THE TEMPERATURE AND ILLUMINATION INFLUENCE ON THE BIOLOGY OF PHILOPHTHALMUS-RHIONICA MIRACIDIA

The influence of temperature and elumination on the process of mature eggs production from the uterus of adults of Philophthalmus rhionica a nd on the hatching of miracidia has been investigated. Elumination in contrast to the temperature does not play a great role. The temperatur e factor also defines the larvae duration life and the velocity of the ir swimming and has some influence on the invasiability of miracidia, which is enhanced with heating. The data receaved does not confirm the position of Semenov (1977) that in the presence of simultaneous influ ence of light and temperature the influence of the former factor upon the infection of the frsh-water mollusk Melanopsis praemorsa is more s ignificant.