Table 2.
Numbers of Fasciola hepatica cercariae counted during days of thermal shock for temperature-challenged (TC) snails and the corresponding days for controls, with indication of time intervals between the end of thermal shock and the beginning of cercarial emergence. The number of cercariae-releasing (CR) snails in each subgroup is given in Table 1.
| Snail subgroups | Cercariae of F. hepatica
|
|||
|---|---|---|---|---|
| Total number | Frequency (%) | Mean number (SD) per CR snail | Mean time interval (SD) | |
| Experiment A (thermal shock of TC snails done outdoors) | ||||
| Thenay, controls | 3306 | 57.78 | 89.3 (41.2) | – |
| Thenay, TC snails: | ||||
| 3000-lux artificial light | 6746 | 78.58 | 204.4 (71.9) | 3 h 02 min (57 min) |
| natural light | 11,673 | 84.45 | 299.3 (81.2) | 1 h 45 min (35 min) |
| Chitray, controls | 2289 | 43.92 | 76.3 (37.9) | – |
| Chitray, TC snails: | ||||
| 3000-lux artificial light | 6612 | 57.75 | 178.7 (58.3) | 3 h 37 min (41 min) |
| natural light | 9809 | 72.39 | 288.5 (76.0) | 1 h 21 min (24 min) |
| Experiment B (thermal shock of TC snails done indoors under artificial light) | ||||
| Chitray, 600 lux | 4886 | 54.93 | 168.4 (47.2) | 3 h 13 min (46 min) |
| Chitray, 1200 lux | 6507 | 56.11 | 197.1 (72.8) | 2 h 56 min (16 min) |
| Chitray, 1800 lux | 6137 | 55.27 | 161.5 (54.7) | 3 h 2 min (29 min) |
| Chitray, 2400 lux | 5040 | 57.76 | 157.5 (45.1) | 3 h 21 (35 min) |
| Chitray, 3000 lux | 5995 | 55.08 | 171.2 (64.3) | 3 h 11 min (32 min) |
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