TECHNIQUES FOR ESTIMATING DENSITIES OF BULINUS-TRUNCATUS ROHLFSI AND ITS HORIZONTAL DISTRIBUTION IN VOLTA LAKE, GHANA

  • 1 January 1976
    • journal article
    • research article
    • Vol. 54  (4) , 411-416
Abstract
B. truncatus rohlfsi is the intermediate host of urinary schistosomiasis, which is highly endemic in the man-made Volta Lake. In 1971, a WHO/UNDP [United Nations Development Program] schistosomiasis project was established in the Pawmpawm branch and part of the Afram branch of Volta Lake. Malacological findings of the preliminary phase indicated that the snails were distributed in the littoral zone of the lake, and that this distribution was correlated with the presence of vegetation, especially Ceratophyllum. Transmission nearly always occurred in water contact sites, i.e., places where people come into contact with water. A snail-sampling technique with palm-leaf mats was developed and standardized after it was shown in sensitivity trials to compare favorably with a modified version of the man-time sampling method, in which the number of snails collected per man-hour is recorded. Both methods should be used to conduct ecological studies of B. rohlfsi in water contact sites.

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