SOME FACTORS AFFECTING THE FECUNDITY OF BIOMPHALARIA PFEIFFERI (KRAUSS) IN GLASS AQUARIA.

Little being known of the effect of artificial conditions on Biomphalaria snails maintained in laboratory aquaria, experiments were conducted to determine some of the basic requirements of these snails, expressed in terms of the influence of various factors on their growth, fecundity and mortality. Among the factors studied were diet, artificial aeration, the chemical and physical properties of the water, and the presence of human urine in the water.The results obtained suggest that a diet of dehydrated lettuce and lucerne, no artificial aeration, a CaCO(3) concentration of approximately 18 p.p.m., a sodium/calcium ratio of 1, and mild "pollution" give optimum fecundity and growth and low mortality with Biomphalaria pfeifferi (Krauss).