Abstract
For 3 yr, populations of Marisa cornuarietis, the ampullarid snail used in bilharzia control, were monitored in 28 hydroelectric and multi‐purpose reservoirs in Puerto Rico to establish the habitat requirements for this biological control agent. The information can be used to estimate the fate of this ampullarid snail if it is introduced into hydroelectric reservoirs in other countries. The major factors determining habitat suitability were water temperature, the area of submerged shore which supported vegetation, and the rate or recession of the reservoir level. The ampullarid had established itself in 22 of the 28 reservoirs.
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