 16-Nov 18-Nov 20-Nov 22-Nov 24-Nov 26-Nov 28-Nov 30-Nov

Tags Applied by Date - Male vs. Female

Female Male

slide-23
SLIDE 23

RECOVERY

slide-24
SLIDE 24

RECOVERY

  • Recovery Period:

13 Oct – 19 Dec (47 day overlap w/ Application)

  • Total Untagged Rec: 44,487 (20,510 Male; 23,977 Female)
  • Total Tagged Rec:

564 (286 Male; 266 Female; 12 Sex NK)

  • TOTAL RECOVERIES:

45,051

1 6 2 2 43 51 9 5 23 26 3 1 4 12 9 5 7 44 38 21 9 2 40 32 8 9 58 50 8 1 3 11 11 2 6 1 1

10 20 30 40 50 60 TAGGED RECOVERIES

2 5 4 6 7 11 7 30 224 862 34 78 958 605 473 296 93 561 1802 865 1166 914 1122 3851 2110 2330 1189 534 1505 2385 3308 951 2775 1263 2905 1379 1053 620 1873 986 1134 475 1209 200 143 75 109

500 1000 1500 2000 2500 3000 3500 4000 4500

13-Oct 15-Oct 17-Oct 19-Oct 21-Oct 23-Oct 25-Oct 27-Oct 29-Oct 31-Oct 02-Nov 04-Nov 06-Nov 08-Nov 10-Nov 12-Nov 14-Nov 16-Nov 18-Nov 20-Nov 22-Nov 24-Nov 26-Nov 28-Nov 30-Nov 02-Dec 04-Dec 06-Dec 08-Dec 10-Dec 12-Dec 14-Dec 16-Dec 18-Dec

UNTAGGED RECOVERIES

slide-25
SLIDE 25

RECOVERY

Higher proportions of tagged recoveries @ main application sites Lower proportions of tagged recoveries in upper segments

0.00% 1.00% 2.00% 3.00% 4.00% 5.00% 2000 4000 6000 8000 10000 12000

R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15

# RECOVERED TAG INCIDENCE

CHUM CARCASSES

slide-26
SLIDE 26

RECOVERY

BIOSAMPLING

  • Total Chum Bio Sampled:

914 (452 Male; 450 Female; 12 sex NK)

  • Total Scale Samples:

779 (385 Male; 394 Female)

  • Average Length:

56.8cm (Male 57.8cm; Female 55.5cm)

0% 2% 4% 6% 8% 10% 12% 14% 16% 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70+

Proportion of Total Sampled

Size (cm)

Proportionate Length Comparison

% MALE % FEMALE

slide-27
SLIDE 27

RECOVERY

slide-28
SLIDE 28
  • Prelim. Population Estimate

N = M x C R

M (total marks applied) = 1,867 R (total marks rec) = 564 C (total carcasses rec) = 44,487

N = (1,867 x 44,487) 564 N = 83,057,229 564

147,265

slide-29
SLIDE 29

2016 CREW

slide-30
SLIDE 30

Work to Do

  • Complete analysis/adjustments of the mark-

recapture data

  • Finalize escapement estimation

(by sex and age)

  • Process GSI tissue from Albion scale samples
  • Use GSI results to estimate total Fraser River

Chum escapement

  • Evaluate all project elements
  • Provide report to PSC SF

Note: Proponents have applied to the PSC Southern Fund to repeat project in 2017/18