Equations for describing growth of the schistosome host snail Biomphalaria glabrata.

Biomphalaria glabrata and Stagnicola palustris were raised in aquaria under crowded and uncrowded conditions. Measurements of greatest shell diameter were taken at regular intervals. Von Bertalanffy and logistic growth curves were fitted by least squares and maximum likelihood methods. The resulting parameter estimates produced better fits for the logistic equation than for the von Bertalanffy equation.