Abstract

ABSTRACT: The ultrastructural study of the relationship between Labratrema minimus metacercaria and the liver of juvenile grey mullet, Liza ramada , shows: (1) the laying down of three layers forming the cyst wall; (2) the evolution of the three layers constituting the fully developed cyst wall; and (3) the passing of lipid droplets through the inner layer from the nearest hepatocytes to the cyst cavity. Thus, the metacercarial cyst is of mixed origin, parasitic and hepatic. This cyst wall protects the parasite against possible reactions from the host. The solidification of the cyst wall by compaction involves the appearance of numerous desmosomes. Also, the wall permits passing of nutritive reserves that can be utilized by the parasite.

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