engleski

Effects of calcium chloride and calcium bromide solutions on fecundity, mortality and growth to the freshwater snail Planorbarius corneus L.

Concentrated solutions of MERCK chemicals, calcium chloride and calcium bromide, being cleaner than technically prepared solutions were used in this study. Concentrated splutions of these chemicals and their mixture are regularly used to control the hydrostatic pressure in oil wells. The toxicity of some sublethal concentrations of these chemicals and their mixture to the fecundity, mortality and growth of the Planorbarius corneus L. has been researched. During the chronic exposure (six weeks) in all different concentrations of these toxicants, a reduced fecundity was revealed, at a slover speed in the test solutions then in the controls with standard water. The rate, for which reason the test was interrupted after five weeks. A higher mortality was ascertained in other tests then in the controls. All chages were formed to be reversible when the snails were no longer exposed to the action of the toxicants.

Planorbarius corneus L.; calcium chloride; calcium bromide; fecundity; toxicity

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