Draft Imnaha Subbasin Summary November 30, 2001 Prepared for the Northwest Power Planning Council Subbasin Team Leader



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Adult returns

In 1996, 34 adults were released into Marr Pond and 33 adults were released into Wallowa Wildlife Refuge. Likewise, in 1997, two wild adults were returned to the Imnaha River and in 1999. From 1990 to 1999, all wild adults in excess to broodstock needs were released back into Little Sheep Creek, above the acclimation pond.


9.2) Life history stage, size, and age of natural fish of same species
9.3) Dates of release and release protocol

Most wild smolts migrate from April through June with peak migration in May. Hatchery smolts are programmed to track these trends, and are thus released predominately in mid-to-late April. Since broodyear 1996, steelhead have been released in mid-May, in addition to April releases to maximize acclimation. In 1998, grade-outs (5,015) were released in early November, and in 1999, two groups of juveniles were released into Big Sheep Creek (90,000) and Little Sheep Creek (59,990) during early September. The fall release groups are direct release and are surplus to what is needed to meet the smolt production goal of 330,000. Details regarding the number (and pounds) of fish stocked into each designated water body is provided in Tables 3.

9.4) Location(s) of release

As seen in Table 3, since 1990, summer steelhead have been released into Little Sheep Creek, a tributary to Big Sheep Creek, and the Imnaha River. Smolt releases into Little Sheep Creek have comprised a significant portion of each broodyears' production: between 61-91%. From 1990 to 1998, all steelhead released into Little Sheep Creek were of smolt age, and were released in the spring, approximately one year after parent fertilization. Beginning in 1998 juvenile steelhead (of fingerling size) were released in the fall, after being reared in the hatchery environment for 5-6 months.

From 1991 to 1995, summer steelhead were released directly into the mainstem Imnaha River. These releases comprised approximately 15-22% of broodyear production and averaged 6.51 fish/lb (see Table 3).
Beginning in 1998, summer steelhead juveniles have been released into Big Sheep Creek during the fall. In 1998, they comprised only 1% (5,015 fish) of total broodyear production, but in 1999 this releases group increased to 90,000 fish.
Table 3. Summer steelhead releases into the Imnaha River subbasin (broodyears 1990 to 1999). All data extrapolated from ODFW HMIS database.


Brood

Year

Facility

Release

Date

Location

Number Released

Lbs. Released

Number/lb.

1990

Irrigon H

Irrigon H

Little Sheep Cr.

Irrigon


11/21/90

04/23/91


04/23/91

05/01-05/03/91


Snake River - 1

Little Sheep Cr.

Little Sheep Cr.

Little Sheep Cr.


71,698

50,581


192,401

86,235


1,256

7,903


37,505

14,373


57.08

6.40


5.13

6.00


1991

Irrigon H

Little Sheep Cr.

Irrigon


04/27/92

04/27/92


05/01/92

Little Sheep Cr.

Little Sheep Cr.

Imnaha R.


53,372

196,560


28,917

8,586

35,100


3,484

6.10

5.60


8.30

1992

Irrigon H

Little Sheep Cr.

Irrigon


04/28/93

04/28/93


04/29/93

Little Sheep Cr.

Little Sheep Cr.

Imnaha R.


48,725

237,969


53,692

8,479

43,267


8,849

5.75

5.50


6.07

1993

Irrigon H

Little Sheep Cr.

Irrigon


04/25/94

04/25/94


04/26/94

Little Sheep Cr.

Little Sheep Cr.

Imnaha R.


47,965

252,819


49,767

9,405

54,019


9,390

5.10

4.68


5.30

1994

Irrigon H

Irrigon H

Little Sheep Cr.


04/28/95

05/01/95


05/01/95

Imnaha R.

Little Sheep Cr.

Little Sheep Cr.

50,676

57,012


230,882

7,369

10,653


45,271

6.88

5.35


5.10

1995

Irrigon H

Little Sheep Cr.



04/15/97

05/13/97


Little Sheep Cr.

Little Sheep Cr.



56,566

268,537


10,608

49,729


5.05

5.40


1996

Little Sheep Cr.

Little Sheep Cr.



04/15/97

05/13/97


Little Sheep Cr.

Little Sheep Cr.



208,937

118,524


39,422

23,705


5.30

5.00

1997


Little Sheep Cr.

04/26/98

Little Sheep Cr.

117,096

24,264

4.83

1998

Irrigon H

Little Sheep Cr.

Little Sheep Cr.


11/04/98

04/13/99


05/18/99

Big Sheep Cr.

Little Sheep Cr.

Little Sheep Cr.


5,015

215,294


119,378

85

45,135


22,107

59.00

4.77


5.40

1999

Irrigon H

Irrigon H



09/09/99

09/10/99


Big Sheep Cr.

