Table 1.
Egg-laying of Radix natalensis (Egypt) subjected to two successive exposures (2 miracidia per snail in each case) with Fasciola hepatica (France). Each group consisted of 50 snails at the onset of the experiment. CS snails, cercarial-shedding snails; n, total number of surviving snails at week 4; NCS snails, snails containing free cercariae but without shedding.
| Parameters | Unexposed controls (n = 48) | Exposed group (n = 45) |
||
|---|---|---|---|---|
| Uninfected snails | NCS snails | CS snails | ||
| Number of snails at week 4 | 48 | 21 | 13 | 11 |
| Shell height at week 8 (mm)* | 6.7 ± 1.1 | 7 ± 1.6 | 7.3 ± 2.7 | 7.2 ± 1.1 |
| Life span of snails (days)* | 138.2 ± 8.3 | 135.4 ± 23 | 93.7 ± 17.3 | 92.0 ± 7.6 |
| Time between exposure and the first egg-laying (days)* | 63.5 ± 9.3 | 65.3 ± 17.0 | 61.9 ± 29.2 | 56.4 ± 7.8 |
| Length of the egg-laying period (days)* | 74.7 ± 4.0 | 70.1 ± 19.5 | 31.8 ± 21.7 | 35.6 ± 7.5 |
| Total number of egg masses* | 24.9 ± 5.8 | 21.1 ± 7.5 | 9.2 ± 6.2 | 4.4 ± 2.1 |
| Total number of eggs per surviving snail* | 281.5 ± 108.9 | 237.4 ± 109.6 | 94.0 ± 81.5 | 32.4 ± 23.1 |
| Number of eggs per egg mass* | 11.3 ± 6.8 | 11.5 ± 4.6 | 10.3 ± 4.7 | 6.8 ± 4.9 |
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