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Histopathological changes in the gill of Dreissena polymorpha exposed to a new molluscicide were investigated. Ultrastructural examinations clearly demonstrated severe damage. The dilation of intercellular spaces concomitant with the vacuolation of epithelial cells led to progressive separation of the epithelium from the underlying chitinous rod. As a result, at the extremities of filaments, the chitinous rod remained free of cells. The ultimate change consisted of the complete destruction of gill tissues.
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Giambérini et al. (1996) studied this question.
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