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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.