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Comparative Studies on the Structural Changes in Some Kind of Snails During the Estivation and Trematoda Infection : 하안이 만손주혈흡충 중간숙주 Biomphalaria glabrata에 미치는 영향

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Lee, Soon-Hyung

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서울대학교 의과대학
Seoul J Med, Vol.17 No.2, pp. 143-156
This study was undertaken to elucidate 'the
changes and differences in Biomphalaria glabrata,
the most important snail host of Schistosoma
mansoni in Western Hemisphere,
during the process of estivation. The growth
rate (increase in shell diameter and wet weight),
survival rate and histopathology were
observed during the 22 weeks of experimental
period in comparison with the control snails.
Two groups of snails, each group consisted
of 36 snails, were used for the present experiment One group of snails was undergone
artificial estivation, and other group was
applied as normal control reared in the water.
The results obtained were as follows:
1. The growth rate of estivating snails
(Group n) was consistently lower than that
of control snails (Group I) kept in the water.
2. The growth rate rose rapidly when the
estivating snails were put into water again
after 12 weeks of estivation.
3. Survival rate of the estivating snails was
lower than that of their controls.
4. During the estivation, the reduction of
parenchyme and degenerative pictures were
prominently observed in the hepatopancreas,
ovotestes, seminal vesicle and saccular portion
of kidney. And little change was observed in
the rectal ridge and tubular portion of kidney
in the estivating snails.
5. After return of the estivating snails into
water, they almostly restored their normal • structures within 4 weeks.
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