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Table 1 Mortality events for groups in Experiments 1, 2 and 3 where the unit of interest was the individual tray segment or basket on a long line

From: Counting the dead to determine the source and transmission of the marine herpesvirus OsHV-1 in Crassostrea gigas

Experiment

Site

Age of oysters (months)

Length of oysters (mm, mean ± sd)

Group

No. of units (baskets or tray segments)

No. of oysters per unit

% units affected

Days of onset

No. units affected on each onset day

Final mortality % within units (range among units)

Baskets

 1

A

8

14

37 ± 4; 73 ± 16

49 ± 3; 79 ± 12

1

24

50

100

33, 40

16, 8

23.8–97.6

 1

C

8

14

37 ± 4; 73 ± 16

49 ± 3; 79 ± 12

2

24

50

33

11, 19, 26

2, 5, 1

0–95.2

 2

B

8

17

30 ± 9; 48 ± 17

59 ± 9; 69 ± 11

3

24

50

88

11, 19

11, 10

8.5–100

 2

C

8

17

30 ± 9; 48 ± 17

59 ± 9; 69 ± 11

4

24

50

88

11, 19, 26

15, 5, 1

4.3–100

 3

A

9.5

50 ± 5

5

12

90

75

40, 47, 56, 76, 89, 174

1, 1, 3, 2, 1, 1

0–88.9

 3

A

9.5

50 ± 5

6

12

90

100

11, 19, 26, 33, 47, 174

1, 1, 3, 5, 1, 1

31.1–100

 3

A

9.5

50 ± 5

7

12

90

100

26

12

32.2–100

 3

B

9.5

50 ± 5

8

12

90

83

61, 76, 89, 105, 147

1, 4, 1, 1, 2

0–100

 3

B

9.5

50 ± 5

9

12

90

100

47, 56, 61, 76, 118

1, 2, 1, 5, 3

32.2–80.0

 3

B

9.5

50 ± 5

10

12

90

92

47, 56

5, 6

10.0a–80.0

 3

C

9.5

50 ± 5

11

12

90

92

11, 118, 147

2, 1, 8

5.6–90.0

 3

C

9.5

50 ± 5

12

12

90

92

47, 118, 147, 174

1, 3, 6, 1

6.7–77.8

 3

C

9.5

50 ± 5

13

12

90

92

47, 56, 61, 76, 174

2, 3, 2, 3, 1

0–80

Trays

 3

A

17.5

92 ± 6

14

8

40

88

76, 174

2, 5

7.5–30.0

 3

A

17.5

92 ± 6

15

8

40

88

33, 174, 214

1, 3, 3

12.5a–30.0

 3

A

17.5

92 ± 6

16

8

40

100

26, 174

7, 1

25.0–57.5

 3

A

17.5

92 ± 6

17

8

40

100

26

8

25.0–52.5

 3

A

9.5

50 ± 5

18

8

40

100

33, 174

3, 5

27.5–60.0

 3

A

9.5

50 ± 5

19

8

40

100

11, 19, 26

1, 1, 6

22.5–82.5

 3

A

9.5

50 ± 5

20

8

40

100

11, 19, 26

5, 2, 1

45.0–80.0

 3

A

9.5

50 ± 5

21

8

40

100

11, 19

2, 6

55.0–100

 3

B

17.5

92 ± 6

22

8

40

88

56, 147, 174

3, 1, 3

17.5–35.0

 3

B

17.5

92 ± 6

23

8

40

100

47, 56, 174, 214

1, 5, 1, 1

22.5–40.0

 3

B

17.5

92 ± 6

24

8

40

100

33, 47, 147

1, 6, 1

30.0–50.0

 3

B

17.5

92 ± 6

25

8

40

100

40, 47

2, 6

40.0–55.0

 3

B

9.5

50 ± 5

26

8

40

100

47, 56

7, 1

32.5–65.0

 3

B

9.5

50 ± 5

27

8

40

100

47, 56, 76

3, 4, 1

32.5–60.0

 3

B

9.5

50 ± 5

28

8

40

100

33, 40, 47

5, 1, 2

30.0–70.0

 3

B

9.5

50 ± 5

29

8

40

100

33, 40, 47

1, 4, 3

45.0–72.5

 3

C

17.5

92 ± 6

30

8

40

88

47, 174, 214

2, 3, 2

7.5–42.5

 3

C

17.5

92 ± 6

31

8

40

75

174

6

7.5–37.5

 3

C

17.5

92 ± 6

32

8

40

88

47, 76, 147, 174

2, 1, 2, 2

12.5a–45.0

 3

C

17.5

92 ± 6

33

8

40

100

33, 40, 47, 56, 76, 147

2, 1, 2, 1, 1, 1

30.0–47.5

 3

C

9.5

50 ± 5

34

8

40

100

33, 47, 56, 61, 174

2, 1, 2, 1, 2

37.5–75.0

 3

C

9.5

50 ± 5

35

8

40

100

33, 47, 76, 174

5, 1, 1, 1

32.5–65.0

 3

C

9.5

50 ± 5

36

8

40

100

33, 40

5, 3

55.0–70.0

 3

C

9.5

50 ± 5

37

8

40

100

33, 40, 56

6, 1, 1

42.5–65.0

  1. A case was defined as mortality in a basket or tray segment affecting > 10% of oysters between two consecutive observations, and confirmation of the presence of OsHV-1 by quantitative PCR. The final mortality among individual oysters in baskets or tray segments in the group is also shown.
  2. Mortality data from Hick et al. [38] and Whittington et al. [37].
  3. aOne unit in this group had ≥ 10% cumulative mortality due to occasional mortalities over the duration of the trial, but did not experience ≥ 10% new mortality between any two observations.
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Veterinary Research

ISSN: 1297-9716