Skip to main content

Table 1 Feeding regime, mortality and mean body weight during the experimental period, experiment II

From: Growth reaction norms of domesticated, wild and hybrid Atlantic salmon families in response to differing social and physical environments

Physical treatment

Tank

nstart

~week 0

Start-feeding (week 0 – 5)

Week 6 - 10

Week 11 - 15

Week 16 – 20 (termination)

M (%)

M

W(g)

DD

F (%)

M

W(g)

DD

F (%)

M

W(g)

DD

F (%)

M

W(g)

DD

F (%)

M

W(g)

DD

Mean

SD

Hatchery

1

1450

25

0.19

269

110

59

0.93

711

110

9

3.05

1128

110

14

9.61

1583

110

19

22.78

11.76

1996

8.7

control

2

1630

17

0.19

269

110

47

0.92

711

110

7

2.85

1128

110

9

10.06

1583

110

18

21.66

12.03

2017

6.0

Restricted

3

1270

18

0.19

269

75

58

0.91

711

25

25

1.48

1128

50

190

3.58

1583

50

71

7.76

6.3

2006

28.5

hatchery

4

1450

28

0.19

269

75

37

0.94

711

25

57

1.48

1128

50

239

2.71

1583

50

66

7.07

6.11

2028

29.4

   

Week 1

Start-feeding (week 1 – 8)

Week 9 - 12

Week 13 - 18

Week 19 – 20 (termination)

 

M

W(g)

DD

F (%)

M

W(g)

DD

F (%)

M

W(g)

DD

F (%)

M

W(g)

DD

F (%)

M

W(g)

DD

Mean

SD

Restricted

5

1450

NA

NA

269

75

NA

NA

712

25

NA

NA

1125

25

NA

NA

1602

25

1377

11.01

5.98

1795

95.0

semi-natural

6

1450

NA

NA

269

75

NA

NA

712

25

NA

NA

1125

25

NA

NA

1602

25

1267

9.08

4.51

1795

87.4

  1. M; mortality (n). W; weight (gram). DD; degree day post median time of hatch. F; feeding regime (percent of the recommended feeding regime given by the commercial industry); M (%); percentage mortality throughout the experiment. Feed were adjusted once a week in tank 1 – 4, while tank 5 and 6 were adjusted at the corresponding degree day. Due to high mortality in the restricted hatchery treatment, the feeding regime was revised in week 11, while kept constant in the restricted semi-natural treatment. Weight measurements during the experimental period is based upon a bulk weight of 100 individuals, while weight at termination is based upon the sampled individuals that were identified to family for further growth comparisons. Initially each tank contained 1450 individuals, while in week 1, approximately 180 individuals were accidentally transferred from tank 3 to tank 2 during weight measurement. In week 1, mean individual weight in tank 1 – 4 was similar (i.e., 0.22 gram). Weight measurements are given for week 5, 10, 15 and 20, respectively.