Table 2.
Reproduction of offspring snails in Zhangjiagang, Jiangsu Province.
| Snail population | April | June | August | October | December | Next February |
|---|---|---|---|---|---|---|
| Nanjing field-derived snails | 60 | 60 | 60 | 800 | 1,334 | 1,610 |
| Laboratory offspring snails | 60 | 60 | 60 | 911 | 1,326 | 1,620 |
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