Escapement Enumeration Continuance of 2016 Pilot Project 2017 (2 nd - - PowerPoint PPT Presentation

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Escapement Enumeration Continuance of 2016 Pilot Project 2017 (2 nd - - PowerPoint PPT Presentation

Aug 23, 2022 307 likes •514 views

2017 Chilliwack River Chum Escapement Enumeration Continuance of 2016 Pilot Project 2017 (2 nd Year) GOAL: to enumerate total Fraser River Chum Salmon escapement by combining a high precision estimate of Chilliwack River Chum escapement

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SLIDE 1

2017 Chilliwack River Chum Escapement Enumeration

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SLIDE 2

Continuance of 2016 Pilot Project – 2017 (2nd Year)

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

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SLIDE 3

Introduction

  • BACKGROUND
  • STUDY AREA
  • ENVT’L CONDITIONS
  • APPLICATION
  • RECOVERY
  • PRELIM. POPULATION EST.
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SLIDE 4

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 R.

50 km

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SLIDE 5

Study Area

APPLICATION

  • In 2016, tags were applied in lower end with hopes to obtain

even mark distribution/mixing throughout watershed – RESULT: very few tags recovered in upper river

  • In 2017, the application crew distributed the tags with roving

application; marks applied throughout entire watershed. Chilliwack River Watershed

2016 Application Area Boundaries 2017 Application Area Boundaries

(+ some Upper R. tribs – not shown)

10 km

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SLIDE 6

Study Area

RECOVERY

  • Utilized same recovery areas as 2016 field season
  • Mainstem: Hatchery to KW Bridge
  • Lower Tribs: Sweltzer, Peach, Hopedale, Street, Giesbrecht
  • Upper Tribs: Centennial, Middle

Chilliwack River Watershed

  • And added many new recovery areas to 2017 field season
  • Lower Tribs: Salewin, Anderson, Borden, Wingfield
  • Upper Tribs: Anglewing, 15 Mile, 14 Mile, Centre, Foley

Recovery Area Boundaries + many other Upper R tribs (not shown) 10 km

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SLIDE 7
  • Rain / High Water

Environmental Issues

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SLIDE 8

Environmental Issues

1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5

Station 08MH001 Water Levels (m)

Historical Mean 1950-2016 Water Level 2016 Water Level 2017 2 periods of very high water levels Extended period of lower than avg. water levels

(during peak migration)

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SLIDE 9

APPLICATION

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SLIDE 10

APPLICATION

  • Sec. Mark - Double Peterson (new to 2017)

POH Length Data (cm) Other Metrics Recorded at Application:

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

Better application gear (nets new to 2017)

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SLIDE 11

APPLICATION

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SLIDE 12

APPLICATION

  • Tag Type:

Double Peterson Disc

  • Application Period: 12 Oct – 01 Dec (31 Application Days)
  • Total Tags Applied: 1826 (1120 Male; 701 Female; 5 Sex NR)
  • Untagged CM Rel.: 383 (187 Male; 196 Female)

20 40 60 80 100 120 140 160

Male Female

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SLIDE 13

RECOVERY

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SLIDE 14

4 1 2 1 1 1 1 107 2 2 5 15 1 50 33 25 19 1 38 34 8 84 3 5 14 1 7 1 4 9 27 1 1 3 8 1 1 2 1

20 40 60 80 100 120

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 16-Dec 18-Dec 20-Dec

Tagged Rec

RECOVERY

  • Recovery Period:

12 Oct – 21 Dec (complete overlap w/ App.)

  • Total Untagged Rec: 13,975 (7,215 Male; 6,748 Female; 12 Sex NK)
  • Total Tagged Rec:

524 (293 Male; 225 Female; 6 Sex NK)

  • TOTAL RECOVERIES: 14,499

9 3 37 1 10 4 27 6 9 16 15 133 1075 39 193 268 411 70 40 998 597 261 701 206 652 599 285 1019 903 18 186 500 428 536 180 313 563 1229 165 98 138 249 307 326 110 39 3

200 400 600 800 1000 1200 1400

Total Untagged Rec

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SLIDE 15

RECOVERY

Higher tag incidence in lower watershed in 2017 as high number of tags applied here during low water Increased tag incidenc in upper watershed in 2017 – due to new roving application strategy

0.0% 1.0% 2.0% 3.0% 4.0% 5.0% 6.0% 7.0% 8.0% 9.0% 10.0% 500 1000 1500 2000 2500 TOTAL REC TAG INCIDENCE AVG TAG INCIDENCE

MAINSTEM SECTIONS TRIBUTARIES

DOWNSTREAM UPSTREAM

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SLIDE 16

RECOVERY

BIOSAMPLING

  • Total Bio Sampled:

712 (388 Male; 316 Female; 6 sex NK)

  • Total Scale Samples:

658 (357 Male; 298 Female; 3 sex NK)

  • Average Length:

58.8cm (Male 60.0cm; Female 58.3cm)

0% 2% 4% 6% 8% 10% 12% 14% 16%

42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74

Proportion of Total Sampled Length (POHL-cm)

Proportionate Length Comparison Male Female

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SLIDE 17

RECOVERY

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SLIDE 18
  • Prelim. Population Estimate

N = MC R

M (total marks applied) = 1,826 C (total carcasses rec) = 14,499 R (total marks rec) = 524 N = (1,826 x 14,499) 524 N = 26,475,174 524

50,525

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SLIDE 19

2017 CREW