Abstract
Haeomolymph ionic concentrations were determined in three freshwater gastropods, Indoplanorbis exustus (Deshayes), Lymnaea acuminata (Lamarck) f. rufescens (Gray), and Pila virens (Lamarck). The influence of age (shell size) on the haemolymph concentrations of Na+, K+, Ca2+ and Cl−, as well as haemolymph osmolality was studied in groups of small, intermediate and large-sized snails of the three species. Sodium -and chloride were found to be the dominant ions in all the three species. In I. exustus and L. acuminata f. rufescens the concentrations of Na+ and K+ ions showed progressive decrease with increase in shell size. In I. exustus calcium concentration was higher in the small size-group snails whereas in L. acuminata f. rufescens it was in the large size-group snails. In P. virens also sodium, potassium and calcium ions showed age-dependent variations in concentration, sodium and calcium concentrations being higher in the large size-group snails, and potassium being higher in the small size-group snails. There was no statistically significant difference in haemolymph concentration of chloride, as in the osmolality among the three sizegroup snails of the three species.
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