The Implanation of the Glochidium On the Fish

Cover The Implanation of the Glochidium On the Fish
The Implanation of the Glochidium On the Fish
Daisy Young
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The time at which the tissue of the cyst becomes vacuol- ated varies according to the length of the parasitic period. In those infections which last fourteen days the intercellular spaces begin to appear about the fourth day, while in those extending over a period of thirty days the tissue assumes this appearance on the eighth or ninth day. As stated before, after the formation of these numerous lymph-spaces the cyst is much looser and weaker, and many glochidia which have not yet completed the
... metamorphosis fall off during this time. Parts of the cyst may become broken off as shown in fig. 7, but more often the tissue breaks below the point at which the parasite is attached and the glochidium falls to the bottom still surrounded by the wall of the cyst. This happens most often in the case of the larger hooked glochidia of Symphynota, but the lighter glochidia of Lampsilis may become separated from the fish in the same way. Although the glochidia are usually alive at the time they leave the fish and may often be seen to move slightly, the development does not continue and they soon die.

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