assessment of a-run steelhead population in the clearwater nez perce tribe department of fisheries...
TRANSCRIPT
![Page 1: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/1.jpg)
Assessment of A-run Steelhead population in the Clearwater
Nez Perce Tribe
Department of Fisheries Resources Management
![Page 2: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/2.jpg)
Snake River Steelhead ESU
• Listed as threatened
• Number of sub-populations– Snake River Subbasin– Clearwater River Subbasin
![Page 3: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/3.jpg)
Clearwater Subbasin Steelhead
• Two populations (A-run and B-run)– Size, return-timing– Location of spawning
![Page 4: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/4.jpg)
Adult Escapement to LGD
0
5
10
15
20
25
Year
A-r
un e
scap
emen
t (x1
0,00
0)
NMFS 2000
![Page 5: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/5.jpg)
Estimated juvenile carrying capacity
0102030405060708090
100
85 87 89 91 93 95 97
Year
Per
cent
of C
arry
ing
Cap
acit
y
(NMFS 2000)
![Page 6: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/6.jpg)
Declines A-run Steelheadin Clearwater
• Construction and Operation of Hydropower
• Environmental Factor– Natural variation– Man Induced (303d listings)
• Current Hatchery Practices ??– Loss of genetic diversity and spatial structure
![Page 7: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/7.jpg)
(Milner and Teel 1985)
![Page 8: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/8.jpg)
A-run Clearwater Steelhead Unknowns
• Current Status– Abundance– Productivity– Spatial Structure– Diversity
![Page 9: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/9.jpg)
2000 BiopESU Populations
• … to be identified and defined using biological criteria and for the evaluation of ESU population status (viability) in accordance with NMFS’ viable salmon population approach (McElhany et al. 2000)
• … the need to assess population status to establish recovery goals and gauge change towards the goals (Action 179)
![Page 10: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/10.jpg)
Proposed Study ObjectivesA-run Clearwater Steelhead Population
1. Abundance and productivity
2. Spatial structure and genetic diversity
3. Environmental effects
4. Communication results
![Page 11: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/11.jpg)
1. Abundance and production
1. Spawner escapement • Adult Weir
2. Smolt yield /survival• Screw Trap
3. Juvenile densities • Snorkeling
![Page 12: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/12.jpg)
1. Spawner escapement -- Adult Weir 2. Smolt yield / survival -- Screw trap3.Juvenile production/ densities -- Snorkeling
![Page 13: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/13.jpg)
2. Spatial structure and genetic diversity
• Task 1. Genetic survey of population
- 30 populations (primarily lower basin)
- 10 genetic microsatellite markers
- Previous work mid-80’s, 90’s and 00’s
- Detect changes- Results used to develop plan to assess
cause
![Page 14: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/14.jpg)
Task 2. Straying rates
• Radio tag A-run steelhead adults at LGD – PIT tagged juveniles and non marked fish
• Track to spawning grounds• Results
– Escapement to Clearwater and Snake Subbasins– Escapement to Big Canyon Creek– Prespawning mortality– Understanding of straying
![Page 15: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/15.jpg)
3. Environmental Influence
• Big Canyon Creek (Tier 2)– Temperature– Instream Flow– Habitat
• Potlatch, Lapwai, Jacks, Bedrock, Cottonwood Creeks (Tier 1)– Temperature– Instream Flow
![Page 16: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/16.jpg)
4. Communicate results
• Assessing and tracking recovery efforts– RPAs (NMFS 2000)– Regional Management and Harvest Actions
(Subbasin Summary 2001)
• Fully assess and understand the status or viability of the Snake River Steelhead ESU
![Page 17: Assessment of A-run Steelhead population in the Clearwater Nez Perce Tribe Department of Fisheries Resources Management](https://reader035.vdocuments.us/reader035/viewer/2022062618/5514e9c6550346b0478b5b8a/html5/thumbnails/17.jpg)