Deviation of negatively charged protein fractions in the trochophore and veliger larvae by the larvicidal action of baygon in freshwater pulmonate Gyraulus convexiusculus (Planorbidae).

In the present investigation egg capsules of Gyraulus convexiusculus were treated with different concentrations of baygon. A dose and duration dependent deviations in the number of negatively charged protein fractions in the trochophore and veliger larval stages were observed. It resulted into anomalies in the morphogenesis and organogenesis of corresponding larval stages. Most of the protein bands showed the decrease in the protein positive intensities in comparison to control. This suggested that baygon causes larval toxicity in Gyraulus convexiusculus.

Morphological and biochemical studies on the different developmental stages of a fresh water snail, Lymnaea stagnalis (Lymnaeidae) after treatment with some pesticides.

In the present study when the egg masses of Lymnaea stagnalis showing different developmental stages were introduced with the sub lethal concentrations of baygon and nuvan from cleavage to before hatching stages exhibited the development arrest in most of the egg capsules due to deviation in protein fractions in the corresponding development stages in comparison to control groups resulted into high percentage of mortality and low percentage of hatchability in treated groups. Another potent cause of low percentage of hatchability of young snails from their corresponding egg capsules was the phenomenon of polyembryony in nuvan treated egg masses which showed the high rate of mortality due to the lack of metabolites for their progressive development in comparison to control groups. Teratogenesis and deformities in larval stages were also observed in most of the egg capsules which could be correlated with the depletion of most of the protein fractions in the present investigation.