TABLE 2.
System and farm | Previous origin
|
Sample no. | Sample date | nb | Fish weight (g) | Prevalence (%) | MIc | |
---|---|---|---|---|---|---|---|---|
Hatchery | Preongrowing | |||||||
Sea cages | ||||||||
F1 | H-3 | H-3 | 1a | Mar 1999 | 19 | 21.2 ± 4.7 | 0 | 0 |
2 | Jul 1999 | 20 | 92.3 ± 12.9 | 55 | 4 | |||
3 | Oct 1999 | 28 | 222.8 ± 35.0 | 3.6 | 1 | |||
4 | Feb 2000 | 20 | 313.5 ± 53.3 | 0 | 0 | |||
5 | Jul 2000 | 19 | 339.7 ± 50.1 | 0 | 0 | |||
F2 | H-1 | PGF1 | 1a | Apr 1999 | 31 | 8.4 ± 7.2 | 3.2 | 2 |
2 | Jul 1999 | 16 | 41.0 ± 16.1 | 31.7 | 1.5 | |||
3 | Oct 1999 | 20 | 110.3 ± 19.5 | 0 | 0 | |||
4 | Jan 2000 | 20 | 142.3 ± 31.1 | 0 | 0 | |||
5 | Apr 2000 | 20 | 176.6 ± 38.6 | 0 | 0 | |||
6 | Jul 2000 | 17 | 281.3 ± 48.3 | 0 | 0 | |||
Total | 230 | 6.5 | 3.3 | |||||
Earth ponds, F6 | H-2 and H-3 | H-2 and H-3 | 1a | June 1999 | 22 | 2.1 ± 0.9 | 0 | 0 |
2 | Sept 1999 | 34 | 59.4 ± 12.9 | 0 | 0 | |||
3 | Dec 1999 | 39 | 119.2 ± 24.7 | 5 | 1.5 | |||
4 | Apr 2000 | 20 | 143.0 ± 31.9 | 10 | 1 | |||
5 | Jul 2000 | 20 | 201.8 ± 7.3 | 0 | 0 | |||
6 | Oct 2000 | 22 | 414.0 ± 76.5 | 0 | 0 | |||
Total | 157 | 2.5 | 1.25 | |||||
Indoor tanks | ||||||||
IATS-1 | H-3 | H-3 | 1a | Mar 1999 | 19 | 21.2 ± 4.7 | 0 | 0 |
2 | June 1999 | 41 | 72.6 ± 16.3 | 0 | 0 | |||
3 | Sept 1999 | 35 | 266.1 ± 59.1 | 0 | 0 | |||
IATS-2 | H-3 | H-3 | 1 | Jun 1999 | 20 | 9.1 ± 2.1 | 0 | 0 |
2 | Sept 1999 | 38 | 85.0 ± 16.3 | 0 | 0 | |||
3 | Dec 1999 | 34 | 157.3 ± 27.5 | 0 | 0 | |||
4 | Apr 2000 | 38 | 199.8 ± 44.1 | 42.1 | 4 | |||
5 | Jul 2000 | 30 | 349.3 ± 54.1 | 10 | 4 | |||
Total | 244 | 7.8 | 4 |
Sampling carried out before introduction in the ongrowing system.
n, number of fish examined.
MI, mean intensity of infection.