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A histo-cytological study was carried out on the effects of Labratrema minimus (Stossich, 1887) metacercariae (Trematoda, Bucephalidae) in the liver of the second intermediate hosts, grey mullet Liza ramada and silverside Atherina boyeri. The following features were seen at the interface between the fish and the parasite. (1) Formation of the initial layer constituting the cyst wall derived from the parasite and of the middle and outer layers, forming the capsular-like coat derived from the host liver. The hepatic origin of the latter 2 layers protects the parasite against a possible inflammatory reaction from the host, both in grey mullet and silverside. (2) Development of the 3 layers, defining both the cyst wall (initial) and the capsular-like coat (middle, outer), as a dynamic zone from the beginning of encystment until the seventh month after infection of juvenile grey mullet. (3) Accumulation of voluminous lipid droplets at an early stage (3 d post-infection) both in the metacercarial tegument and in the cyst cavity, and of a few such droplets within the cyst wall. (4) High level of infection and presence in the same parenchyma of various developmental stages of Labratrema minimus metacercaliae, demonstrating that in the lagoons the silverside is subject to multiple successive infections.

diseases of aquatic organisms

Ultrastructural study of the host-parasite interface after infection of two species of teleosts by Labratrema minimus metacercariae (Trematoda, Bucephalidae)