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a Egg-to-fry survival estimate was adjusted to include eggs lost when delivery of water to the incubation trays failed and adjusts for fry that were destroyed because of a reduction in program goals.

b Survival estimate are based on green egg-to-fry or smolt stage. Fry numbers are from the monthly hatchery report, smolt numbers are from the coded-wire tag report.

c Survival estimate includes fish that were destroyed because of a reduction in program goals.

Table 12. Rearing conditions immediately before transfer for summer steelhead in Michigan raceways at Umatilla Hatchery and in Oregon raceways at Irrigon Hatchery during 1991-98.




Brood

year

System

Maximum density (lb./ft3)

Maximum loading (lb./gal/min)

1991

Michigan

5.4-6.7

11.8-14.6

1991

Oregon

1.3

6.6

1992

Michigan


4.0-4.5

8.9-9.9

1992

Oregon

1.3

6.6

1993

Michigan

3.8-4.6

8.4-10.1

1993

Oregon

1.4-1.5

6.7-7.4

1994

Michigan

4.0-4.2

9.7-10.2

1994

Oregon

1.3-1.4

7.3-10.4

1995

Michigan

4.1-4.3

9.8-10.4

1995

Oregon

1.2-1.4


5.9-6.9

1996

Michigan

3.4-3.9

8.1-9.3

1996

Oregon

1.3-1.5

7.1-8.0

1997

Michigan

3.7-3.8

8.7-9.1

1997

Oregon

1.3-1.5

7.1-8.0

Table 13. Mean proportion of descaled, partially descaled, and undamaged summer steelhead reared in Michigan passes at Umatilla Hatchery, brood years 1991 - 1997.


Brood Smolts Partially
Year Pass (%) Descaleda Descaledb Undamagedc

1991 A 0.01 0.43 0.56


1991 B 0.05 0.39 0.61

1991d C

1992 A 0.08 0.30 0.62

1992 B 0.03 0.56 0.41
1992 C 0.02 0.58 0.40

1993 A 66.0 0.05 0.13 0.82


1993 B 29.0 0.01 0.50 0.49
1993 C 66.0 0.11 0.33 0.56

1994 A 23.0 0.13 0.39 0.48


1994 B 45.0 0.00 0.21 0.79
1994 C 61.0 0.09 0.42 0.50

1995 A 8.0 0.03 0.70 0.28


1995 B 8.0 0.01 0.31 0.69
1995e C 8.0

1996 A 45.9 0.12 0.48 0.41


1996 B 4.4 0.02 0.35 0.63
1996 C 1.5 0.32 0.57 0.11

1997 A 9.3 0.00 0.04 0.96


1997 B 1.5 0.04 0.32 0.64
1997 C 2.8 0.05 0.34 0.61

1998 A 0.0 0.12 0.03 0.85


1998 B 0.0 0.06 0.00 0.94
1998 C 0.9 0.15 0.01 0.84

a More than 0.20 descaling on either side of the fish.

b Descaling = 0.03 to 0.20 on either side of the fish.

c Less than 0.03 descaling on either side of the fish.

d Data not available.

e The 1995 brood steelhead from pond M8C escaped from the acclimation pond prior to sampling.

Table 14. Age summary of natural summer steelhead from the Umatilla River.



Return




Age

Age

Age

Age

Age

Age

Age

Age




Year




1.1

1.2

2.1

2.2

2.3

3.1

3.2

4.1

Total

1994

n=

0

2

24

26

0

5

6

0

63




%=

0

3.2

38.1

41.3

0

7.9

9.5

0

100

1995

n=

0

0

19

17

0

9

11

0

56




%

0

0

33.9

30.4

0

16.1

19.6

0

100

1996

n=

0

0

28

8

0

7


1

0

44




%

0

0

63.6

18.2

0

15.9

2.3

0

100

1997

n=

0

0

19

17

0

5

10

0

51




%

0

0

37.3

33.3

0

9.8

19.6

0

100

1998

n=

1

1


33

11

1

4

0

1

52




%

1.9

1.9

63.5

21.2

1.9

7.7

0

1.9

100


































Juvenile years of freshwater growth from scales of adult steelhead returning to the Umatilla River.

Return




Age

Age

Age


Age
















Year




1

2

3

4

Total













1994

n=

2

50

11

0

63
















%=

3.2

79.4

17.4

0

100













1995

n=

0

36


20

0

56
















%

0

64.3

35.7

0

100













1996

n=

0

36

8

0

44
















%

0

81.8

18.2

0

100













1997

n=

0


37

15

0

51
















%

0

70.6

29.4

0

100













1998

n=

2

45

4

1

52
















%

3.8

86.5

7.7

1.9

99.9











Table 15. Life History table of steelhead

Mouth of the Umatilla to the mouth of McKay Creek (RM 0-50.5)

Life History Stage

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Adult Migration

x

x

x

x

x

x

x

x













Prespawning Holding



































Spawning





































Incubation





































Rearing

x

x

x

x

x

x

x

x

x

x

x


x

Juvenile Migration

x

x

x

x

x

x

x

x

x











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