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۱Pond Snail Lymnaea stagnalis L.: The Implication for Basic and Applied Research
اطلاعات انتشار: World Applied Sciences Journal، بيست و پنجم،شماره۱۰، ۲۰۱۳، سال
تعداد صفحات: ۱۱
The results show that it is possible to maintain marsh snail Lymnaea stagnalis L through the generations, under laboratory conditions, but with the first generation of animals bred in the laboratory from egg masses from the nature, is not infected with parasites. In conditions when egg masses are kept in Petridishes in 50 ml of tap water at a temperature of about 20°C, embryonal development lasts 16 days, the survival rate of embryos is about 90%. During embryonal development, from the 8th day, it is possible to register a summary spon taneous bioelectrical activity of the embryonal nervous system (pedal ganglia). Embryonal growth (longitudinal) and postembryonal growth (longitudinal and weight) mathematically describes the sigmoid curve of growth and length–weight relationship describes the exponential growth function, which turns into a linear logarithmic dependence. The value of the parameter b (line slope of the linear relationship) in our experimental conditions is 2.68 and indicates that under these conditions, weight growth increases proportionally slower than the longitudinal growth (negative allometry of growth). Based on morphological, electrophysiological and pharmacological characteristics of the dorsal surface of the visceral and right parietal ganglia of adult snail identified 9 neurons. Marsh snail Lymnaea stagnalis L. is relatively good indicator (in– dicator weight G 3) of – mezosaprobic zones (relatively pure water) of aquaticecosystems, where it is most commonly found, but it also habitates in oligosaprobic (pure water) and mezosaprobic zone (pollution–regulated water).
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