Emergence of cercariae of Echinostoma caproni and Schistosoma mansoni from Biomphalaria glabrata under different laboratory conditions

2002 ◽  
Vol 76 (4) ◽  
pp. 369-371 ◽  
Author(s):  
B. Fried ◽  
R. Laterra ◽  
Y. Kim
Keyword(s):  
Schistosoma Mansoni ◽  
Feeding Behaviour ◽  
Biomphalaria Glabrata ◽  
Spring Water ◽  
Echinostoma Caproni ◽  
Laboratory Conditions

AbstractRelease of Echinostoma caproni cercariae and Schistosoma mansoni from experimentally infected Biomphalaria glabrata snails maintained under different laboratory conditions was studied. Infected snails were isolated individually for 1 h in Stender dishes containing 5 ml of artificial spring water and the number of cercariae released during this time was recorded. Of numerous conditions tested, the addition of lettuce, the use of water conditioned by B. glabrata snails and a temperature of 35°C significantly increased the release of E. caproni cercariae. A significant increase in cercarial release of S. mansoni was seen only in cultures fed lettuce. A temperature of 12°C caused a significant decrease in cercarial release of both E. caproni and S. mansoni. Increased snail activity associated with feeding behaviour was probably responsible for the enhanced cercarial sheds observed in this study.

Cercarial tail loss in Echinostoma caproni: the influence of in vivo encystment and copper sulphate

2005 ◽  
Vol 79 (2) ◽  
pp. 177-178 ◽  
Author(s):  
B. Fried ◽  
J.L. Schneck
Keyword(s):  
Copper Sulphate ◽  
Biomphalaria Glabrata ◽  
Spring Water ◽  
Echinostoma Caproni ◽  
Tail Loss ◽  
Water Ph

AbstractEchinostoma caproni tail loss was studied in vitro in the presence of the toxicant copper sulphate (CuSO4) in concentrations ranging from 1 to 10 000 mg l?1 in standardized artificial spring water (pH 7.4, osmolarity 34 mOsm kg?1 H2O, Ca2+ 20 mg l?1) at 23°C. Tail loss was also studied in the absence of toxicants during in vivo encystment of the cercariae in juvenile Biomphalaria glabrata. As the concentration of CuSO4 increased, the percentage of cercarial tail loss increased. By 2 h in 10 000 mg l?1, 1000 mg l?1 and 100 mg l?1 CuSO4, 50%, 23% and 13%, respectively, of the cercariae had lost their tails. In the in vivo studies, by 1 h PI, 59±5% of cercariae had lost their tails and only 4±1% of the cercariae were actively swimming in the multi-well dishes. At 3 h PI, 72±3% of the cercariae began to form cysts within the snails.

scholarly journals Behavior of Biomphalaria glabrata, the intermediate host snail of Schistosoma mansoni, at different depths in water in laboratory conditions

1987 ◽  
Vol 82 (2) ◽  
pp. 197-208 ◽  
Author(s):  
P. Jurberg ◽  
V. T. Schall ◽  
J. V. Barbosa ◽  
M. J. Gatti ◽  
M. S. Soares
Keyword(s):  
Schistosoma Mansoni ◽  
Intermediate Host ◽  
Biomphalaria Glabrata ◽  
Food Control ◽  
Intermediate Host Snail ◽  
Host Snail ◽  
Laboratory Conditions ◽  
Different Depths ◽  
Experimental Group ◽  
As If

Using three columns of different depths (1.10m, 8.40m and 10.40m), we investigated the possibility of Biomphalaria glabrata moving towards deep regions. In the 1.10m column, we noted that locomotion can occur in two manners: 1) when the foot is in contact with the substrate: a) sliding descent; b) sliding ascent; c) creeping descent; d) creeping ascent, 2) when the foot is not in contact with the substrate: a) sudden descent without emission of air bules; b) sudden descent with emission of air bules; c) sudden ascent. In the 8.40m column containing food on the bottom (experimental group), the snails remained longer at this depth when compared to those of the group which received no food (control). The sliding behavior was characteristic of locomotion occurring at 0 to 1m both in upward and downward directions. Creeping behavior was typical for the ascent of the snails that reached deeper levels. When the snails were creeping, the shell remained hanging as if it were heavier, a fact that may have been due to water entering the pulmonary chamber. In the 10.40m column, the snails slid downward to a depth of 4m or descended suddenly all the way to the bottom. Ascent occurred by creeping from the bottom to the surface. In the 8.40m and 10.40m columns, copulation, feeding and oviposition occurred at the deepest levels.

Excretory–secretory proteome of larval Schistosoma mansoni and Echinostoma caproni, two parasites of Biomphalaria glabrata

2007 ◽  
Vol 155 (1) ◽  
pp. 45-56 ◽  
Author(s):  
François Guillou ◽  
Emmanuel Roger ◽  
Yves Moné ◽  
Anne Rognon ◽  
Christoph Grunau ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Biomphalaria Glabrata ◽  
Echinostoma Caproni
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