Volume 12, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Laboratory studies on the biology of , snail vector of , revealed that the period from hatching to laying may be as brief as 3 weeks. Allowing 8 to 9 days for incubation of eggs, the egg-to-egg cycle is potentially 1 month. In one experiment the mean diameter at maturity was 12.8 mm. The best growth rate, obtained with snails in continuously changing tap water, was 20 mm in 2 months. These results are believed to approach the biological potentials of —they are consistent with limited field observations on growth; they explain the profound capacity of the snail for repopulation after stress of natural conditions and mollusciciding; and they are pertinent to the epidemiology of the disease.


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