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Table 1. Compositions of the experimental diets for rainbow trout (%)

Ingredient

Diet no.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

Casein

54

54

54

54

40

40

40

40

30

30

30

30

20

20

20

20

0

 

α-Starch

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

Dextrin

16

11

6

1

16

16

16

16

16

16

16

16

16

16

16

16

23

Lipid*1

5

10

15

20

5

10

15

20

5

10

15

20

5

10

15

20

20

Cellulose

5

5

5

5

19

14

9

4

29

24

19

14

39

34

29

24

37

Mineral mix*1

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

Vitamin mix*1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

¡¡

Nutrient content

Protein

48.7

48.6

48.7

47.9

35.8

36.5

35.9

35.4

26.3

26.5

25.9

24.4

18.2

17.5

16.3

17.5

0.4

(N×6.25)

¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡ ¡¡

Lipid

5.2

10.8

15.6

19.3

5.4

10.8

14.9

18.9

5.6

10.3

14.9

18.5

5.0

10.7

15.0

20.3

20.5

*1 Soybean oil: Pollock liver oil=3:2

*2 McCollum salt mixture no. 185 fortified with trace elements.

*3 Composition is the same as that reported previously.

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Table 2. Results of 30 days of the feeding experiment

Diet no.

No. of fish

Av body wt (g)

Percent gain

Feed

Conversion

(ggain/g feed)

Initial

Final

1.

35

2.44

5.60

129.5

1.27

2.

35

2.45

5.74

134.3

1.34

3.

35

2.47

5.84

136.4

1.39

4.

35

2.33

6.32

171.2

1.40

5.

35

2.27

4.85

113.7

1.00

6.

35

2.45

5.47

123.3

1.15

7.

35

2.28

5.43

138.2

1.15

8.

35

2.23

5.40

132.8

1.22

9.

35

2.34

4.20

79.5

0.73

10.

35

2.26

4.51

99.6

0.85

11.

35

2.23

4.72

111.7

0.98

12.

35

2.28

4.69

105.7

0.98

13.

35

2.25

3.22

43.1

0.49

14.

35

2.36

3.62

53.4

0.62

15.

35

2.20

3.60

63.6

0.68

16.

35

2.36

3.80

61.0

0.70

17.

35

2.20

2.21

0.5

0.01

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Table 3. Protein and lipid retained in the bodies , protein efficiency ratio (PER) and net protein utilization (NPU)

Diet no.

Crude

protein

in diet

(%)

Crude

lipid

in diet

(%)

Diet

consumed

(%)

Protein*

retained

(%)

Lipid*

retained

(%)

PER

NPU

1.

48.7

5.2

84.3

37.5

207.8

2.62

41

2.

48.6

10.8

86.3

41.2

148.9

2.75

44

3.

48.7

15.6

82.0

42.5

128.2

2.85

46

4.

47.9

19.3

95.9

43.9

118.9

3.06

47

5.

35.8

5.4

95.0

42.1

162.6

2.72

46

6.

36.5

10.8

94.6

42.8

117.9

2.89

47

7.

35.9

14.9

93.9

44.1

114.7

3.24

48

8.

35.4

18.9

89.2

44.6

103.4

3.43

49

9.

26.3

5.6

94.3

43.4

102.0

2.78

49

10.

26.5

10.3

100.2

43.4

97.4

3.21

48

11.

25.9

14.9

88.2

46.5

93.4

3.74

52

12.

24.4

18.5

85.9

48.8

104.3

3.73

55

13.

18.2

5.0

72.0

37.0

92.0

2.69

47

14.

17.5

10.7

73.8

44.1

72.5

3.52

54

15.

16.3

15.0

66.9

48.8

71.0

4.13

59

16.

17.5

20.3

69.6

48.6

77.9

3.97

60

17.

0.4

20.5

36.2

---

24.2

---

---

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Table 4. Proximate compositions of the whole bodies (%)

¡¡

Diet no.

Moisture

Protein

Lipid

Ash

Initial

77.6

14.9

4.2

2.3

1.

74.8

15.4

7.1

2.3

2.

73.5

15.1

8.9

2.4

3.

72.0

15.1

10.3

2.4

4.

71.7

14.6

11.5

2.3

5.

75.3

15.4

6.9

2.4

6.

73.3

15.1

8.8

2.4

7.

71.9

14.6

10.7

2.4

8.

71.2

14.3

12.6

2.4

9.

74.8

15.4

6.0

2.6

10.

74.1

15.0

8.7

2.4

11.

72.0

14.3

10.4

2.4

12.

70.7

14.2

12.5

2.4

13.

77.1

14.9

6.2

2.6-

14.

74.5

14.8

7.9

2.6

15.

73.0

14.1

9.2

2.4

16.

71.7

14.0

11.4

2.4

17.

76.5

13.2

6.8

2.5

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Table 5. Lipid content of each part of the fish bodies

Diet no.

Weight of each part (%)

Lipid content (%)

Viscera

Flesh

Residue

Whole

body

Viscera

Flesh

Residue

Initial

9.1

35.7

55.3

4.2

10.0

2.6

4.9

1.

11.2

35.0

53.9

7.1

14.0

3.3

7.4

2.

11.4

36.7

51.9

8.9

18.0

4.5

8.9

3.

11.6

37.5

50.9

10.3

20.7

5.6

10.2

4.

12.2

38.2

49.6

11.5

20.7

6.9

11.5

5.

12.4

36.2

51.4

6.9

13.9

3.6

7.3

6.

13.1

37.8

49.1

8.8

19.7

4.6

8.7

7.

13.2

37.7

49.1

10.7

21.8

5.6

10.0

8.

14.1

37.5

48.3

12.6

23.9

6.4

11.0

9.

13.7

35.8

50.5

6.0

13.1

3.7

7.0

10.

14.9

37.1

47.9

8.7

16.2

4.8

8.5

11.

15.4

37.6

45.0

10.4

22.1

5.9

9.4

12.

15.3

39.0

45.7

12.5

25.5

6.2

10.2

13.

14.8

37.4

47.8

6.2

10.6

3.1

6.2

14.

15.4

38.8

45.8

7.9

14.5

4.8

8.4

15.

17.4

37.4

45.3

9.2

17.6

5.4

8.6

16.

18.0

37.1

44.9

11.4

21.9

6.2

9.8

17.

14.5

36.5

49.0

6.8

19.9

4.4

6.8

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(Òë×ÔBulletin of the Japanese Society of Scientific Lisheries 1978)



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