Little Sheep Cr.



90,000

59,990


720

480

125.00

124.98





    1. Acclimation procedures

Currently, 330,000 pre-smolts are transferred from Irrigon Hatchery in March and April and acclimated at Little Sheep Creek facility for at least three weeks, before being released into the Little Sheep Creek. March release groups are volitionally released and April release groups are force released following a 24 hour volitional opportunity (AOP, 1999).
9.6) Number of fish released

Summer steelhead hatchery releases since 1990 brood year is reported in Table 3. Fingerling in excess to smolt production goals may be released in the fall.


9.7) Marks used to identify hatchery adults

Since 1992, all juvenile summer steelhead released for this program have been externally marked with an adipose fin clip to identify hatchery fish among all returning adults. In 1999, 50,000 fish from the Little Sheep Creek release group (15% of total release group), will be tagged with a coded-wire tag in addition to the adipose fin clip (Ad+CWT). All fall releases are adipose fin clipped.


9.8) Unknowns
References:

AOP. 1999. Lower Snake Program Annual Operation Plan (February 1, 1999 to January 31, 2000). Oregon Department of Fish and Wildlife, Portland, Oregon. 28pp.

Biological Assessment for the Operation of Hatcheries funded by the National Marine Fisheries Service Under the Columbia River Fisheries Development Program (BiOp). 1999. NMFS, Sustainable Fisheries Division, Portland, OR.

IHOT (Integrated Hatchery Operations Team). 1996. Operation Plans for Anadromous Fish Production Facilities in the Columbia River Basin. Volume II-Oregon. Annual Report 1995. Portland, OR. Project Number 92-043, Contract Number DE-BJ79-91BP60629.

IHOT (Integrated Hatchery Operations Team). 1995. Policies and Procedures from Columbia Basin Anadromous Salmonid Hatcheries. Annual Report 1994. Portland, OR. Project Number 92-043, Contract Number DE-B179-92BP60629.

Keniry, P. 1999. Evaluation of lower Snake River compensation plan facilities in Oregon. Oregon Department of Fish and Wildlife, Unpublished data, Portland, Oregon.

Lewis, M.A. 1996. Review of capacity utilization at ODFW salmon hatcheries. Oregon Department of Fish and Wildlife, Information report 96-8, Portland, Oregon.

Marshall, D.B., M. Chilcote, and H. Weeks. (1996). Species at Risk: sensitive, threatened, and endangered vertebrates of Oregon. Oregon Department Fish and Wildlife, Portland. Second edition.

Nandor, G.F. 1995. Operation plans for anadromous fish production facilities sin the Columbia River basin. Integrated Hatchery Operations Team (IHOT). U.S. Dept. of Energy, BPA Annual Report. Portland, Oregon.

Nez Perce Tribe of Idaho, Confederated Tribes of the Umatilla Indian Reservation, and Oregon Department of Fish and Wildlife. 1990. Imnaha River subbasin salmon and steelhead production plan. Columbia Basin System Planning Report to the Northwest Power Planning Council, Portland, Oregon.

Olsen, E.A., P.M.P. Beamesderfer, M.L. McLean, and E.S. Tinus. 1994. Salmon and steelhead

stock summaries for the Imnaha River Basin: An interim report. Oregon Department of Fish and Wildlife, Portland, Oregon.

Oregon Department of Fish and Wildlife. 1993. NE Region Stock Status Review. 1992 Annual Report. Portland, OR.

Oregon Department of Fish and Wildlife. 1995. Steelhead Plan-Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout. Portland, OR.

Oregon Department of Fish and Wildlife. 1999. Lower Snake Program Annual Operation Plan, February 1, 1999 to January 31, 2000. Portland, OR.

Parker, S.J., M. Keefe, and R.W. Carmichael. 1995. Natural escapement monitoring of spring chinook salmon in the Imnaha and Grande Ronde River basins. Oregon Department of Fish and Wildlife, Annual Progress Report, Portland, Oregon.

Parker, S.J., and M. Keefe. 1997. Natural escapement monitoring of spring chinook salmon in the Imnaha and Grande Ronde River basins. Oregon Department of Fish and Wildlife, Unpublished data, Portland, Oregon.


TAC (United States v. Oregon, Technical Advisory Committee). 1997. 1996 All Species Review - Columbia River Fish Management Plan.


1 LSRCP used 5.5% of the peak (1957) escapement over McNary Dam to estimate spring/summer chinook returns into the Imnaha

2 Much of the discussion by USDA Forest Service uses rating criteria developed by the NMFS in their Section 7 consultation process. Refer to Appendix E for rating criteria.




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